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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 8 — Apr. 11, 2011
  • pp: 7312–7324

Phase locking of a 275W high power all-fiber amplifier seeded by two categories of multi-tone lasers

Xiaolin Wang, Jingyong Leng, Pu Zhou, Wenbo Du, Hu Xiao, Yanxing Ma, Xiaolin Dong, Xiaojun Xu, Zejin Liu, and Yijun Zhao  »View Author Affiliations

Optics Express, Vol. 19, Issue 8, pp. 7312-7324 (2011)

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Multi-tone radiation is a promising technique to suppress stimulated Brillouin scattering (SBS) effects and improve the ultimate output power of the fiber laser/amplifier. Coherent beam combining of fiber lasers/ amplifiers is another feasible way to increase the output laser power from single gain medium while simultaneously maintaining good beam quality. In this paper, we combine the multi-tone driven all-fiber amplifiers and active phase compensation to demonstrate high power phase locking for coherent beam combining. First, we present the theory of coherent beam combining of multi-tone lasers. Second, we optimize the all-fiber power amplifier oscillator power-amplifier (MOPA) system with high scalability and flexibility based on compact, high efficiency Yb-doped fiber amplifier chains. Then, two categories of multi-tone master oscillators are used to driven the amplifier chains. The first category is two coupled single-frequency lasers and the second is a frequency modulated single-frequency laser. The output powers are all boosted to 275W without any distinct SBS. Last, phase locking of the amplifier chains are implemented using stochastic parallel gradient descent (SPGD) algorithm. Scaling this configuration to a higher power involves increasing the power per chain and adding the number of amplifier channels.

© 2011 OSA

OCIS Codes
(060.2630) Fiber optics and optical communications : Frequency modulation
(140.0140) Lasers and laser optics : Lasers and laser optics
(140.3280) Lasers and laser optics : Laser amplifiers
(140.3290) Lasers and laser optics : Laser arrays

ToC Category:
Lasers and Laser Optics

Original Manuscript: January 11, 2011
Revised Manuscript: March 12, 2011
Manuscript Accepted: March 22, 2011
Published: April 1, 2011

Xiaolin Wang, Jingyong Leng, Pu Zhou, Wenbo Du, Hu Xiao, Yanxing Ma, Xiaolin Dong, Xiaojun Xu, Zejin Liu, and Yijun Zhao, "Phase locking of a 275W high power all-fiber amplifier seeded by two categories of multi-tone lasers," Opt. Express 19, 7312-7324 (2011)

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