16 August 2000 Raman conversion of a high-energy photolytically pumped I* laser
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Proceedings Volume 4065, High-Power Laser Ablation III; (2000) https://doi.org/10.1117/12.407388
Event: High-Power Laser Ablation, 2000, Santa Fe, NM, United States
Abstract
We have investigated rotational Raman conversion experiments in hydrogen using a single-shot photolytic iodine laser (PIL) at 1.315 micrometer as a pump laser. The total output energy of the PIL is between 5 - 7 J per pulse distributed in a train of approximately 120 pulses each with a FWHM of 6 or 9 nsec and a temporal spacing of 33 nsec. The energy distribution within the pulse train is characterized by high energy pulses in the gain switched spike followed by lower energy pulses in the tail of the laser pulse. Stimulated Raman scattering (SRS) experiments were performed with (1) a focused beam geometry in a single Raman cell, (2) two Raman cells, whereby the pump focus was reimaged into a second Raman cell, and (3) a Stokes resonator specifically suited for an annular pump beam. Thermal distortions in the laser beam made it necessary to lower the peak intensity of the pump laser beam by adjusting the focusing conditions. With a long focus mirror we demonstrated (1) a conversion efficiency of up to 70% for the high-energy pulses of the gain switched spike of the PIL micropulses and (2) lowering of the threshold with a Stokes resonator.
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Charles H. Fisher, Matthias P. Leuchs, Richard D. Romea, Andrew J.W. Brown, Marc Norsen, Ralph F. Tate, Melvin Harris, Gordon D. Hager, "Raman conversion of a high-energy photolytically pumped I* laser", Proc. SPIE 4065, High-Power Laser Ablation III, (16 August 2000); doi: 10.1117/12.407388; https://doi.org/10.1117/12.407388
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