C. Yu, H. X. He, Y. H. Wang, Q. Shi, Y. D. Zhang, and R. F. Lu, “Intense attosecond pulse generated from a molecular harmonic plateau of H2+ in mid-infrared laser fields,” J. Phys. B 47, 055601 (2014).

[Crossref]

W. H. Xiong, J. W. Geng, J. Y. Tang, L. Y. Peng, and Q. H. Gong, “Mechanisms of below-threshold harmonic generation in atoms,” Phys. Rev. Lett. 112, 233001 (2014).

[Crossref]
[PubMed]

S. J. Yu, B. Zhang, Y. P. Li, S. P. Yang, and Y. J. Chen, “Ellipticity of odd-even harmonics from oriented asymmetric molecules in strong linearly polarized laser fields,” Phys. Rev. A 90, 053844 (2014).

[Crossref]

J. Henkel, T. Witting, D. Fabris, M. Lein, P. L. Knight, J. W. G. Tisch, and J. P. Marangos, “Prediction of attosecond light pulses in the VUV range in a high-order-harmonic-generation regime,” Phys. Rev. A 87, 043818 (2013).

[Crossref]

Y. J. Chen and B. Zhang, “Strong-field approximations for the orientation dependence of the total ionization of homonuclear diatomic molecules with different internuclear distances,” J. Phys. B 45, 215601 (2012).

[Crossref]

J. C. Liu, M. C. Kohler, C. H. Keitel, and K. Z. Hatsagortsyan, “Coherent x-ray generation from below-threshold harmonics,” Phys. Rev. A 84, 063817 (2011).

[Crossref]

V. V. Strelkov, A. A. Gonoskov, I. A. Gonoskov, and M. Yu. Ryabikin, “Origin for ellipticity of high-order harmonics generated in atomic gases and the sublaser-cycle evolution of harmonic polarization,” Phys. Rev. Lett. 107, 043902 (2011).

[Crossref]
[PubMed]

P. A. J. Sherratt, S. Ramakrishna, and T. Seideman, “Signatures of the molecular potential in the ellipticity of high-order harmonics from aligned molecules,” Phys. Rev. A 83, 053425 (2011).

[Crossref]

S. K. Son, D. A. Telnov, and S. I. Chu, “Probing the origin of elliptical high-order harmonic generation from aligned molecules in linearly polarized laser fields,” Phys. Rev. A 82, 043829 (2010).

[Crossref]

A. Etches, C. B. Madsen, and L. B. Madsen, “Inducing elliptically polarized high-order harmonics from aligned molecules with linearly polarized femtosecond pulses,” Phys. Rev. A 81, 013409 (2010).

[Crossref]

S. Ramakrishna, P. A. J. Sherratt, A. D. Dutoi, and T. Seideman, “Origin and implication of ellipticity in high-order harmonic generation from aligned molecules,” Phys. Rev. A 81, 021802(R) (2010).

[Crossref]

E. P. Power, A. M. March, F. Catoire, E. Sistrunk, K. Krushelnick, P. Agostini, and L. F. DiMauro, “XFROG phase measurement of threshold harmonics in a Keldysh-scaled system,” Nat. Photonics 4, 352–356 (2010).

[Crossref]

H. Soifer, P. Botheron, D. Shafir, A. Diner, O. Raz, B. D. Bruner, Y. Mairesse, B. Pons, and N. Dudovich, “Nearthreshold high-order harmonic spectroscopy with aligned molecules,” Phys. Rev. Lett. 105, 143904 (2010).

[Crossref]

J. A. Hostetter, J. L. Tate, K. J. Schafer, and M. B. Gaarde, “Semiclassical approaches to below-threshold harmonics,” Phys. Rev. A 82, 023401 (2010).

[Crossref]

J. J. Carrera and S. I. Chu, “Ab initio time-dependent density-functional-theory study of the frequency comb structure, coherence, and dephasing of multielectron systems in the vuv-xuv regimes via high-order harmonic generation,” Phys. Rev. A 79, 063410 (2009).

[Crossref]

X. Zhou, R. Lock, N. Wagner, W. Li, H. C. Kapteyn, and M. M. Murnane, “Elliptically polarized high-order harmonic emission from molecules in linearly polarized laser fields,” Phys. Rev. Lett. 102, 073902 (2009).

[Crossref]
[PubMed]

O. Smirnova, S. Patchkovskii, Y. Mairesse, N. Dudovich, D. Villeneuve, P. B. Corkum, and M. Yu. Ivanov, “Attosecond circular dichroism spectroscopy of polyatomic molecules,” Phys. Rev. Lett. 102, 063601 (2009).

[Crossref]
[PubMed]

D. C. Yost, T. R. Schibli, J. Ye, J. L. Tate, J. Hostetter, M. B. Gaarde, and K. J. Schafer, “Vacuum-ultraviolet frequency combs from below-threshold harmonics,” Nat. Phys. 5, 815–820 (2009).

[Crossref]

F. Krausz and M. Ivanov, “Attosecond physics,” Rev. Mod. Phys. 81, 163–234 (2009).

[Crossref]

S. Sukiasyan, C. McDonald, C. Destefani, M. Y. Ivanov, and T. Brabec, “Multielectron correlation in high-harmonic generation: A 2D model analysis,” Phys. Rev. Lett. 102, 223002 (2009).

[Crossref]
[PubMed]

J. J. Carrera, S. K. Son, and S. I. Chu, “Ab initio theoretical investigation of the frequency comb structure and coherence in the vuv-xuv regimes via high-order harmonic generation,” Phys. Rev. A 77, 031401 (2008).

[Crossref]

P. B. Corkum and F. Krausz, “Attosecond science,” Nat. Phys. 3, 381–387 (2007).

[Crossref]

J. Chen and S. G. Chen, “Gauge problem in molecular high-order harmonic generation,” Phys. Rev. A 75, 041402(R) (2007).

[Crossref]

Y. J. Chen, J. Chen, and J. Liu, “Charge-resonance effect on harmonic generation by symmetric diatomic molecular ions in intense laser fields,” Phys. Rev. A 74, 063405 (2006).

