Abstract

We experimentally demonstrate the orbital angular momentum (OAM) conversion by the coupled nonlinear optical processes in a quasi-periodically poled LiTaO3 crystal. In such a crystal, third-harmonic generation (THG) is realized by the coupled second-harmonic generation (SHG) and sum-frequency generation (SFG) processes, i.e., SHG is dependent on SFG and vice versa. The OAMs of the interacting waves are proved to be conserved in such coupled nonlinear optical processes. As we increase the input OAM in the experiment, the conversion efficiency decreases because of the reduced fundamental power density. Our results provide better understanding for the OAM conversions, which can be used to efficiently produce an optical OAM state at a short wavelength.

© 2016 Optical Society of America

In 1992, Allen pointed out that the light beam with an azimuthal phase dependence of exp(ilφ) carries an orbital angular momentum (OAM), where l is the azimuthal mode index [1]. Such a beam can be experimentally produced in various ways such as Q-plate (QP) [2,3], spiral phase plates [4], holographic diffraction gratings [5], and segmented adaptive mirrors [6]. Significant attention has been focused on OAM because it can be widely used in optical tweezers [7,8], optical manipulation [9], optical trapping [10], imaging [11], and information processing [1216]. Recently, OAM beams have been applied in optical communication to increase the channel capacity and the spectral efficiency [17]. In practical applications, one often needs to imprint OAM onto a light beam with a short wavelength which however, is inconvenient to be realized through most of the traditional methods described above. Nonlinear optical conversion of an OAM state is an alternative and feasible way. Experimental demonstrations have been achieved in second-harmonic generation (SHG), sum-frequency generation (SFG), high-harmonic generation (HHG) [18], and spontaneous parametric downconversion (SPDC) [1921]. It is important to understand how the OAM evolves during nonlinear optical conversions. In 1996, Dholakia and co-workers reported the conservation law of OAM in an SHG process through the birefringent phase match (BPM) method [22,23]. Since then, the OAM conservation has been proved in most nonlinear optical interactions with a few exceptions in the SPDC processes.

Recently, periodically poled LiTaO3 (PPLT) crystals are used to realize OAM conversions [24,25]. PPLT crystals have been widely studied in the past decades because they can efficiently realize frequency conversion through the quasi-phase matching (QPM) technique [26]. Numerous interesting phenomena have been discovered in 1D and 2D PPLT crystals [2729]. Compared to the BPM method, QPM can greatly release the phase matching requirement by introducing reciprocal vectors. It can also utilize the largest nonlinear optical coefficients, for example, d33 in the LiTaO3 crystal. The theory of QPM OAM conversion is proposed by Shao et al. with the help of the coupled-wave equations [30]. The experiments have been carried out through SHG and SFG processes [24,31], which agree well with the OAM conservation. Interestingly, one can realize multiple copies of second-harmonic (SH) OAM states in a 2D PPLT crystal, which presents that the OAM conservation has certain tolerance for phase mismatch between the interacting waves [32]. However, it still remains undiscovered how an OAM state develops in coupled nonlinear optical conversions. In this Letter, we investigate the coupled OAM conversions through a QPM third-harmonic generation (THG) process in a quasi-periodically poled LiTaO3 (QPPLT) crystal.

An efficient THG [3335] can be achieved by cascading an SHG process and an SFG process. Usually, two PPLT crystals are required to compensate for the phase mismatches in SHG and the cascaded SFG, respectively [34]. However, in a single QPPLT crystal, the THG can be realized by coupling the SHG and SFG processes. The QPPLT crystal in our experiment is shown in Fig. 1(a). It consists of two fundamental blocks, A and B, arranged according to the Fibonacci sequence, i.e., ABAAB…, as shown in Fig. 1(b). WA and WB in Fig. 1(b) are the widths of A and B, respectively. Every block contains a pair of antiparallel 180° domains with WA=WA1+WA2 and WB=WB1+WB2. WA1=WB1=W for the positive domain of the sample, while WA2=W(1+η) and WB2=W(1τη) in the negative domain. Here, W, η and τ are adjustable structure parameters. The average structure parameter D is defined to be τWA+WB. The reciprocal vector in such a structure is defined by Gm,n=2πD1(m+nτ) with integrals m and n. In our experiment, W, η, and τ are mainly decided by the QPM conditions. To achieve high-efficiency conversion, the optimal value of the structure parameters can be calculated by using the coupled-wave equations [36]. The QPPLT structure can simultaneously fulfill the QPM THG condition which includes SHG and SFG processes [Fig. 1(c)]. Although the QPM configuration is similar to the THG case using two separate PPLT structures [34], the generations of SH and third-harmonic (TH) waves in a QPPLT crystal are coupled with each other, i.e., the SH wave is dependent on the TH wave and vice versa (see the coupled-wave equations in [36]). It is interesting to investigate the OAM conversion in such a system.

