Incoherent combining of 100-W Yb-fiber laser beams by PTR Bragg grating

被引:34
|
作者
Ciapurin, IV [1 ]
Glebov, LB [1 ]
Glebova, LN [1 ]
Smirnov, VI [1 ]
Rotari, EV [1 ]
机构
[1] Univ Cent Florida, Sch Opt, CREOL, Orlando, FL 32816 USA
来源
ADVANCES IN FIBER LASERS | 2003年 / 4974卷
关键词
photo-thermo-refractive glass; volume diffractive elements; high-energy lasers; incoherent beam combining;
D O I
10.1117/12.501670
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
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/cm(2). 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.
引用
收藏
页码:209 / 219
页数:11
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