Journal
OPTICS LETTERS
Volume 42, Issue 17, Pages 3347-3350Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.42.003347
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Funding
- National Natural Science Foundation of China (NSFC) [61635005]
- Huo Yingdong Education Foundation
- Foundation for the Author of National Excellent Doctoral Dissertation of the People's Republic of China (FANEDD)
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We report on the demonstration of a high power, high beam quality random fiber laser. It is a half-open cavity based on 130-m-long large mode area step-index fiber with a core diameter of 20 mu m and a numerical aperture of 0.08. The random laser cavity, whose central wavelength is 1120 nm, is pumped by a 1070 nm Yb-doped fiber oscillator. The maximum output power is 418 W with respect to the injected pump power of 588 W, corresponding to the optical-to-optical efficiency of 71%. The output power, spectral, and temporal characteristics are carefully presented and discussed, showing that such a cavity can export high power random laser stably and effectively. The far field beam quality is also measured, and the profile is nearly a Gaussian shape. This work provides an impactful method to advance the output power of random fiber lasers. (C) 2017 Optical Society of America
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