 

Fig. 1. (a) Microscopic photo of the QPPLT sample. (b) One segment of the structure. (c) Schematic QPM diagram of the THG process in the QPPLT crystal.

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The experimental setup is depicted in Fig. 2. The input fundamental field is generated by an optical parametric oscillator (Horizon I-8572, Continuum Co.) pumped by a nanosecond laser system with a pulse width of about 6 ns and a repetition rate of 10 Hz. The input wavelength is set at 1582 nm. To realize THG, the structure of the QPPLT crystal is designed to be WA=21.69  μm, WB=15.29  μm, and τ=5.076. The phase matching is achieved by involving G1,1 for the SHG process and G2,3 in the process of SFG [Fig. 1(c)]. In the experiment, we imprint OAM on the input fundamental beam with a QP. The QP used here is a half-wave plate fabricated by a birefringent liquid crystal with a space-variant optical axis in the transverse plane [2]. The geometry of the optical axis is defined by a topological charge “q” which is an integer or a semi-integer. When a circularly polarized light beam passes through such a QP, an OAM of 2q is transferred into the beam. In our experimental setup, the first quarter-wave plate (QWP) is used to change the linear polarization of the input laser to a circular polarization. After planting the OAM information through the QP, another QWP transforms the polarization of the generated vortex beam back to a linear polarization along the z axis (Fig. 2). Then, the fundamental wave with a known topological charge is focused on the QPPLT slice. Under the configuration, the involved nonlinear optical coefficient is d33, which is modulated in the QPPLT crystal. The obtained SH and TH patterns are collected by a CCD camera after filtering out the fundamental beam. A cylindrical lens is used as a mode converter to analyze the OAM information from the QPM THG pattern. By counting the dark stripes in the converted pattern, one can obtain the topological charge of the OAM state [37].

 

Fig. 2. Schematic of the experimental setup.

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The experimental images recorded on the CCD camera are shown in Fig. 3. First, the fundamental beam is imprinted with an OAM of l1=1. The observed SH and TH patterns are shown in Figs. 3(a) and 3(b), respectively. Both of them present ring-shaped intensity distributions. Then we convert the SH and TH OAM modes to Hermite–Gaussian modes by using a cylindrical lens, as shown in Figs. 3(c) and 3(d), respectively. By counting the dark stripes in the converted patterns, the topological charges of the generated SH and TH beams are l2=2 and l3=3, respectively. Obviously, the OAM conserves in such a QPM THG process, i.e., the coupled SHG and SFG processes with the aid of a QPPLT crystal. To further test the OAM conservation in the coupled nonlinear optical interactions, we change the input OAM to be l1=2 and l1=3, which produce TH OAM beams with l3=6 [Fig. 4(a)] and l3=9 [Fig. 4(b)], respectively. Our experimental results clearly show that the topological charge of the generated OAM mode scales with its harmonic number. The coupled nonlinear optical conversion of an OAM state follows the conservation law of

l2=2l1,l3=3l1.
Our results also indicate that the coupling between different nonlinear optical processes in an χ(2) modulated crystal does not break the OAM conservation law.

 

Fig. 3. (a) SH and (b) TH beams generated by a pump beam carrying an OAM of l1=1. By using a cylinder lens, the converted pattern indicates l2=2 for (c) the SH beam and l3=3 for (d) the TH beam.

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Fig. 4. (a) Interference patterns of THG generated by pump beam with l=2. (b) Interference pattern of THG generated by pump beam with l=3.

