We demonstrate efficient four-wave mixing in low-pressure molecular deuterium without the need for phase matching. We use two laser fields with opposite circular polarizations to produce a strong excitation of a rovibrational transition at a frequency of 3167 cm<sup>-1</sup> . The coherent molecular motion, in turn, modulates a third laser field (also circularly polarized) and results in highly efficient single-sideband conversion.
© 2001 Optical Society of America
(190.2620) Nonlinear optics : Harmonic generation and mixing
(190.5650) Nonlinear optics : Raman effect
(270.1670) Quantum optics : Coherent optical effects
(300.6270) Spectroscopy : Spectroscopy, far infrared
A. V. Sokolov, S. J. Sharpe, M. Shverdin, D. R. Walker, D. D. Yavuz, G. Y. Yin, and S. E. Harris, "Optical frequency conversion by a rotating molecular wave plate," Opt. Lett. 26, 728-730 (2001)