Abstract
Rotational Raman lines are generated by stimulated Raman scattering and four-wave Raman mixing using the fundamental (810 nm) and second harmonic emission (405 nm) of a Ti:sapphire laser. The intensity of the Raman emission, measured at the different wavelengths, were compared and confirmed to be more pronounced when a second harmonic emission is used as a pump beam. This is attributed to a larger Raman gain coefficient at shorter wavelengths and better beam quality obtained by the second harmonic generation, as predicted from theory.
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