Abstract

Concurrent Raman oscillation has been observed in periodically poled KTP nanosecond optical parametric oscillators in the near-infrared spectral region for certain domain periodicities. The increased Raman activity is associated with direct excitation of the phonon overtone band by the idler wave. The decrease in efficiency of stimulated Raman scattering at crystal temperature above 80°C is explained by higher dephasing rate of coherently driven lattice polarization due to interaction with thermally generated phonons.

© 2003 Optical Society of America

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