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The conversion efficiency of the input beam carrying different OAM is shown in Fig. 5(a). Obviously, the maximum conversion efficiencies are 33.3% for SHG and 8.2% for THG, which are achieved when no OAMs are imprinted. When the topological charge of the input OAM state increases, the conversion efficiency of SHG or THG clearly decreases. As shown in Fig. 5(a), 1.2%, 1%, and 0.5% conversion efficiency for THG and 24.5%, 22.5%, and 19.8% conversion efficiency for SHG are obtained in our experiment, which are correspond to an input l1=1, 2, and 3, respectively. This can be explained by the change in the fundamental power density after the introduction of OAM. In our experiment, an input OAM state with a higher topological charge has a ring-shaped intensity distribution with a bigger diameter, which results in a lower fundamental power density. Figure 5(b) shows the temperature tuning curves of the SHG and THG processes. The peak intensities of the SH and TH beams in our experiment can be achieved at 126 and 133 deg centigrade, respectively. The difference in the temperature may originate from the non-perfect dispersion law used to design the QPPLT structure, which indicates that the QPM conditions for SHG and SFG in Fig. 1(c) cannot be totally fulfilled at the same time. As a result, the OAM conversion is less efficient in the experiment. The conversion efficiency can be further improved after optimizing the structure parameter to fulfill the QPM conditions in the SHG and THG processes at the same temperature.

 

Fig. 5. (a) The conversion efficiencies of SHG and THG pumped by different OAM states. (b) Temperature tuning curves of SHG and THG.

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In conclusion, we experimentally demonstrate the coupled conversion of OAM from the THG process in the QPPLT crystal. The QPPLT structure provides the reciprocal vectors to simultaneously fulfill the QPM conditions in the coupled SHG and SFG processes for the efficient generation of a TH OAM beam. Collinear TH and SH beams with different OAMs are obtained in the experiment. Our experimental results prove that the OAM conserves in coupled nonlinear optical conversions. We also find that the conversion efficiency becomes smaller as we increase of the topological charge of the input OAM state because of the decreased fundamental power density. The Letter helps us better understand the OAM conversions in nonlinear optics, which has potential applications in the efficient generation of an OAM state at a short wavelength.

Funding

National Basic Research Program of China (2012CB921804); National Natural Science Foundation of China (NSFC) (11274162, 11274165, 11321063, 61490714); Priority Academic Program Development of Jiangsu Higher Education Institutions.

REFERENCES

1. L. Allen, M. W. Beijersbergen, R. J. C. Spreeuw, and J. P. Woerdman, Phys. Rev. A 45, 8185 (1992). [CrossRef]  

2. L. Marrucci, C. Manzo, and D. Paparo, Phys. Rev. Lett. 96, 163905 (2006). [CrossRef]  

3. P. Chen, W. Ji, B. Wei, W. Hu, V. Chigrinov, and Y. Q. Lu, Appl. Phys. Lett. 107, 241102 (2015). [CrossRef]  

4. M. W. Beijersbergen, R. P. C. Coerwinkel, M. Kristensen, and J. P. Wperdman, Opt. Commun. 112, 321 (1994). [CrossRef]  

5. N. R. Heckenberg, R. McDuff, C. P. Smith, and A. G. White, Opt. Lett. 17, 221 (1992). [CrossRef]  

6. R. K. Tyson, M. Scipioni, and J. Viegas, Appl. Opt. 47, 6300 (2008). [CrossRef]  

7. D. G. Grier, Nature 424, 810 (2003). [CrossRef]  

8. S. Tao, X. C. Yuan, J. Lin, X. Peng, and H. Niu, Opt. Express 13, 7726 (2005). [CrossRef]  

9. J. R. Collins and A. Stuart, J. Opt. Soc. Am. 60, 1168 (1970). [CrossRef]  

10. M. P. MacDonald, L. Paterson, K. Volke-Sepulveda, J. Arlt, W. Sibbett, and K. Dholakia, Science 296, 1101 (2002). [CrossRef]  

