Raman backscattering (RBS) of a picosecond 800-nm laser pulse from a gas jet plasma has been observed. The frequency shifts are in agreement with independent interferometric density measurements and the band width of the RBS is consistent with the linear growth rate. Raman amplification of a subpicosecond seed pulse, provided by an optical parametric oscillator and tuned to the spectral range of the RBS, has been obtained. The Raman resonance is confirmed by simultaneous plasma density measurements.
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Geltner et al. (2003) studied this question.
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