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DTIC ADA213926: Aspects of Raman Scattering
by Defense Technical Information Center
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Aspects of stimulated Raman scattering are investigated
to better understand the propagation of intense light
beams through the atmosphere. In addition, a new unstable
resonator cavities was developed for the long pulse
excimer laser used in the Raman beam-cleanup experiments
and have made preliminary measurements on an anti-Stokes
Raman laser which operates in the vacuum ultra violet
region of the spectrum. Experiments demonstrate the Raman
gain suppression observed on-axis, or at very small
angles, for rotational Raman gain using linearly
polarized beams in hydrogen and deuterium. The reduction
in vibrational Raman gain at the phase matching angle is
noted in hydrogen and deuterium. The normal exponential
gain observed in the transient limit has been modeled to
fit our experiment. The theory had to take account of the
actual beam shapes, both spatially and temporally, as
well as the self-phase modulation, in order to correctly
predict the observed gain functions. Experiments were
made on the beam quality and gain dependence of the 2nd
Stokes. In particular, a study of the seeding mechanism
responsible for generating the 2nd Stokes through the
threshold level, has required statistical, spectral, beam
profile and gain parameter studies. The far field pattern
was then compared with the Fourier transform of the near
field pattern to give a measure of the beam quality.
Pulse energy statistics of the self-generated Stokes as
well as of amplified and saturated Stokes have been
studied from the point of view of Raman beam control.
Such studies have mainly been restricted to Fresnel
number 1 systems although larger Fresnel number 10
systems have been studied by the control exerted over the
spatial patterns.
Date Published: 2018-02-23 15:18:15
Identifier: DTIC_ADA213926
Item Size: 43887934
Language: english
Media Type: texts
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