11. S. Barnet, A. Jesacher, S. Furhapter, C. Maurer, and M. Ritsch-Marte, Opt. Express 14, 3792 (2006). [CrossRef]  

12. A. Mair, A. Vaziri, G. Weihs, and A. Zeilinger, Nature 412, 313 (2001). [CrossRef]  

13. A. C. Dada, J. Leach, G. S. Buller, M. J. Padgett, and E. Andersson, Nat. Phys. 7, 677 (2011). [CrossRef]  

14. J. T. Barreiro, T. C. Wei, and P. G. B. Kwiat, Nat. Phys. 4, 282 (2008). [CrossRef]  

15. D. S. Ding, Z. Y. Zhou, B. S. Shi, and G. C. Guo, Nat. Commun. 4, 141 (2013).

16. G. Molina-Terriza, J. P. Torres, and L. Torner, Nat. Phys. 3, 305 (2007). [CrossRef]  

17. H. Huang, G. Xie, Y. Yan, N. Ahmed, Y. Ren, Y. Yue, D. Rogawski, M. J. Willner, B. I. Erkmen, K. M. Birnhaum, S. J. Dolinar, M. P. J. Lavery, M. J. Padgett, M. Tur, and A. E. Willner, Opt. Lett. 39, 197 (2014). [CrossRef]  

18. G. Gariepy, J. Leach, K. T. Kim, T. J. Hammond, E. Frumker, R. W. Boyd, and P. B. Corkum, Phys. Rev. Lett. 113, 153901 (2014). [CrossRef]  

19. J. Arlt, K. Dholakia, L. Allen, and M. J. Padgett, Phys. Rev. A 59, 3950 (1999). [CrossRef]  

20. S. Feng and P. Kumar, Phys. Rev. Lett. 101, 3958 (2008).

21. H. H. Arnaut and G. A. Barbosa, Phys. Rev. Lett. 85, 286 (2000). [CrossRef]  

22. K. Dholakia, N. B. Simpson, M. J. Padgett, and L. Allen, Phys. Rev. A 54, R3742 (1996). [CrossRef]  

23. J. Courtial, K. Dholakia, L. Allen, and M. J. Padgett, Phys. Rev. A 56, 4193 (1997). [CrossRef]  

24. Z. Y. Zhou, D. S. Ding, Y. K. Jiang, S. Shi, X. S. Wang, B. S. Shi, and G. C. Guo, Opt. Express 22, 20298 (2014). [CrossRef]  

25. S. M. Li, L. J. Kong, Z. C. Ren, Y. Li, C. Tu, and H. T. Wang, Phys. Rev. A 88, 035801 (2013). [CrossRef]  

26. X. P. Hu, X. Wang, J. L. He, Y. X. Fan, S. N. Zhu, H. T. Wang, Y. Y. Zhu, and N. B. Ming, Appl. Phys. Lett. 85, 188 (2004). [CrossRef]  

27. P. Xu, S. H. Ji, S. N. Zhu, X. Q. Yu, J. Sun, H. T. Wang, J. L. He, Y. Y. Zhu, and N. B. Ming, Phys. Rev. Lett. 93, 133904 (2004). [CrossRef]  

28. Y. Zhang, Z. D. Gao, Z. Qi, S. N. Zhu, and N. B. Ming, Phys. Rev. Lett. 100, 163904 (2008). [CrossRef]  

29. Y. Zhang, J. M. Wen, S. N. Zhu, and M. Xiao, Phys. Rev. Lett. 104, 183901 (2010). [CrossRef]  

30. G. H. Shao, Z. J. Wu, J. H. Chen, F. Xu, and Y. Q. Lu, Phys. Rev. A 88, 063827 (2013). [CrossRef]  

31. Y. Li, Z. Y. Zhou, D. S. Ding, and B. S. Shi, J. Opt. Soc. Am. B 32, 407 (2015). [CrossRef]  

32. X. Y. Fang, D. Z. Wei, D. M. Liu, W. H. Zhong, R. Ni, Z. H. Chen, X. P. Hu, Y. Zhang, S. N. Zhu, and M. Xiao, Appl. Phys. Lett. 107, 161102 (2015). [CrossRef]  

33. N. G. R. Broderick, G. W. Ross, H. L. Offerhaus, D. J. Richardson, and D. C. Hanna, Phys. Rev. Lett. 84, 4345 (2000). [CrossRef]  

