Diffraction Properties Of Laser Speckle Generated By Stimulated Rotational Raman Scattering In Long Air Paths*

Mark A Henesian; Deanna M Pennington

doi:10.1117/12.943798

8 April 1988 Diffraction Properties Of Laser Speckle Generated By Stimulated Rotational Raman Scattering In Long Air Paths*

Mark A Henesian, Deanna M Pennington

Author Affiliations +

Proceedings Volume 0874, Nonlinear Optical Beam Manipulation, Beam Combining, and Atmospheric Propagation; (1988) https://doi.org/10.1117/12.943798
Event: 1988 Los Angeles Symposium: O-E/LASE '88, 1988, Los Angeles, CA, United States

Abstract

We discuss 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. We have obtained 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. These phenomena significantly influence the beam filamentation and speckle structures observed in the near and far fields. We contrast present observations with previous SRRS experiments at Lawrence Livermore National Laboratory using the Nova Laser.

Citation Download Citation

Mark A Henesian and Deanna M Pennington "Diffraction Properties Of Laser Speckle Generated By Stimulated Rotational Raman Scattering In Long Air Paths*", Proc. SPIE 0874, Nonlinear Optical Beam Manipulation, Beam Combining, and Atmospheric Propagation, (8 April 1988); https://doi.org/10.1117/12.943798

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