[Crossref]

C. Gohle, T. Udem, M. Herrmann, J. Rauschenberger, R. Holzwarth, H. A. Schuessler, F. Krausz, and T. W. Hansch, “A frequency comb in the extreme ultraviolet,” Nature (London) 436, 234–237 (2005).

[Crossref]

R. J. Jones, K. D. Moll, M. J. Thorpe, and J. Ye, “Phase-coherent frequency combs in the vacuum ultraviolet via high-harmonic generation inside a femtosecond enhancement cavity,” Phys. Rev. Lett. 94, 193201 (2005).

[Crossref]
[PubMed]

P. Agostini and L. F. DiMauro, “The physics of attosecond light pulses,” Rep. Prog. Phys. 67, 813–855 (2004).

[Crossref]

I. V. Litvinyuk, K. F. Lee, P. W. Dooley, D. M. Rayner, D. M. Villeneuve, and P. B. Corkum, “Alignment-dependent strong field ionization of molecules,” Phys. Rev. Lett. 90, 233003 (2003).

[Crossref]
[PubMed]

M. Lein, N. Hay, R. Velotta, J. P. Marangos, and P. L. Knight, “Role of the intramolecular phase in high-harmonic generation,” Phys. Rev. Lett. 88, 183903 (2002).

[Crossref]
[PubMed]

R. Velotta, N. Hay, M. B. Mason, M. Castillejo, and J. P. Marangos, “High-order harmonic generation in aligned molecules,” Phys. Rev. Lett. 87, 183901 (2001).

[Crossref]

X. M. Tong and S. I. Chu, “Probing the spectral and temporal structures of high-order harmonic generation in intense laser pulses,” Phys. Rev. A 61, 021802(R) (2000).

[Crossref]

A. D. Bandrauk and J. Ruel, “Charge-resonance-enhanced ionization of molecular ions in intense laser pulses: Geometric and orientation effects,” Phys. Rev. A 59, 2153–2162 (1999).

[Crossref]

M. Kakehata, H. Takada, H. Yumoto, and K. Miyazaki, “Anomalous ellipticity dependence of high-order harmonic generation,” Phys. Rev. A 55, R861–R864 (1997).

[Crossref]

M. Y. Ivanov, T. Brabec, and N. Burnett, “Coulomb corrections and polarization effects in high-intensity high-harmonic emission,” Phys. Rev. A 54, 742–745 (1996).

[Crossref]
[PubMed]

P. Antoine, A. L. Huillier, and M. Lewenstein, “Attosecond pulse trains using high-order harmonics,” Phys. Rev. Lett. 77, 1234–1237 (1996).

[Crossref]
[PubMed]

N. H. Burnett, C. Kan, and P. B. Corkum, “Ellipticity and polarization effects in harmonic generation in ionizing neon,” Phys. Rev. A 51, R3418–R3421 (1995).

[Crossref]
[PubMed]

K. Miyazaki and H. Takada, “High-order harmonic generation in the tunneling regime,” Phys. Rev. A 52, 3007–3021 (1995).

[Crossref]
[PubMed]

T. Zuo and A. D. Bandrauk, “Charge-resonance-enhanced ionization of diatomic molecular ions by intense lasers,” Phys. Rev. A 52, R2511–R2514 (1995).

[Crossref]
[PubMed]

M. Lewenstein, Ph. Balcou, M. Yu. Ivanov, A. L’Huillier, and P. B. Corkum, “Theory of high-harmonic generation by low-frequency laser fields,” Phys. Rev. A 49, 2117–2132 (1994).

[Crossref]
[PubMed]

P. B. Corkum, “Plasma perspective on strong field multiphoton ionization,” Phys. Rev. Lett. 71, 1994–1997 (1993).

[Crossref]
[PubMed]

T. Zuo, S. Chelkowski, and A. D. Bandrauk, “Harmonic generation by the H2+ molecular ion in intense laser fields,” Phys. Rev. A 48, 3837–3844 (1993).

[Crossref]
[PubMed]

M. Yu. Ivanov and P. B. Corkum, “Generation of high-order harmonics from inertially confined molecular ions,” Phys. Rev. A 48, 580–590 (1993).

[Crossref]
[PubMed]

M. Yu. Ivanov, P. B. Corkum, and P. Dietrich, “Coherent control and collapse of symmetry in a two-level system in an intense laser field,” Laser Phys. 3, 375–380 (1993).

A. L’Huillier, K. J. Schafer, and K. C. Kulander, “Theoretical aspects of intense field harmonic generation,” J. Phys. B 24, 3315–3341 (1991).

[Crossref]

A. McPherson, G. Gibson, H. Jara, U. Johann, T. S. Luk, I. A. McIntyre, K. Boyer, and C. K. Rhodes, “Studies of multiphoton production of vacuum-ultraviolet radiation in the rare gases,” J. Opt. Soc. Am. B 4, 595–601 (1987).

[Crossref]

M. D. Feit, J. A. Fleck, and A. Steiger, “Solution of the Schrödinger equation by a spectral method,” J. Comput. Phys. 47, 412–433 (1982).

[Crossref]

E. P. Power, A. M. March, F. Catoire, E. Sistrunk, K. Krushelnick, P. Agostini, and L. F. DiMauro, “XFROG phase measurement of threshold harmonics in a Keldysh-scaled system,” Nat. Photonics 4, 352–356 (2010).

[Crossref]

P. Agostini and L. F. DiMauro, “The physics of attosecond light pulses,” Rep. Prog. Phys. 67, 813–855 (2004).

[Crossref]

P. Antoine, A. L. Huillier, and M. Lewenstein, “Attosecond pulse trains using high-order harmonics,” Phys. Rev. Lett. 77, 1234–1237 (1996).

