Relation of pump-beam quality and conversion efficiency in the Raman downward conversion |
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| Authors: | T T Lay S Wada H Tashiro K Toyoda |
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| Institution: | (1) The Institute of Physical and Chemical Research (RIKEN), 2-1 Hirosawa, Wako, 351-01 Saitama, Japan;(2) Present address: Graduate School of Science and Engineering, Saitama University, 225 Shimookubo, Urawa, 388 Saitama, Japan |
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| Abstract: | To investigate the full conversion of pump power to the Stokes waves in stimulated Raman scattering with a single-pass cell, unconverted pump energies have been analyzed in detail in relation to the first Stokes, second Stokes and first anti-Stokes energies. Adoption of a long focusing configuration with a high-pressure cell was found to be effective but insufficient to suppress the four-wave mixing effect, because a small amount of pump energy always remained undepleted. Comparison of the results using pump beams of various spectral and spatial mode characteristics from alexandrite and Nd:YAG lasers revealed that the spatial mode quality was the most critical parameter for full depletion of a pump pulse. |
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| Keywords: | 42 60 42 65 78 30 |
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