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Optica Publishing Group
  • International Quantum Electronics Conference
  • 1996 OSA Technical Digest Series (Optica Publishing Group, 1996),
  • paper FN1B

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Abstract

The experimental set-up consists of a heated sealed cell containing rubidium at 10−6 Torr pressure, in which two linearly-polarized overlapping beams copropagate. One of the beams, at frequency √1, from a Nd:YAG laser- pumped dye laser (5ns, 5Hz) is tuned over the 5s - nl two-photon transition with n = 14…19 and I = s,p and d. The second laser has a fixed frequency, √2, equal to 1.06μm. The directional forward output radiation is analyzed using a monocromator and appropriate filters to cut off the input beams. In the absence of the IR beam, we observe only the SH signal from s, p and d Rydberg states, which can be described by the third-order susceptibility, X(3), with a laser- induced static-electric field involved [1,2]. When the two beams are present, both SH and FWM signals can be observed by adjusting the monocromator to 300nm (SH frequency) or to 420nm (FWM frequency,√3 = 2 √1 - √2).

© 1996 Optical Society of America

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