[Crossref]
[PubMed]

M. Lewenstein, Ph. Balcou, M. Yu. Ivanov, A. L’Huillier, and P. B. Corkum, “Theory of high-harmonic generation by low-frequency laser fields,” Phys. Rev. A 49, 2117–2132 (1994).

[Crossref]
[PubMed]

A. D. Bandrauk and J. Ruel, “Charge-resonance-enhanced ionization of molecular ions in intense laser pulses: Geometric and orientation effects,” Phys. Rev. A 59, 2153–2162 (1999).

[Crossref]

T. Zuo and A. D. Bandrauk, “Charge-resonance-enhanced ionization of diatomic molecular ions by intense lasers,” Phys. Rev. A 52, R2511–R2514 (1995).

[Crossref]
[PubMed]

T. Zuo, S. Chelkowski, and A. D. Bandrauk, “Harmonic generation by the H2+ molecular ion in intense laser fields,” Phys. Rev. A 48, 3837–3844 (1993).

[Crossref]
[PubMed]

H. Soifer, P. Botheron, D. Shafir, A. Diner, O. Raz, B. D. Bruner, Y. Mairesse, B. Pons, and N. Dudovich, “Nearthreshold high-order harmonic spectroscopy with aligned molecules,” Phys. Rev. Lett. 105, 143904 (2010).

[Crossref]

A. McPherson, G. Gibson, H. Jara, U. Johann, T. S. Luk, I. A. McIntyre, K. Boyer, and C. K. Rhodes, “Studies of multiphoton production of vacuum-ultraviolet radiation in the rare gases,” J. Opt. Soc. Am. B 4, 595–601 (1987).

[Crossref]

S. Sukiasyan, C. McDonald, C. Destefani, M. Y. Ivanov, and T. Brabec, “Multielectron correlation in high-harmonic generation: A 2D model analysis,” Phys. Rev. Lett. 102, 223002 (2009).

[Crossref]
[PubMed]

M. Y. Ivanov, T. Brabec, and N. Burnett, “Coulomb corrections and polarization effects in high-intensity high-harmonic emission,” Phys. Rev. A 54, 742–745 (1996).

[Crossref]
[PubMed]

H. Soifer, P. Botheron, D. Shafir, A. Diner, O. Raz, B. D. Bruner, Y. Mairesse, B. Pons, and N. Dudovich, “Nearthreshold high-order harmonic spectroscopy with aligned molecules,” Phys. Rev. Lett. 105, 143904 (2010).

[Crossref]

M. Y. Ivanov, T. Brabec, and N. Burnett, “Coulomb corrections and polarization effects in high-intensity high-harmonic emission,” Phys. Rev. A 54, 742–745 (1996).

[Crossref]
[PubMed]

N. H. Burnett, C. Kan, and P. B. Corkum, “Ellipticity and polarization effects in harmonic generation in ionizing neon,” Phys. Rev. A 51, R3418–R3421 (1995).

[Crossref]
[PubMed]

J. J. Carrera and S. I. Chu, “Ab initio time-dependent density-functional-theory study of the frequency comb structure, coherence, and dephasing of multielectron systems in the vuv-xuv regimes via high-order harmonic generation,” Phys. Rev. A 79, 063410 (2009).

[Crossref]

J. J. Carrera, S. K. Son, and S. I. Chu, “Ab initio theoretical investigation of the frequency comb structure and coherence in the vuv-xuv regimes via high-order harmonic generation,” Phys. Rev. A 77, 031401 (2008).

[Crossref]

R. Velotta, N. Hay, M. B. Mason, M. Castillejo, and J. P. Marangos, “High-order harmonic generation in aligned molecules,” Phys. Rev. Lett. 87, 183901 (2001).

[Crossref]

E. P. Power, A. M. March, F. Catoire, E. Sistrunk, K. Krushelnick, P. Agostini, and L. F. DiMauro, “XFROG phase measurement of threshold harmonics in a Keldysh-scaled system,” Nat. Photonics 4, 352–356 (2010).

[Crossref]

T. Zuo, S. Chelkowski, and A. D. Bandrauk, “Harmonic generation by the H2+ molecular ion in intense laser fields,” Phys. Rev. A 48, 3837–3844 (1993).

[Crossref]
[PubMed]

J. Chen and S. G. Chen, “Gauge problem in molecular high-order harmonic generation,” Phys. Rev. A 75, 041402(R) (2007).

[Crossref]

Y. J. Chen, J. Chen, and J. Liu, “Charge-resonance effect on harmonic generation by symmetric diatomic molecular ions in intense laser fields,” Phys. Rev. A 74, 063405 (2006).

[Crossref]

J. Chen and S. G. Chen, “Gauge problem in molecular high-order harmonic generation,” Phys. Rev. A 75, 041402(R) (2007).

[Crossref]

F. L. Dong, Y. Q. Tian, S. J. Yu, S. Wang, S. P. Yang, and Y. J. Chen, “Polarization properties of below-threshold harmonics from aligned molecules H2+ in linearly polarized laser fields,” Opt. Express 23, 18106–18116 (2015).

[Crossref]
[PubMed]

S. J. Yu, B. Zhang, Y. P. Li, S. P. Yang, and Y. J. Chen, “Ellipticity of odd-even harmonics from oriented asymmetric molecules in strong linearly polarized laser fields,” Phys. Rev. A 90, 053844 (2014).

[Crossref]

Y. J. Chen and B. Zhang, “Strong-field approximations for the orientation dependence of the total ionization of homonuclear diatomic molecules with different internuclear distances,” J. Phys. B 45, 215601 (2012).

[Crossref]

Y. J. Chen, J. Chen, and J. Liu, “Charge-resonance effect on harmonic generation by symmetric diatomic molecular ions in intense laser fields,” Phys. Rev. A 74, 063405 (2006).

