Abstract
Possible ways of laser beam cleanup from speckle noise imposed on this beam are considered. Such a cleanup is required: (1) when a self-focusing instability causes buildup of a parasitic field with a speckle inhomogeneous transverse structure against a high power beam with a diffraction-limited divergence. Speckles can also be generated by the defects of optical elements; (2) when a weak signal with the diffraction-limited divergence is amplified in a narrowband amplifier. It is necessary that the energy in the active elements be transformed into a signal rather than noise of the amplified spontaneous radiation; (3) in designing optical schemes with associative memory, which are capable of reproducing a light beam by its individual fragments.
© 1990 Optical Society of America
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