Paper
26 April 2019 Optical anisotropic coatings for polarization control in high-power lasers
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Abstract
In this work, a novel multi-layer approach of high band-gap birefringent columnar coatings was proposed and investigated. The growth of anisotropic columnar nano-structures with elliptical shape cross-section was initiated by self-shadowing effect, which was induced by placing the substrate at oblique angle during the deposition process. Amorphous silica was deposited in so-called serial bi-deposition manner to form anisotropic films with high thickness uniformity. The combination of birefringent nano-structured and isotropic layers allows to form zero-order wave-plates with desirable phase delay difference (as an example, λ/4). Low optical losses and high transparency (T~99%) are demonstrated while indicating the potential to withstand laser fluences of 40 J/cm2 and 15 J/cm2 in nanosecond regime at 355 nm and 266 nm wavelengths, respectively.
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Lina Grineviciute, Karolis Gricius, Rytis Buzelis, and Tomas Tolenis "Optical anisotropic coatings for polarization control in high-power lasers ", Proc. SPIE 11033, High-Power, High-Energy, and High-Intensity Laser Technology IV, 110330O (26 April 2019); https://doi.org/10.1117/12.2522509
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KEYWORDS
Wave plates

High power lasers

Polarizers

Silica

Thin film coatings

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