[Crossref]

S. K. Son, D. A. Telnov, and S. I. Chu, “Probing the origin of elliptical high-order harmonic generation from aligned molecules in linearly polarized laser fields,” Phys. Rev. A 82, 043829 (2010).

[Crossref]

J. J. Carrera and S. I. Chu, “Ab initio time-dependent density-functional-theory study of the frequency comb structure, coherence, and dephasing of multielectron systems in the vuv-xuv regimes via high-order harmonic generation,” Phys. Rev. A 79, 063410 (2009).

[Crossref]

J. J. Carrera, S. K. Son, and S. I. Chu, “Ab initio theoretical investigation of the frequency comb structure and coherence in the vuv-xuv regimes via high-order harmonic generation,” Phys. Rev. A 77, 031401 (2008).

[Crossref]

X. M. Tong and S. I. Chu, “Probing the spectral and temporal structures of high-order harmonic generation in intense laser pulses,” Phys. Rev. A 61, 021802(R) (2000).

[Crossref]

O. Smirnova, S. Patchkovskii, Y. Mairesse, N. Dudovich, D. Villeneuve, P. B. Corkum, and M. Yu. Ivanov, “Attosecond circular dichroism spectroscopy of polyatomic molecules,” Phys. Rev. Lett. 102, 063601 (2009).

[Crossref]
[PubMed]

P. B. Corkum and F. Krausz, “Attosecond science,” Nat. Phys. 3, 381–387 (2007).

[Crossref]

I. V. Litvinyuk, K. F. Lee, P. W. Dooley, D. M. Rayner, D. M. Villeneuve, and P. B. Corkum, “Alignment-dependent strong field ionization of molecules,” Phys. Rev. Lett. 90, 233003 (2003).

[Crossref]
[PubMed]

N. H. Burnett, C. Kan, and P. B. Corkum, “Ellipticity and polarization effects in harmonic generation in ionizing neon,” Phys. Rev. A 51, R3418–R3421 (1995).

[Crossref]
[PubMed]

M. Lewenstein, Ph. Balcou, M. Yu. Ivanov, A. L’Huillier, and P. B. Corkum, “Theory of high-harmonic generation by low-frequency laser fields,” Phys. Rev. A 49, 2117–2132 (1994).

[Crossref]
[PubMed]

P. B. Corkum, “Plasma perspective on strong field multiphoton ionization,” Phys. Rev. Lett. 71, 1994–1997 (1993).

[Crossref]
[PubMed]

M. Yu. Ivanov, P. B. Corkum, and P. Dietrich, “Coherent control and collapse of symmetry in a two-level system in an intense laser field,” Laser Phys. 3, 375–380 (1993).

M. Yu. Ivanov and P. B. Corkum, “Generation of high-order harmonics from inertially confined molecular ions,” Phys. Rev. A 48, 580–590 (1993).

[Crossref]
[PubMed]

S. Sukiasyan, C. McDonald, C. Destefani, M. Y. Ivanov, and T. Brabec, “Multielectron correlation in high-harmonic generation: A 2D model analysis,” Phys. Rev. Lett. 102, 223002 (2009).

[Crossref]
[PubMed]

M. Yu. Ivanov, P. B. Corkum, and P. Dietrich, “Coherent control and collapse of symmetry in a two-level system in an intense laser field,” Laser Phys. 3, 375–380 (1993).

E. P. Power, A. M. March, F. Catoire, E. Sistrunk, K. Krushelnick, P. Agostini, and L. F. DiMauro, “XFROG phase measurement of threshold harmonics in a Keldysh-scaled system,” Nat. Photonics 4, 352–356 (2010).

[Crossref]

P. Agostini and L. F. DiMauro, “The physics of attosecond light pulses,” Rep. Prog. Phys. 67, 813–855 (2004).

[Crossref]

H. Soifer, P. Botheron, D. Shafir, A. Diner, O. Raz, B. D. Bruner, Y. Mairesse, B. Pons, and N. Dudovich, “Nearthreshold high-order harmonic spectroscopy with aligned molecules,” Phys. Rev. Lett. 105, 143904 (2010).

[Crossref]

I. V. Litvinyuk, K. F. Lee, P. W. Dooley, D. M. Rayner, D. M. Villeneuve, and P. B. Corkum, “Alignment-dependent strong field ionization of molecules,” Phys. Rev. Lett. 90, 233003 (2003).

[Crossref]
[PubMed]

H. Soifer, P. Botheron, D. Shafir, A. Diner, O. Raz, B. D. Bruner, Y. Mairesse, B. Pons, and N. Dudovich, “Nearthreshold high-order harmonic spectroscopy with aligned molecules,” Phys. Rev. Lett. 105, 143904 (2010).

[Crossref]

O. Smirnova, S. Patchkovskii, Y. Mairesse, N. Dudovich, D. Villeneuve, P. B. Corkum, and M. Yu. Ivanov, “Attosecond circular dichroism spectroscopy of polyatomic molecules,” Phys. Rev. Lett. 102, 063601 (2009).

[Crossref]
[PubMed]

S. Ramakrishna, P. A. J. Sherratt, A. D. Dutoi, and T. Seideman, “Origin and implication of ellipticity in high-order harmonic generation from aligned molecules,” Phys. Rev. A 81, 021802(R) (2010).

[Crossref]

A. Etches, C. B. Madsen, and L. B. Madsen, “Inducing elliptically polarized high-order harmonics from aligned molecules with linearly polarized femtosecond pulses,” Phys. Rev. A 81, 013409 (2010).

[Crossref]

J. Henkel, T. Witting, D. Fabris, M. Lein, P. L. Knight, J. W. G. Tisch, and J. P. Marangos, “Prediction of attosecond light pulses in the VUV range in a high-order-harmonic-generation regime,” Phys. Rev. A 87, 043818 (2013).

