TIL system with nonlinear phase conjugation

Khizhnyak, Anatoliy; Markov, Vladimir B.

doi:10.1117/12.735161

Cited by 2 publications

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“…In this cavity the target acts as one of the mirrors and the phase-conjugate mirror (PCM) as the second one [2,3]. It was shown earlier [8] that the transverse modes of the PCM cavity have maximum quality as compared to the laser cavities with other types of the end reflectors.…”

Section: P2 Co-2qmentioning

confidence: 98%

“…An example of a system schematic that can satisfy the ATIL requirement is shown in Figure 1 and is based on the careful analysis of the results of our prior studies [4]. Following [3], selection of the beacon spatial structure and its location on the target can be achieved by using an aperture at the image plain of the receiving telescope that serves to collect the target-scattered light. From the entire pattern of the telescope-formed image the aperture selects only the portion of light that arrives from the location on the target where the beacon is considered to be placed.…”

Section: P2 Co-2qmentioning

confidence: 99%

“…Practical realization of this technique entails formation of a small-size light beacon at a certain location on the target [1]. The target-in-the-loop (TIL) technique [2,3,4] in combination with the phase conjugation of the laser beam returning on the target is a promising solution to the problem. Two critical capabilities are essential to enable such an end-to-end operation of the beacon-forming laser system: (i) Delivery of a sufficient level of energy on the remote image-resolved target;…”

Section: Introductionmentioning

confidence: 99%

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Advanced TIL system for laser beam focusing in a turbulent regime

et al. 2014

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This paper discusses an advanced target in the loop (ATIL) system with its performance based on a nonlinear phase conjugation scheme that performs rapid adjustment of the laser beam wavefront to mitigate effects associated with atmospheric turbulence along the propagation path. The ATIL method allows positional control of the laser spot (the beacon) on a remote imaged-resolved target. The size of this beacon is governed by the reciprocity of two counterpropagating beams (one towards the target and another scattered by the target) and the fidelity of the phase conjugation scheme. In this presentation we will present the results of the thorough analysis of ATIL operation, factors that affect its performance, its focusing efficiency and the comparison of laboratory experimental validation and computer simulation results.

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Section: P2 Co-2qmentioning

confidence: 98%

Section: P2 Co-2qmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Advanced TIL system for laser beam focusing in a turbulent regime

et al. 2014

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

et al. 2020

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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.

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TIL system with nonlinear phase conjugation

Cited by 2 publications

References 0 publications

Advanced TIL system for laser beam focusing in a turbulent regime

Advanced TIL system for laser beam focusing in a turbulent regime

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

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