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Proceedings Paper

Stimulated Brillouin Scattering In Carbon Disulfide At 1315 nm For Pulse Lengths In The Microsecond Regime
Author(s): Roger L Facklam; Ronald R Bousek
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Paper 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.

Paper Details

Date Published: 8 August 1989
PDF: 9 pages
Proc. SPIE 1060, Nonlinear Optical Beam Manipulation and High Energy Beam Propagation Through the Atmosphere, (8 August 1989); doi: 10.1117/12.951727
Show Author Affiliations
Roger L Facklam, Rockwell International (United States)
Ronald R Bousek, Rockwell International (United States)

Published in SPIE Proceedings Vol. 1060:
Nonlinear Optical Beam Manipulation and High Energy Beam Propagation Through the Atmosphere
Robert A. Fisher; LeRoy E. Wilson, Editor(s)

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