[Crossref]

M. D. Feit, J. A. Fleck, and A. Steiger, “Solution of the Schrödinger equation by a spectral method,” J. Comput. Phys. 47, 412–433 (1982).

[Crossref]

M. D. Feit, J. A. Fleck, and A. Steiger, “Solution of the Schrödinger equation by a spectral method,” J. Comput. Phys. 47, 412–433 (1982).

[Crossref]

J. A. Hostetter, J. L. Tate, K. J. Schafer, and M. B. Gaarde, “Semiclassical approaches to below-threshold harmonics,” Phys. Rev. A 82, 023401 (2010).

[Crossref]

D. C. Yost, T. R. Schibli, J. Ye, J. L. Tate, J. Hostetter, M. B. Gaarde, and K. J. Schafer, “Vacuum-ultraviolet frequency combs from below-threshold harmonics,” Nat. Phys. 5, 815–820 (2009).

[Crossref]

W. H. Xiong, J. W. Geng, J. Y. Tang, L. Y. Peng, and Q. H. Gong, “Mechanisms of below-threshold harmonic generation in atoms,” Phys. Rev. Lett. 112, 233001 (2014).

[Crossref]
[PubMed]

A. McPherson, G. Gibson, H. Jara, U. Johann, T. S. Luk, I. A. McIntyre, K. Boyer, and C. K. Rhodes, “Studies of multiphoton production of vacuum-ultraviolet radiation in the rare gases,” J. Opt. Soc. Am. B 4, 595–601 (1987).

[Crossref]

C. Gohle, T. Udem, M. Herrmann, J. Rauschenberger, R. Holzwarth, H. A. Schuessler, F. Krausz, and T. W. Hansch, “A frequency comb in the extreme ultraviolet,” Nature (London) 436, 234–237 (2005).

[Crossref]

W. H. Xiong, J. W. Geng, J. Y. Tang, L. Y. Peng, and Q. H. Gong, “Mechanisms of below-threshold harmonic generation in atoms,” Phys. Rev. Lett. 112, 233001 (2014).

[Crossref]
[PubMed]

V. V. Strelkov, A. A. Gonoskov, I. A. Gonoskov, and M. Yu. Ryabikin, “Origin for ellipticity of high-order harmonics generated in atomic gases and the sublaser-cycle evolution of harmonic polarization,” Phys. Rev. Lett. 107, 043902 (2011).

[Crossref]
[PubMed]

V. V. Strelkov, A. A. Gonoskov, I. A. Gonoskov, and M. Yu. Ryabikin, “Origin for ellipticity of high-order harmonics generated in atomic gases and the sublaser-cycle evolution of harmonic polarization,” Phys. Rev. Lett. 107, 043902 (2011).

[Crossref]
[PubMed]

C. Gohle, T. Udem, M. Herrmann, J. Rauschenberger, R. Holzwarth, H. A. Schuessler, F. Krausz, and T. W. Hansch, “A frequency comb in the extreme ultraviolet,” Nature (London) 436, 234–237 (2005).

[Crossref]

J. C. Liu, M. C. Kohler, C. H. Keitel, and K. Z. Hatsagortsyan, “Coherent x-ray generation from below-threshold harmonics,” Phys. Rev. A 84, 063817 (2011).

[Crossref]

M. Lein, N. Hay, R. Velotta, J. P. Marangos, and P. L. Knight, “Role of the intramolecular phase in high-harmonic generation,” Phys. Rev. Lett. 88, 183903 (2002).

[Crossref]
[PubMed]

R. Velotta, N. Hay, M. B. Mason, M. Castillejo, and J. P. Marangos, “High-order harmonic generation in aligned molecules,” Phys. Rev. Lett. 87, 183901 (2001).

[Crossref]

C. Yu, H. X. He, Y. H. Wang, Q. Shi, Y. D. Zhang, and R. F. Lu, “Intense attosecond pulse generated from a molecular harmonic plateau of H2+ in mid-infrared laser fields,” J. Phys. B 47, 055601 (2014).

[Crossref]

J. Henkel, T. Witting, D. Fabris, M. Lein, P. L. Knight, J. W. G. Tisch, and J. P. Marangos, “Prediction of attosecond light pulses in the VUV range in a high-order-harmonic-generation regime,” Phys. Rev. A 87, 043818 (2013).

[Crossref]

C. Gohle, T. Udem, M. Herrmann, J. Rauschenberger, R. Holzwarth, H. A. Schuessler, F. Krausz, and T. W. Hansch, “A frequency comb in the extreme ultraviolet,” Nature (London) 436, 234–237 (2005).

[Crossref]

C. Gohle, T. Udem, M. Herrmann, J. Rauschenberger, R. Holzwarth, H. A. Schuessler, F. Krausz, and T. W. Hansch, “A frequency comb in the extreme ultraviolet,” Nature (London) 436, 234–237 (2005).

[Crossref]

D. C. Yost, T. R. Schibli, J. Ye, J. L. Tate, J. Hostetter, M. B. Gaarde, and K. J. Schafer, “Vacuum-ultraviolet frequency combs from below-threshold harmonics,” Nat. Phys. 5, 815–820 (2009).

[Crossref]

J. A. Hostetter, J. L. Tate, K. J. Schafer, and M. B. Gaarde, “Semiclassical approaches to below-threshold harmonics,” Phys. Rev. A 82, 023401 (2010).

[Crossref]

P. Antoine, A. L. Huillier, and M. Lewenstein, “Attosecond pulse trains using high-order harmonics,” Phys. Rev. Lett. 77, 1234–1237 (1996).

[Crossref]
[PubMed]

F. Krausz and M. Ivanov, “Attosecond physics,” Rev. Mod. Phys. 81, 163–234 (2009).

[Crossref]

S. Sukiasyan, C. McDonald, C. Destefani, M. Y. Ivanov, and T. Brabec, “Multielectron correlation in high-harmonic generation: A 2D model analysis,” Phys. Rev. Lett. 102, 223002 (2009).

