Physics
Scientific paper
Jan 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988spie..874....2h&link_type=abstract
IN: Nonlinear optical beam manipulation, beam combining, and atmospheric propagation; Proceedings of the Meeting, Los Angeles, C
Physics
1
Laser Outputs, Optical Paths, Raman Spectra, Diffraction, Fresnel Region, Kerr Effects, Nova Laser System, Speckle Patterns
Scientific paper
The unusual diffraction properties of laser speckle and related structures generated by stimulated rotational Raman scattering (SRRS) from nitrogen in long air paths with collimated, large aperture beams are discussed. Convincing evidence for the four-wave parametric gain suppression of SRRS and enhancement of nonlinear diffraction by Raman-induced Kerr effect in this high Fresnel number geometry has been obtained. These phenomena significantly influence the beam filamentation and speckle structures observed in the near and far fields. Present observations are contrasted with previous SRRS experiments at Lawrence Livermore National Laboratory using the Nova Laser.
Henesian Mark A.
Pennington Deanna M.
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