34. X. P. Hu, G. Zhao, C. Zhang, Z. D. Xie, J. L. He, and S. N. Zhu, Appl. Phys. B 87, 91 (2007). [CrossRef]  

35. S. N. Zhu, Y. Y. Zhu, and N. B. Ming, Science 278, 843 (1997). [CrossRef]  

36. Y. Q. Qin, Y. Y. Zhu, S. N. Zhu, and N. B. Ming, J. Appl. Phys. 84, 6911 (1998). [CrossRef]  

37. V. Denisenko, V. Shvedov, A. S. Desyatnikov, D. N. Neshev, W. Krolikowski, A. Volyar, M. Sokin, and Y. S. Kivshar, Opt. Express 17, 23374 (2009). [CrossRef]  

References

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  • |
  • |

  1. L. Allen, M. W. Beijersbergen, R. J. C. Spreeuw, and J. P. Woerdman, Phys. Rev. A 45, 8185 (1992).
    [Crossref]
  2. L. Marrucci, C. Manzo, and D. Paparo, Phys. Rev. Lett. 96, 163905 (2006).
    [Crossref]
  3. P. Chen, W. Ji, B. Wei, W. Hu, V. Chigrinov, and Y. Q. Lu, Appl. Phys. Lett. 107, 241102 (2015).
    [Crossref]
  4. M. W. Beijersbergen, R. P. C. Coerwinkel, M. Kristensen, and J. P. Wperdman, Opt. Commun. 112, 321 (1994).
    [Crossref]
  5. N. R. Heckenberg, R. McDuff, C. P. Smith, and A. G. White, Opt. Lett. 17, 221 (1992).
    [Crossref]
  6. R. K. Tyson, M. Scipioni, and J. Viegas, Appl. Opt. 47, 6300 (2008).
    [Crossref]
  7. D. G. Grier, Nature 424, 810 (2003).
    [Crossref]
  8. S. Tao, X. C. Yuan, J. Lin, X. Peng, and H. Niu, Opt. Express 13, 7726 (2005).
    [Crossref]
  9. J. R. Collins and A. Stuart, J. Opt. Soc. Am. 60, 1168 (1970).
    [Crossref]
  10. M. P. MacDonald, L. Paterson, K. Volke-Sepulveda, J. Arlt, W. Sibbett, and K. Dholakia, Science 296, 1101 (2002).
    [Crossref]
  11. S. Barnet, A. Jesacher, S. Furhapter, C. Maurer, and M. Ritsch-Marte, Opt. Express 14, 3792 (2006).
    [Crossref]
  12. A. Mair, A. Vaziri, G. Weihs, and A. Zeilinger, Nature 412, 313 (2001).
    [Crossref]
  13. A. C. Dada, J. Leach, G. S. Buller, M. J. Padgett, and E. Andersson, Nat. Phys. 7, 677 (2011).
    [Crossref]
  14. J. T. Barreiro, T. C. Wei, and P. G. B. Kwiat, Nat. Phys. 4, 282 (2008).
    [Crossref]
  15. D. S. Ding, Z. Y. Zhou, B. S. Shi, and G. C. Guo, Nat. Commun. 4, 141 (2013).
  16. G. Molina-Terriza, J. P. Torres, and L. Torner, Nat. Phys. 3, 305 (2007).
    [Crossref]
  17. H. Huang, G. Xie, Y. Yan, N. Ahmed, Y. Ren, Y. Yue, D. Rogawski, M. J. Willner, B. I. Erkmen, K. M. Birnhaum, S. J. Dolinar, M. P. J. Lavery, M. J. Padgett, M. Tur, and A. E. Willner, Opt. Lett. 39, 197 (2014).
    [Crossref]
  18. G. Gariepy, J. Leach, K. T. Kim, T. J. Hammond, E. Frumker, R. W. Boyd, and P. B. Corkum, Phys. Rev. Lett. 113, 153901 (2014).
    [Crossref]
  19. J. Arlt, K. Dholakia, L. Allen, and M. J. Padgett, Phys. Rev. A 59, 3950 (1999).
    [Crossref]
  20. S. Feng and P. Kumar, Phys. Rev. Lett. 101, 3958 (2008).
  21. H. H. Arnaut and G. A. Barbosa, Phys. Rev. Lett. 85, 286 (2000).
    [Crossref]
  22. K. Dholakia, N. B. Simpson, M. J. Padgett, and L. Allen, Phys. Rev. A 54, R3742 (1996).
    [Crossref]
  23. J. Courtial, K. Dholakia, L. Allen, and M. J. Padgett, Phys. Rev. A 56, 4193 (1997).
    [Crossref]
  24. Z. Y. Zhou, D. S. Ding, Y. K. Jiang, S. Shi, X. S. Wang, B. S. Shi, and G. C. Guo, Opt. Express 22, 20298 (2014).
    [Crossref]
  25. S. M. Li, L. J. Kong, Z. C. Ren, Y. Li, C. Tu, and H. T. Wang, Phys. Rev. A 88, 035801 (2013).
    [Crossref]
  26. X. P. Hu, X. Wang, J. L. He, Y. X. Fan, S. N. Zhu, H. T. Wang, Y. Y. Zhu, and N. B. Ming, Appl. Phys. Lett. 85, 188 (2004).
    [Crossref]
  27. P. Xu, S. H. Ji, S. N. Zhu, X. Q. Yu, J. Sun, H. T. Wang, J. L. He, Y. Y. Zhu, and N. B. Ming, Phys. Rev. Lett. 93, 133904 (2004).
    [Crossref]
  28. Y. Zhang, Z. D. Gao, Z. Qi, S. N. Zhu, and N. B. Ming, Phys. Rev. Lett. 100, 163904 (2008).
    [Crossref]
  29. Y. Zhang, J. M. Wen, S. N. Zhu, and M. Xiao, Phys. Rev. Lett. 104, 183901 (2010).
    [Crossref]
  30. G. H. Shao, Z. J. Wu, J. H. Chen, F. Xu, and Y. Q. Lu, Phys. Rev. A 88, 063827 (2013).
    [Crossref]
  31. Y. Li, Z. Y. Zhou, D. S. Ding, and B. S. Shi, J. Opt. Soc. Am. B 32, 407 (2015).
    [Crossref]
  32. X. Y. Fang, D. Z. Wei, D. M. Liu, W. H. Zhong, R. Ni, Z. H. Chen, X. P. Hu, Y. Zhang, S. N. Zhu, and M. Xiao, Appl. Phys. Lett. 107, 161102 (2015).
    [Crossref]
  33. N. G. R. Broderick, G. W. Ross, H. L. Offerhaus, D. J. Richardson, and D. C. Hanna, Phys. Rev. Lett. 84, 4345 (2000).
    [Crossref]
  34. X. P. Hu, G. Zhao, C. Zhang, Z. D. Xie, J. L. He, and S. N. Zhu, Appl. Phys. B 87, 91 (2007).
    [Crossref]
  35. S. N. Zhu, Y. Y. Zhu, and N. B. Ming, Science 278, 843 (1997).
    [Crossref]
  36. Y. Q. Qin, Y. Y. Zhu, S. N. Zhu, and N. B. Ming, J. Appl. Phys. 84, 6911 (1998).
    [Crossref]
  37. V. Denisenko, V. Shvedov, A. S. Desyatnikov, D. N. Neshev, W. Krolikowski, A. Volyar, M. Sokin, and Y. S. Kivshar, Opt. Express 17, 23374 (2009).
    [Crossref]

