Efficient side pumping of high-ower fiber lasers using doubly grooved binary metallic diffraction gratings

zhang fan; wang chun-an; geng rui; tong zhi; ning ti-ang

Volume 19 Issue 11

Nov. 2007

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zhang fan, wang chun-an, geng rui, et al. Efficient side pumping of high-ower fiber lasers using doubly grooved binary metallic diffraction gratings[J]. High Power Laser and Particle Beams, 2007, 19.

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zhang fan, wang chun-an, geng rui, et al. Efficient side pumping of high-ower fiber lasers using doubly grooved binary metallic diffraction gratings[J]. High Power Laser and Particle Beams, 2007, 19.

zhang fan, wang chun-an, geng rui, et al. Efficient side pumping of high-ower fiber lasers using doubly grooved binary metallic diffraction gratings[J]. High Power Laser and Particle Beams, 2007, 19.

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Efficient side pumping of high-ower fiber lasers using doubly grooved binary metallic diffraction gratings

1.
Institute of Lightwave Technology,Beijing Jiaotong University,Beijing 100044,China

Publish Date: 2007-11-15

Abstract

Abstract

A metallic binary grating with two grooves per period, defined by different linewidths and the same depth, is applied to side-pumping high power fiber lasers for the first time. This kind of doubly grooved metallic grating can be fabricated directly on inner clad of double-clad fiber and so that it can be used for high-power laser pumping. By combining a gradient algorithm (quasi-Newton methods) and micro- genetic algorithm, the grating is optimized and the maximum coupling efficiencies of 94.77% and 77.27% for TM and TE polarization waves respectively are demonstrated. Meanwhile, the fabrication-error and the minimum feature size of grating are also analyzed.
- fiber laser,
- double-clad fiber,
- metal diffraction grating,
- coupling efficiency

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