Stimulated Brillouin Scattering In Carbon Disulfide At 1315 nm For Pulse Lengths In The Microsecond Regime

Roger L Facklam; Ronald R Bousek

doi:10.1117/12.951727

8 August 1989 Stimulated Brillouin Scattering In Carbon Disulfide At 1315 nm For Pulse Lengths In The Microsecond Regime

Roger L Facklam, Ronald R Bousek

Author Affiliations +

Proceedings Volume 1060, Nonlinear Optical Beam Manipulation and High Energy Beam Propagation Through the Atmosphere; (1989) https://doi.org/10.1117/12.951727
Event: OE/LASE '89, 1989, Los Angeles, CA, United States

Abstract

The laser source for this set of experiments was a photolytically pumped iodine laser. The pulse had an energy of 5 joules and a time duration on the order of 100 microseconds. The pulse shape generally consisted of two primary parts: the first peak of approximately 10 microseconds followed by a 20 microsecond period and a final large peak of 40 microseconds full width at half maximum. The other predominant feature was relaxation oscillations. High speed detectors were set up with transient digitizers that monitored the pump laser power, throughput laser power, and SBS return power. The SBS medium was carbon disulfide. The laser beam was focused into the medium and then recollected on the throughput side. SBS was observed for all portions of the pulse above threshold and for continuous periods as long as 40 microseconds. There were two new effects observed in this set of experiments. The first is a decay tail several microseconds long present in the return SBS after the pump signal had dropped below SBS threshold. Secondly, the SBS threshold appears to be correlated with the laser power as a function of time during the pulse. The observed effects are attributed to the additional presence of Stimulated Thermal Brillouin Scattering (STBS) on the basis of qualitative arguments. There was no evidence for forward SBS as a competing process.

Citation Download Citation

Roger L Facklam and Ronald R Bousek "Stimulated Brillouin Scattering In Carbon Disulfide At 1315 nm For Pulse Lengths In The Microsecond Regime", Proc. SPIE 1060, Nonlinear Optical Beam Manipulation and High Energy Beam Propagation Through the Atmosphere, (8 August 1989); https://doi.org/10.1117/12.951727

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