Demonstration of controlled spatial incoherence for beam smoothing

Dorrer, C.; Spilatro, M. A.

doi:10.1364/oe.553774

Title: Demonstration of controlled spatial incoherence for beam smoothing

Journal Article · 18 February 2025 · Optics Express

DOI: https://doi.org/10.1364/oe.553774 · OSTI ID:2520174

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University of Rochester, NY (United States)

A concept for beam smoothing of high-energy laser systems is demonstrated. Multiple coherent beams are multiplexed so that their incoherent mix decreases the far-field nonuniformity after random spatial phase modulation introduced by a phase plate. Modeling shows that the incoherent mix effectively leads to the expected scaling in terms of the number of uncorrelated beams, and that spatial multiplexing can be combined with smoothing by spectral dispersion. The results of an experimental demonstration of this concept with up to six beams, leading to more than 40 modes with polarization multiplexing and angular dispersion, are consistent with expectations. The potential practical advantages of this smoothing scheme and future developments are discussed.

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Research Organization:: University of Rochester, NY (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0004144

OSTI ID:: 2520174

Journal Information:: Optics Express, Journal Name: Optics Express Journal Issue: 4 Vol. 33; ISSN 1094-4087

Publisher:: Optical Society of America (OSA)Copyright Statement

Country of Publication:: United States

Language:: English

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