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Raman Gain and Inverse Raman Effects on the Four-Photon Mixing Process in Optical Fibers

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When 532 mn light of the second harmonic wave from a pulsed YAG:Nd3+ laser was fed into an a-few-mode fiber, we observed several pairs of the Stokes and anti-Stokes radiations which have different LP modes but same frequency shift from the pumping light. These are generated by the four-photon mixing. This is confirmed by numerical check for the phase matching among the Stokes, anti-Stokes and pumping beams. As the shift increases, it was observed that the Stokes enhances, while the anti-Stokes becomes weak and disappears in a shift region over 250 cm−1 where the Raman gain becomes large. This is concluded to be caused by a competition between the four-photon mixing process and the stimulated Raman scattering process, resulting in the amplification of the Stokes by the stimulated Raman scattering while the absorption of the anti-Stokes by the inverse Raman effect.

© 1997 Optical Society of America

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