Abstract

Highly efficient energy conversion of the pump into the downshifted parametric Stokes radiation resulting from the phase-matched parametric four-photon mixing and subsequent perpendicular Raman amplification in a birefringent fiber is presented. We also observed significant polarization conversion from the fast y axis to the slow x axis of the birefringent fiber as a consequence of group-velocity-matched perpendicular Raman amplification of the x polarized parametric Stokes radiation by the y-polarized pump.

© 1989 Optical Society of America

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