Ai. Vodchitz et al., CORRELATIONS BETWEEN THE INTENSITIES OF PUMP, DEPLETED PUMP AND STOKES WAVES IN SUPERBROADBAND STIMULATED RAMAN-SCATTERING, Optics communications, 125(4-6), 1996, pp. 243-249
The pair correlations between the intensities of input pump laser radi
ation with spectral bandwidth of 250 cm(-1), which has femtosecond and
picosecond noise structures, output depleted pump radiation and Stoke
s light generated through stimulated Raman scattering (SRS)in compress
ed hydrogen have been studied experimentally under weak and strong pum
p depletion. The third order correlation functions were measured by me
ans of time-delayed four-wave mixing in a Kerr-shutter scheme with two
noise light beams under investigation. The data obtained show that th
e Stokes wave is well correlated with the input pump wave up to an ene
rgy conversion efficiency of about 30%. The measured functions display
the considerable suppression of the femtosecond amplitude fluctuation
s in the depleted pump beam upon increasing the efficiency of SRS and
pump depletion. Such a result shows a possible way for preparing super
broadband light with smooth temporal envelope and predominant phase fl
uctuations using SRS. The picosecond part of the correlations between
the depleted pump and Stokes waves is characterized by the asymmetrica
l shape that is probably caused by the fact that picosecond peaks in t
he noise structure of the depleted pump and Stokes waves have opposite
temporal profiles.