[Crossref]
[PubMed]

M. Y. Ivanov, T. Brabec, and N. Burnett, “Coulomb corrections and polarization effects in high-intensity high-harmonic emission,” Phys. Rev. A 54, 742–745 (1996).

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[Crossref]
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[Crossref]
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[Crossref]

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[Crossref]
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[Crossref]

A. McPherson, G. Gibson, H. Jara, U. Johann, T. S. Luk, I. A. McIntyre, K. Boyer, and C. K. Rhodes, “Studies of multiphoton production of vacuum-ultraviolet radiation in the rare gases,” J. Opt. Soc. Am. B 4, 595–601 (1987).

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[Crossref]

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[Crossref]
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[Crossref]

M. Lein, N. Hay, R. Velotta, J. P. Marangos, and P. L. Knight, “Role of the intramolecular phase in high-harmonic generation,” Phys. Rev. Lett. 88, 183903 (2002).

[Crossref]
[PubMed]

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[Crossref]

E. P. Power, A. M. March, F. Catoire, E. Sistrunk, K. Krushelnick, P. Agostini, and L. F. DiMauro, “XFROG phase measurement of threshold harmonics in a Keldysh-scaled system,” Nat. Photonics 4, 352–356 (2010).

[Crossref]

R. Velotta, N. Hay, M. B. Mason, M. Castillejo, and J. P. Marangos, “High-order harmonic generation in aligned molecules,” Phys. Rev. Lett. 87, 183901 (2001).

[Crossref]

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[Crossref]
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A. McPherson, G. Gibson, H. Jara, U. Johann, T. S. Luk, I. A. McIntyre, K. Boyer, and C. K. Rhodes, “Studies of multiphoton production of vacuum-ultraviolet radiation in the rare gases,” J. Opt. Soc. Am. B 4, 595–601 (1987).

[Crossref]

A. McPherson, G. Gibson, H. Jara, U. Johann, T. S. Luk, I. A. McIntyre, K. Boyer, and C. K. Rhodes, “Studies of multiphoton production of vacuum-ultraviolet radiation in the rare gases,” J. Opt. Soc. Am. B 4, 595–601 (1987).

[Crossref]

M. Kakehata, H. Takada, H. Yumoto, and K. Miyazaki, “Anomalous ellipticity dependence of high-order harmonic generation,” Phys. Rev. A 55, R861–R864 (1997).

[Crossref]

K. Miyazaki and H. Takada, “High-order harmonic generation in the tunneling regime,” Phys. Rev. A 52, 3007–3021 (1995).

[Crossref]
[PubMed]

R. J. Jones, K. D. Moll, M. J. Thorpe, and J. Ye, “Phase-coherent frequency combs in the vacuum ultraviolet via high-harmonic generation inside a femtosecond enhancement cavity,” Phys. Rev. Lett. 94, 193201 (2005).

[Crossref]
[PubMed]

X. Zhou, R. Lock, N. Wagner, W. Li, H. C. Kapteyn, and M. M. Murnane, “Elliptically polarized high-order harmonic emission from molecules in linearly polarized laser fields,” Phys. Rev. Lett. 102, 073902 (2009).

[Crossref]
[PubMed]

O. Smirnova, S. Patchkovskii, Y. Mairesse, N. Dudovich, D. Villeneuve, P. B. Corkum, and M. Yu. Ivanov, “Attosecond circular dichroism spectroscopy of polyatomic molecules,” Phys. Rev. Lett. 102, 063601 (2009).

[Crossref]
[PubMed]

W. H. Xiong, J. W. Geng, J. Y. Tang, L. Y. Peng, and Q. H. Gong, “Mechanisms of below-threshold harmonic generation in atoms,” Phys. Rev. Lett. 112, 233001 (2014).

[Crossref]
[PubMed]

H. Soifer, P. Botheron, D. Shafir, A. Diner, O. Raz, B. D. Bruner, Y. Mairesse, B. Pons, and N. Dudovich, “Nearthreshold high-order harmonic spectroscopy with aligned molecules,” Phys. Rev. Lett. 105, 143904 (2010).

[Crossref]

E. P. Power, A. M. March, F. Catoire, E. Sistrunk, K. Krushelnick, P. Agostini, and L. F. DiMauro, “XFROG phase measurement of threshold harmonics in a Keldysh-scaled system,” Nat. Photonics 4, 352–356 (2010).

[Crossref]

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S. Ramakrishna, P. A. J. Sherratt, A. D. Dutoi, and T. Seideman, “Origin and implication of ellipticity in high-order harmonic generation from aligned molecules,” Phys. Rev. A 81, 021802(R) (2010).

[Crossref]

C. Gohle, T. Udem, M. Herrmann, J. Rauschenberger, R. Holzwarth, H. A. Schuessler, F. Krausz, and T. W. Hansch, “A frequency comb in the extreme ultraviolet,” Nature (London) 436, 234–237 (2005).

[Crossref]

I. V. Litvinyuk, K. F. Lee, P. W. Dooley, D. M. Rayner, D. M. Villeneuve, and P. B. Corkum, “Alignment-dependent strong field ionization of molecules,” Phys. Rev. Lett. 90, 233003 (2003).

[Crossref]
[PubMed]

H. Soifer, P. Botheron, D. Shafir, A. Diner, O. Raz, B. D. Bruner, Y. Mairesse, B. Pons, and N. Dudovich, “Nearthreshold high-order harmonic spectroscopy with aligned molecules,” Phys. Rev. Lett. 105, 143904 (2010).

[Crossref]

A. McPherson, G. Gibson, H. Jara, U. Johann, T. S. Luk, I. A. McIntyre, K. Boyer, and C. K. Rhodes, “Studies of multiphoton production of vacuum-ultraviolet radiation in the rare gases,” J. Opt. Soc. Am. B 4, 595–601 (1987).

