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10 September 2019 Physical characteristics of the USLP beacon for laser beam control (Conference Presentation)
Vladimir Markov, Anatoliy Khizhnyak, Joshua Isaacs, Phil Sprangle
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Proceedings Volume 11133, Laser Communication and Propagation through the Atmosphere and Oceans VIII; 111330X (2019) https://doi.org/10.1117/12.2531330
Event: SPIE Optical Engineering + Applications, 2019, San Diego, California, United States
Abstract
Effective performance of laser systems intended for power delivery on a distant object requires an Adaptive Optics System (AOS) to correct distortions of the laser beam caused by atmospheric perturbations along the propagation path. The turbulence-induced effects are responsible for beam wandering and intensity scintillation, resulting in degradation of the beam quality and waning of the power density on the target. Adaptive optics methods are used to compensate these negative effects, though an effective AOS performance requires a reference wave formed, for example, by the beacon on the target. One way of forming such a beacon is by using an ultra-short laser pulse (USLP) delivered a tight light spot. Multiple physical phenomena play a key role at USLP propagation in turbulent atmosphere, including: (a) atmospheric perturbations and random amplitude-phase modulation of the propagating beam; (b) spatial modulation of the wavefront and beam shape expressed as its self-focusing caused by the non-linear effects in the atmosphere; (c) a laser noise at USLP propagating in dispersive and nonlinear media. This presentation discusses the requirements to the USLP-based beacon that can support optimal operation of the AOS for effective correction of the wavefront of the outgoing power beam.
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Vladimir Markov, Anatoliy Khizhnyak, Joshua Isaacs, and Phil Sprangle "Physical characteristics of the USLP beacon for laser beam control (Conference Presentation)", Proc. SPIE 11133, Laser Communication and Propagation through the Atmosphere and Oceans VIII, 111330X (10 September 2019); https://doi.org/10.1117/12.2531330
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KEYWORDS
Atmospheric propagation
Adaptive optics
Atmospheric physics
Beam controllers
Laser beam propagation
Beam shaping
Light wave propagation
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