Mutlifrequency parametric Raman generation was carried out in a KGd(WO<sub>4</sub>)<sub>2</sub> crystal by use of a dual-wavelength Ti:sapphire laser system. It was found that with femtosecond pump pulses the efficiency of Raman generation is low because of the onset of self-phase modulation. The mechanism for suppression of stimulated Raman scattering by self-phase modulation is discussed. Employing 2-ps-long chirped pulses generated four Stokes and one anti-Stokes component.
© 2002 Optical Society of America
(190.4400) Nonlinear optics : Nonlinear optics, materials
(190.4410) Nonlinear optics : Nonlinear optics, parametric processes
(190.5650) Nonlinear optics : Raman effect
(320.7090) Ultrafast optics : Ultrafast lasers
(320.7110) Ultrafast optics : Ultrafast nonlinear optics
L. L. Losev, J. Song, J. F. Xia, D. Strickland, and V. V. Brukhanov, "Multifrequency parametric infrared Raman generation in KGd(WO4)2 crystal with biharmonic ultrashort-pulse pumping," Opt. Lett. 27, 2100-2102 (2002)