Measuring methods of arrival angles of the laser radiation in the system of adaptive optics

2018 ◽  
Author(s):  
Vitaly V. Lavrinov ◽  
Lidia N. Lavrinova ◽  
Leonid V. Antoshkin ◽  
Alexander G. Borzilov
Keyword(s):  
Laser Radiation ◽  
Adaptive Optics ◽  
Measuring Methods ◽  
Arrival Angles

scholarly journals Adaptive Optical Systems in Air-Based Laser System. Analytical Review. Part 1. Current Status

2019 ◽  
pp. 1-23
Author(s):  
Yu. I. Shanin
Keyword(s):  
Laser Radiation ◽  
Adaptive Optics ◽  
Laser System ◽  
The United States ◽  
High Energy ◽  
Optical Systems ◽  
Current Status ◽  
Powerful Laser ◽  
Optical Elements ◽  
Laser Systems

Aviation-based laser complex is a complex technical object. Among its systems, we analyse only an adaptive optical system and issues related to its performance, and show that the effectiveness of the complex without an adaptive system is small. The analysis was carried out in terms of systems that were developed in the United States.Using the tilt corrector, an adaptive optics provides accurate tracking of the object. A deformable mirror performs correction of higher-order radiation wavefront aberrations caused by atmospheric turbulence for incoming light and outgoing laser radiation. The advantages of onboard laser systems are the beam propagation at the speed of light and the low price of a shot. The disadvantages are that the target should be in line-of-sight and there is a negative influence of the atmosphere. Another negative influences are vibrations of the aircraft and the aero-optical problem because of output radiation. An assured thermal target kill is possible at the range of 3-10 km. A functional kill and suppression are capable at ranges of 102-103 times longer than for the thermal target kill.Among the programs for the development of an onboard laser in the USA, the YAL, ATL and ABL programs are considered. The YAL program is an attempt to intercept short-and medium-range missiles with a powerful laser. The ATL system was to be installed on a heavily armed ground support aircraft. An airborne laser (ABL) is a demonstration of the U.S. Air Force of a high-energy laser system designed to destroy missiles on their boost phase. Over 30 years and several tens of billions of dollars were expended to develop the systems. Unfortunately, all onboard laser development programs have been closed.Experience of the flying laboratories is realized by Cessna Citations and Falcon 10s planes and is relevant, as it gives the chance to estimate adverse effects of aero-optics and vibrations directly in flight.Among the problems that need to be solved when creating adaptive optics for an onboard laser, the following are highlighted:-      loss of compensation capabilities;-      thermal effects of laser radiation on optical elements;-      creation of attenuators and radiation couplers;-    mitigating the negative effects of the onboard platform on radiation;-      operation reliability of the actuators of correction devices;-      technological working off of the uncooled optical elements which are affected by powerful laser radiation.For newly developed aviation-based laser systems, it is necessary to envision the niche in which their use will be most efficient.

scholarly journals The combined use of adaptive optics and nonlinear optical wavefront reversal techniques to compensate for turbulent distortions when focusing laser radiation on distant objects

2020 ◽  
Vol 44 (4) ◽  
pp. 519-532 ◽  
Author(s):  
V.P. Lukin ◽  
N.N. Botygina ◽  
P.A. Konyaev ◽  
O.V. Kulagin ◽  
I.A. Gorbunov
Keyword(s):  
Laser Radiation ◽  
Adaptive Optics ◽  
Nonlinear Optical ◽  
Fourier Transforms ◽  
Statistical Tests ◽  
Diffraction Spot ◽  
Step Method ◽  
Combined Use ◽  
Turbulent Distortions ◽  
Quantitative Results

Approaches to constructing a mock-up of a system for focusing laser radiation on distant objects using both adaptive optics elements and nonlinear-optical wavefront reversal methods providing compensation for turbulent distortions are considered. Numerical calculations were preliminarily performed, in which the split-step method was used as a numerical method for solving a second-order partial differential wave equation for the complex amplitude of the wave field of a laser beam. This method, combined with methods of spectral-phase Fourier transforms and statistical tests, is the most effective way to obtain reliable quantitative results for solving engineering problems of atmospheric wave optics. Quantitative data are obtained on the effect of turbulent atmospheric distortions along propagation paths on the main parameters of coherent laser beams – focusing, effective average radius, and the proportion of the beam energy in its diffraction spot. The preliminary results obtained of the system mock-up performance confirm the conclusions of the theory.

PHASE CONJUGATION OF KrF LASER RADIATION

1983 ◽  
Vol 44 (C2) ◽  
pp. C2-19-C2-25
Author(s):  
M. C. Gower ◽  
R. G. Caro
Keyword(s):  
Laser Radiation ◽  
Phase Conjugation ◽  
Krf Laser

HEATING OF CRYSTALLINE AND AMORPHOUS SILICON BY C-SWITCHED LASER RADIATION

1980 ◽  
Vol 41 (C4) ◽  
pp. C4-31-C4-36
Author(s):  
J. R. Meyer ◽  
F. J. Bartoli ◽  
M. R. Kruer
Keyword(s):  
Laser Radiation ◽  
Amorphous Silicon
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