Mitigation of the turbulent degradation effects in a laser beam

Mikhail S. Belen'kii

doi:10.1117/12.330218

3 November 1998 Mitigation of the turbulent degradation effects in a laser beam

Mikhail S. Belen'kii

Proceedings Volume 3433, Propagation and Imaging through the Atmosphere II; (1998) https://doi.org/10.1117/12.330218
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

Abstract

Two techniques for mitigation of turbulent degradation effects are presented. Both techniques do not require sensing and compensating for the wavefront aberrations. The first method is based on the fact that the coherence radius of a focused beam in a wide range of turbulent conditions does not depend on the strength of turbulence and coincides with a diffractive diameter of the beam. In this regime the coherence scale of the beam increase with increasing distance and decreasing the aperture size. This permits us to mitigate the coherence degradation of the beam. It is the coherence radius to the effective beam size.THe experimental data, which support the theoretical predictions are presented. The second method relates to the phenomenon called regular change of the mean wavefront curvature caused by turbulence. This method use a systems with a variable image plane, which position is adjusted in accordance with variations of the strength of turbulence. Both methods permit us to increase the Strehl ratio of an imaging system without sensing and compensating for wavefront aberrations. A combination of the two techniques can also be exploited.

Citation Download Citation

Mikhail S. Belen'kii "Mitigation of the turbulent degradation effects in a laser beam", Proc. SPIE 3433, Propagation and Imaging through the Atmosphere II, (3 November 1998); https://doi.org/10.1117/12.330218

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