Abstract
The spectral changes of stimulated Raman scattering (SRS) from a micrometer-sized sinusoidally modulated water jet (radius, ∼14.5µm) have been observed. The pumping pulses of a frequency-doubled Q-switched Nd:YAG laser were synchronized to the modulation wave on the water jet. Before conducting SRS experiments, we measured the modulation amplitudes of the water jet from the diffraction patterns. The spectral changes of SRS exhibited the peak's shifts, the narrowing down of the SRS spectral range, and the reduction of the SRS peak. From the estimation of the mode orders of the SRS peaks with the cylinder modes, we found that the cylinder modes are not sufficient to explain the observed SRS peaks at small modulation amplitude, which are thought to be caused by the appearance of new modes in the modulated jet. We have interpreted the spectral changes as the reduction of the effective quality factor in the modulated cylinder.
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