Gs. He et al., DIFFERENCE OF SPECTRAL SUPERBROADENING BEHAVIOR IN KERR-TYPE AND NON-KERR-TYPE LIQUIDS PUMPED WITH ULTRASHORT LASER-PULSES, Applied optics, 32(24), 1993, pp. 4507-4512
The spectral superbroadening behavior of forward coherent radiation fr
om a lo-cm-long liquid-filled cell is investigated by using an ultrash
ort (approximately 0.5 ps) and intense (approximately 10 GW/cm2) laser
pulse as the pump source. Five different transparent liquids (heavy w
ater, water, carbon tetrachloride, benzene, and carbon disulfide) have
been studied with a special experimental design that can distinguish
the predominant contributions from the various possible mechanisms. Un
der the same pump condition, a very wide and symmetrical superbroadeni
ng (continuum) is observed on both the Stokes and the anti-Stokes side
of the pump line for non-Kerr-type liquids such as heavy water and wa
ter, whereas only a red-shifted spectral broadening can be observed on
the Stokes side for Kerr-type liquids such as carbon disulfide and be
nzene. For an explanation of the latter behavior, the dominant contrib
utions from stimulated Rayleigh-Kerr and Raman-Kerr scattering are pro
posed.