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Proceedings Paper

Incoherent combining of 100-W Yb-fiber laser beams by PTR Bragg grating
Author(s): Igor V. Ciapurin; Leonid B. Glebov; Larissa N. Glebova; Vadim I. Smirnov; Eugeniu V. Rotari
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Paper Abstract

Volume diffractive gratings (Bragg gratings) in photo-thermo-refractive (PTR) inorganic glass are proposed for incoherent laser beam combining because they have narrow spectral selectivity and diffraction efficiency greater than 95% from visible to near IR regions. They showed no laser-induced damage, no thermal lens, and no Bragg angle shift under CW Yb-fiber laser (1096 nm) irradiation at 100 kW/cm2. It opens the way to rugged, low-cost, efficient optics for high-power laser systems. Based on theoretical modeling of PTR Bragg gratings, we have designed a high-efficient technology for incoherent combining of two or several laser beams with certain wavelength shift. Two 100 W beams of Yb-fiber lasers in the range of 1080-1100 nm with the wavelength separation of 11 nm were combined with efficiency exceeding 75% while material losses did not exceed 2-4%. No fading or parameter change of PTR Bragg grating working in two 100 W beams were found. It was found that the process limiting efficiency of incoherent beam combining is the spectral widening of radiation of Yb-doped fiber lasers. At high power, their spectral width exceeds spectral selectivity of Bragg grating and causes a decrease of diffraction efficiency.

Paper Details

Date Published: 3 July 2003
PDF: 11 pages
Proc. SPIE 4974, Advances in Fiber Lasers, (3 July 2003); doi: 10.1117/12.501670
Show Author Affiliations
Igor V. Ciapurin, CREOL/Univ. of Central Florida (United States)
Leonid B. Glebov, CREOL/Univ. of Central Florida (United States)
Larissa N. Glebova, CREOL/Univ. of Central Florida (United States)
Vadim I. Smirnov, CREOL/Univ. of Central Florida (United States)
Eugeniu V. Rotari, CREOL/Univ. of Central Florida (United States)

Published in SPIE Proceedings Vol. 4974:
Advances in Fiber Lasers
L. N. Durvasula, Editor(s)

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