Abstract
We report the first observation of parametric gain suppression of stimulated rotational Raman scattering (SRRS) in atmospheric N2 in propagation experiments over long air paths with a large-aperture large-Fresnel-number beam. We previously reported our observations of small-scale beam breakup in the near field and high-divergence speckle in the far field in strong SRRS conditions.1 In our most recent data this speckle is absent in a far-field zone surrounding the forward direction and appears in a narrow cone peaked at an angle of ~300 μrad. We believe this is a manifestation of Raman gain suppression.
© 1988 Optical Society of America
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