Numerical investigation of dynamic coherent beam combining in turbulent atmosphere with taking into account the double-pass delay

O. A. Kuzikov; M. V. Volkov; F. A. Starikov

doi:10.1117/12.2644968

7 December 2022 Numerical investigation of dynamic coherent beam combining in turbulent atmosphere with taking into account the double-pass delay

O. A. Kuzikov, M. V. Volkov, F. A. Starikov

Author Affiliations +

Proceedings Volume 12341, 28th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics; 123411C (2022) https://doi.org/10.1117/12.2644968
Event: 28th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics, 2022, Tomsk, Russia

Abstract

The paper is devoted to numerical investigation of coherent beam combining of 7-channel laser radiation and its focusing on the remote receiver in dynamic turbulent medium using the two-step stochastic parallel gradient (SPG) algorithm with the double-pass delay included in the step time or in the temporal shift between steps. Dynamic turbulent medium has been modelled using one phase screen approximation based on the Taylor hypothesis. The spatial spectrum of turbulent distortions has corresponded to the von Kármán spectrum and has been characterized by the atmospheric coherence radius (the Fried parameter) r₀. Combining efficiency has been estimated for various ratios of the aperture size d to r₀ and ratios of the phasing frequency νph (reciprocal value of time interval required to achieve the Strehl ratio equaled 0.8 in the nonturbulent medium) to the Greenwood frequency ν_G. The requirements for d/r₀ and ν_ph / ν_G values have been determined, under which the SPG coherent beam combining with taking into account the double-pass delay provides the Strehl ratio level of ~0.7 or higher.

Citation Download Citation

O. A. Kuzikov, M. V. Volkov, and F. A. Starikov "Numerical investigation of dynamic coherent beam combining in turbulent atmosphere with taking into account the double-pass delay", Proc. SPIE 12341, 28th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics, 123411C (7 December 2022); https://doi.org/10.1117/12.2644968

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available