2015 (3)

P. Chen, W. Ji, B. Wei, W. Hu, V. Chigrinov, and Y. Q. Lu, Appl. Phys. Lett. 107, 241102 (2015).
[Crossref]

Y. Li, Z. Y. Zhou, D. S. Ding, and B. S. Shi, J. Opt. Soc. Am. B 32, 407 (2015).
[Crossref]

X. Y. Fang, D. Z. Wei, D. M. Liu, W. H. Zhong, R. Ni, Z. H. Chen, X. P. Hu, Y. Zhang, S. N. Zhu, and M. Xiao, Appl. Phys. Lett. 107, 161102 (2015).
[Crossref]

2014 (3)

2013 (3)

D. S. Ding, Z. Y. Zhou, B. S. Shi, and G. C. Guo, Nat. Commun. 4, 141 (2013).

S. M. Li, L. J. Kong, Z. C. Ren, Y. Li, C. Tu, and H. T. Wang, Phys. Rev. A 88, 035801 (2013).
[Crossref]

G. H. Shao, Z. J. Wu, J. H. Chen, F. Xu, and Y. Q. Lu, Phys. Rev. A 88, 063827 (2013).
[Crossref]

2011 (1)

A. C. Dada, J. Leach, G. S. Buller, M. J. Padgett, and E. Andersson, Nat. Phys. 7, 677 (2011).
[Crossref]

2010 (1)