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J. A. Hostetter, J. L. Tate, K. J. Schafer, and M. B. Gaarde, “Semiclassical approaches to below-threshold harmonics,” Phys. Rev. A 82, 023401 (2010).

[Crossref]

D. C. Yost, T. R. Schibli, J. Ye, J. L. Tate, J. Hostetter, M. B. Gaarde, and K. J. Schafer, “Vacuum-ultraviolet frequency combs from below-threshold harmonics,” Nat. Phys. 5, 815–820 (2009).

[Crossref]

A. L’Huillier, K. J. Schafer, and K. C. Kulander, “Theoretical aspects of intense field harmonic generation,” J. Phys. B 24, 3315–3341 (1991).

[Crossref]

D. C. Yost, T. R. Schibli, J. Ye, J. L. Tate, J. Hostetter, M. B. Gaarde, and K. J. Schafer, “Vacuum-ultraviolet frequency combs from below-threshold harmonics,” Nat. Phys. 5, 815–820 (2009).

[Crossref]

C. Gohle, T. Udem, M. Herrmann, J. Rauschenberger, R. Holzwarth, H. A. Schuessler, F. Krausz, and T. W. Hansch, “A frequency comb in the extreme ultraviolet,” Nature (London) 436, 234–237 (2005).

[Crossref]

P. A. J. Sherratt, S. Ramakrishna, and T. Seideman, “Signatures of the molecular potential in the ellipticity of high-order harmonics from aligned molecules,” Phys. Rev. A 83, 053425 (2011).

[Crossref]

S. Ramakrishna, P. A. J. Sherratt, A. D. Dutoi, and T. Seideman, “Origin and implication of ellipticity in high-order harmonic generation from aligned molecules,” Phys. Rev. A 81, 021802(R) (2010).

[Crossref]

H. Soifer, P. Botheron, D. Shafir, A. Diner, O. Raz, B. D. Bruner, Y. Mairesse, B. Pons, and N. Dudovich, “Nearthreshold high-order harmonic spectroscopy with aligned molecules,” Phys. Rev. Lett. 105, 143904 (2010).

[Crossref]

P. A. J. Sherratt, S. Ramakrishna, and T. Seideman, “Signatures of the molecular potential in the ellipticity of high-order harmonics from aligned molecules,” Phys. Rev. A 83, 053425 (2011).

[Crossref]

S. Ramakrishna, P. A. J. Sherratt, A. D. Dutoi, and T. Seideman, “Origin and implication of ellipticity in high-order harmonic generation from aligned molecules,” Phys. Rev. A 81, 021802(R) (2010).

[Crossref]

C. Yu, H. X. He, Y. H. Wang, Q. Shi, Y. D. Zhang, and R. F. Lu, “Intense attosecond pulse generated from a molecular harmonic plateau of H2+ in mid-infrared laser fields,” J. Phys. B 47, 055601 (2014).

[Crossref]

E. P. Power, A. M. March, F. Catoire, E. Sistrunk, K. Krushelnick, P. Agostini, and L. F. DiMauro, “XFROG phase measurement of threshold harmonics in a Keldysh-scaled system,” Nat. Photonics 4, 352–356 (2010).

[Crossref]

O. Smirnova, S. Patchkovskii, Y. Mairesse, N. Dudovich, D. Villeneuve, P. B. Corkum, and M. Yu. Ivanov, “Attosecond circular dichroism spectroscopy of polyatomic molecules,” Phys. Rev. Lett. 102, 063601 (2009).

[Crossref]
[PubMed]

H. Soifer, P. Botheron, D. Shafir, A. Diner, O. Raz, B. D. Bruner, Y. Mairesse, B. Pons, and N. Dudovich, “Nearthreshold high-order harmonic spectroscopy with aligned molecules,” Phys. Rev. Lett. 105, 143904 (2010).

[Crossref]

S. K. Son, D. A. Telnov, and S. I. Chu, “Probing the origin of elliptical high-order harmonic generation from aligned molecules in linearly polarized laser fields,” Phys. Rev. A 82, 043829 (2010).

[Crossref]

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[Crossref]
[PubMed]

S. Sukiasyan, C. McDonald, C. Destefani, M. Y. Ivanov, and T. Brabec, “Multielectron correlation in high-harmonic generation: A 2D model analysis,” Phys. Rev. Lett. 102, 223002 (2009).

[Crossref]
[PubMed]

M. Kakehata, H. Takada, H. Yumoto, and K. Miyazaki, “Anomalous ellipticity dependence of high-order harmonic generation,” Phys. Rev. A 55, R861–R864 (1997).

[Crossref]

K. Miyazaki and H. Takada, “High-order harmonic generation in the tunneling regime,” Phys. Rev. A 52, 3007–3021 (1995).

[Crossref]
[PubMed]

W. H. Xiong, J. W. Geng, J. Y. Tang, L. Y. Peng, and Q. H. Gong, “Mechanisms of below-threshold harmonic generation in atoms,” Phys. Rev. Lett. 112, 233001 (2014).

[Crossref]
[PubMed]

J. A. Hostetter, J. L. Tate, K. J. Schafer, and M. B. Gaarde, “Semiclassical approaches to below-threshold harmonics,” Phys. Rev. A 82, 023401 (2010).

[Crossref]

D. C. Yost, T. R. Schibli, J. Ye, J. L. Tate, J. Hostetter, M. B. Gaarde, and K. J. Schafer, “Vacuum-ultraviolet frequency combs from below-threshold harmonics,” Nat. Phys. 5, 815–820 (2009).

[Crossref]

S. K. Son, D. A. Telnov, and S. I. Chu, “Probing the origin of elliptical high-order harmonic generation from aligned molecules in linearly polarized laser fields,” Phys. Rev. A 82, 043829 (2010).

