26 May 1999 Nonlinear phase-conjugate mirrors for atmospheric distortion compensation
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Abstract
The severe requirements are posed on nonlinear phase conjugation (PC) mirrors with using those for compensation of laser beam aberrations in turbulent atmosphere at large distances. These requirements are connected with high losses of a laser-illuminator radiation due to atmospheric beam spreading and also with strong modulation of phase and intensity distribution in the beam being conjugated. To specify these requirements we present in this paper results of numerical simulation of the process of PC correction of atmospheric distortion. The simulation was carried out for various parameters of an atmospheric range and various radiation wavelengths. It was shown that in the case of strong turbulent scintillation the PC compensation allows one to increase the beam intensity by three orders of magnitude. The beam energy delivered to the receiver is close to that delivered in absence of turbulence if turbulent inhomogeneities of high spatial frequency are resolved by transmitter. The requirements to the PC mirror are formulated for the angle of view, reflection coefficient, reproduction fidelity, etc. The influence of saturation effects in a laser amplifier on fidelity of atmospheric distortion compensation is analyzed.
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Nikolay A. Romanov, Aleksey A. Leshchev, Andrey Yu. Rodionov, Victor E. Semenov, Vladimir E. Sherstobitov, Nina V. Vysotina, "Nonlinear phase-conjugate mirrors for atmospheric distortion compensation", Proc. SPIE 3610, Laser Material Crystal Growth and Nonlinear Materials and Devices, (26 May 1999); doi: 10.1117/12.349231; https://doi.org/10.1117/12.349231
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