Y. Zhang, J. M. Wen, S. N. Zhu, and M. Xiao, Phys. Rev. Lett. 104, 183901 (2010).
[Crossref]

2009 (1)

2008 (4)

Y. Zhang, Z. D. Gao, Z. Qi, S. N. Zhu, and N. B. Ming, Phys. Rev. Lett. 100, 163904 (2008).
[Crossref]

S. Feng and P. Kumar, Phys. Rev. Lett. 101, 3958 (2008).

J. T. Barreiro, T. C. Wei, and P. G. B. Kwiat, Nat. Phys. 4, 282 (2008).
[Crossref]

R. K. Tyson, M. Scipioni, and J. Viegas, Appl. Opt. 47, 6300 (2008).
[Crossref]

2007 (2)

G. Molina-Terriza, J. P. Torres, and L. Torner, Nat. Phys. 3, 305 (2007).
[Crossref]

X. P. Hu, G. Zhao, C. Zhang, Z. D. Xie, J. L. He, and S. N. Zhu, Appl. Phys. B 87, 91 (2007).
[Crossref]

2006 (2)

2005 (1)

2004 (2)

X. P. Hu, X. Wang, J. L. He, Y. X. Fan, S. N. Zhu, H. T. Wang, Y. Y. Zhu, and N. B. Ming, Appl. Phys. Lett. 85, 188 (2004).
[Crossref]

P. Xu, S. H. Ji, S. N. Zhu, X. Q. Yu, J. Sun, H. T. Wang, J. L. He, Y. Y. Zhu, and N. B. Ming, Phys. Rev. Lett. 93, 133904 (2004).
[Crossref]

2003 (1)

D. G. Grier, Nature 424, 810 (2003).
[Crossref]

2002 (1)

M. P. MacDonald, L. Paterson, K. Volke-Sepulveda, J. Arlt, W. Sibbett, and K. Dholakia, Science 296, 1101 (2002).
[Crossref]

2001 (1)

A. Mair, A. Vaziri, G. Weihs, and A. Zeilinger, Nature 412, 313 (2001).
[Crossref]

2000 (2)

H. H. Arnaut and G. A. Barbosa, Phys. Rev. Lett. 85, 286 (2000).
[Crossref]

N. G. R. Broderick, G. W. Ross, H. L. Offerhaus, D. J. Richardson, and D. C. Hanna, Phys. Rev. Lett. 84, 4345 (2000).
[Crossref]

1999 (1)

J. Arlt, K. Dholakia, L. Allen, and M. J. Padgett, Phys. Rev. A 59, 3950 (1999).
[Crossref]

1998 (1)

Y. Q. Qin, Y. Y. Zhu, S. N. Zhu, and N. B. Ming, J. Appl. Phys. 84, 6911 (1998).
[Crossref]

1997 (2)

S. N. Zhu, Y. Y. Zhu, and N. B. Ming, Science 278, 843 (1997).
[Crossref]

J. Courtial, K. Dholakia, L. Allen, and M. J. Padgett, Phys. Rev. A 56, 4193 (1997).
[Crossref]

1996 (1)

K. Dholakia, N. B. Simpson, M. J. Padgett, and L. Allen, Phys. Rev. A 54, R3742 (1996).
[Crossref]

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Figures (5)

Fig. 1.
Fig. 1. (a) Microscopic photo of the QPPLT sample. (b) One segment of the structure. (c) Schematic QPM diagram of the THG process in the QPPLT crystal.
Fig. 2.
Fig. 2. Schematic of the experimental setup.
Fig. 3.
Fig. 3. (a) SH and (b) TH beams generated by a pump beam carrying an OAM of l 1 = 1 . By using a cylinder lens, the converted pattern indicates l 2 = 2 for (c) the SH beam and l 3 = 3 for (d) the TH beam.
Fig. 4.
Fig. 4. (a) Interference patterns of THG generated by pump beam with l = 2 . (b) Interference pattern of THG generated by pump beam with l = 3 .
Fig. 5.
Fig. 5. (a) The conversion efficiencies of SHG and THG pumped by different OAM states. (b) Temperature tuning curves of SHG and THG.

Equations (1)

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l 2 = 2 l 1 , l 3 = 3 l 1 .

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