[Crossref]

R. J. Jones, K. D. Moll, M. J. Thorpe, and J. Ye, “Phase-coherent frequency combs in the vacuum ultraviolet via high-harmonic generation inside a femtosecond enhancement cavity,” Phys. Rev. Lett. 94, 193201 (2005).

[Crossref]
[PubMed]

J. Henkel, T. Witting, D. Fabris, M. Lein, P. L. Knight, J. W. G. Tisch, and J. P. Marangos, “Prediction of attosecond light pulses in the VUV range in a high-order-harmonic-generation regime,” Phys. Rev. A 87, 043818 (2013).

[Crossref]

X. M. Tong and S. I. Chu, “Probing the spectral and temporal structures of high-order harmonic generation in intense laser pulses,” Phys. Rev. A 61, 021802(R) (2000).

[Crossref]

C. Gohle, T. Udem, M. Herrmann, J. Rauschenberger, R. Holzwarth, H. A. Schuessler, F. Krausz, and T. W. Hansch, “A frequency comb in the extreme ultraviolet,” Nature (London) 436, 234–237 (2005).

[Crossref]

M. Lein, N. Hay, R. Velotta, J. P. Marangos, and P. L. Knight, “Role of the intramolecular phase in high-harmonic generation,” Phys. Rev. Lett. 88, 183903 (2002).

[Crossref]
[PubMed]

R. Velotta, N. Hay, M. B. Mason, M. Castillejo, and J. P. Marangos, “High-order harmonic generation in aligned molecules,” Phys. Rev. Lett. 87, 183901 (2001).

[Crossref]

O. Smirnova, S. Patchkovskii, Y. Mairesse, N. Dudovich, D. Villeneuve, P. B. Corkum, and M. Yu. Ivanov, “Attosecond circular dichroism spectroscopy of polyatomic molecules,” Phys. Rev. Lett. 102, 063601 (2009).

[Crossref]
[PubMed]

I. V. Litvinyuk, K. F. Lee, P. W. Dooley, D. M. Rayner, D. M. Villeneuve, and P. B. Corkum, “Alignment-dependent strong field ionization of molecules,” Phys. Rev. Lett. 90, 233003 (2003).

[Crossref]
[PubMed]

X. Zhou, R. Lock, N. Wagner, W. Li, H. C. Kapteyn, and M. M. Murnane, “Elliptically polarized high-order harmonic emission from molecules in linearly polarized laser fields,” Phys. Rev. Lett. 102, 073902 (2009).

[Crossref]
[PubMed]

C. Yu, H. X. He, Y. H. Wang, Q. Shi, Y. D. Zhang, and R. F. Lu, “Intense attosecond pulse generated from a molecular harmonic plateau of H2+ in mid-infrared laser fields,” J. Phys. B 47, 055601 (2014).

[Crossref]

J. Henkel, T. Witting, D. Fabris, M. Lein, P. L. Knight, J. W. G. Tisch, and J. P. Marangos, “Prediction of attosecond light pulses in the VUV range in a high-order-harmonic-generation regime,” Phys. Rev. A 87, 043818 (2013).

[Crossref]

W. H. Xiong, J. W. Geng, J. Y. Tang, L. Y. Peng, and Q. H. Gong, “Mechanisms of below-threshold harmonic generation in atoms,” Phys. Rev. Lett. 112, 233001 (2014).

[Crossref]
[PubMed]

F. L. Dong, Y. Q. Tian, S. J. Yu, S. Wang, S. P. Yang, and Y. J. Chen, “Polarization properties of below-threshold harmonics from aligned molecules H2+ in linearly polarized laser fields,” Opt. Express 23, 18106–18116 (2015).

[Crossref]
[PubMed]

S. J. Yu, B. Zhang, Y. P. Li, S. P. Yang, and Y. J. Chen, “Ellipticity of odd-even harmonics from oriented asymmetric molecules in strong linearly polarized laser fields,” Phys. Rev. A 90, 053844 (2014).

[Crossref]

D. C. Yost, T. R. Schibli, J. Ye, J. L. Tate, J. Hostetter, M. B. Gaarde, and K. J. Schafer, “Vacuum-ultraviolet frequency combs from below-threshold harmonics,” Nat. Phys. 5, 815–820 (2009).

[Crossref]

R. J. Jones, K. D. Moll, M. J. Thorpe, and J. Ye, “Phase-coherent frequency combs in the vacuum ultraviolet via high-harmonic generation inside a femtosecond enhancement cavity,” Phys. Rev. Lett. 94, 193201 (2005).

[Crossref]
[PubMed]

D. C. Yost, T. R. Schibli, J. Ye, J. L. Tate, J. Hostetter, M. B. Gaarde, and K. J. Schafer, “Vacuum-ultraviolet frequency combs from below-threshold harmonics,” Nat. Phys. 5, 815–820 (2009).

[Crossref]

C. Yu, H. X. He, Y. H. Wang, Q. Shi, Y. D. Zhang, and R. F. Lu, “Intense attosecond pulse generated from a molecular harmonic plateau of H2+ in mid-infrared laser fields,” J. Phys. B 47, 055601 (2014).

[Crossref]

F. L. Dong, Y. Q. Tian, S. J. Yu, S. Wang, S. P. Yang, and Y. J. Chen, “Polarization properties of below-threshold harmonics from aligned molecules H2+ in linearly polarized laser fields,” Opt. Express 23, 18106–18116 (2015).

[Crossref]
[PubMed]

S. J. Yu, B. Zhang, Y. P. Li, S. P. Yang, and Y. J. Chen, “Ellipticity of odd-even harmonics from oriented asymmetric molecules in strong linearly polarized laser fields,” Phys. Rev. A 90, 053844 (2014).

[Crossref]

M. Kakehata, H. Takada, H. Yumoto, and K. Miyazaki, “Anomalous ellipticity dependence of high-order harmonic generation,” Phys. Rev. A 55, R861–R864 (1997).

[Crossref]

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