In a recent paper [J. Opt. Soc. Am. A 33, 1931–1937 (2016)], the target-in-the-loop (TIL) phasing of an RF-modulated or multi-phase-dithered fiber laser array, fed by a linewidth-broadened master oscillator (MO) source, was investigated. It was found that TIL phasing was possible even on a target with scattering features separated by more than the MO’s coherence length as long as the received, backscattered irradiance changed with the array’s modulation or phase dither. To simplify the problem and gain insight into how temporal coherence affects TIL phasing, speckle and atmospheric turbulence were omitted from the analysis. Here, the scenario analyzed in the prior work is generalized by including speckle and turbulence. First, the key analytical result from the prior paper is reviewed. Simulations, including speckle and turbulence, are then performed to test whether the conclusions derived from that result hold under more realistic conditions.
Milo W. Hyde, Glenn A. Tyler, and Carlos Rosado Garcia, "Target-in-the-loop phasing of a fiber laser array fed by a linewidth-broadened master oscillator," Proc. SPIE 10192, Laser Technology for Defense and Security XIII, 101920K (Presented at SPIE Defense + Security: April 11, 2017; Published: 1 May 2017); https://doi.org/10.1117/12.2257581.
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