Local-Cooled Watt-Level Nd-Doped Phosphate
Single-Mode Fiber Laser¹

G. Zhang^{a, b,} *, C. L. Yu^a, M. Wang^a, Q. L. Zhou^a, J. R. Qiu^c,
L. L. Hu^a, and D. P. Chen^a, **

^a Key Laboratory of Material Science and Technology for High Power Lasers,
Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences,
Shanghai, 201800 China

^b Graduate School of the Chinese Academy of Sciences, Beijing, 100039 China

^c Institute of Optical Communication Materials, South China University of Technology,
Guangzhou, 510641 China

*e-mail: maxzw2008@163.com
**e-mail: d-chen@mail.siom.ac.cn

Received February 8, 2012; published online June 12, 2012

Abstract—Efficient and stable continuous-wave (CW) laser operation at 1053 nm in a Nd-doped phosphate
single-mode fiber (Nd:PSMF) has been demonstrated experimentally. The fiber laser consisted of a 21 cm
Nd:PSMF placed in a F–P cavity formed by high reflector butt-coupled to coupling end of the fiber and Fresnel
reflection of the other end facet. An output power of 1.42 W and a slope efficiency of 34.1% (18.4%) with
respect to absorbed pump power (incident pump power) were obtained with 808 nm diode pumping. An incre-
ment as much as 9.7 and 15.0% in slope efficiency of the input coupling efficiency and the output power, respec-
tively, were obtained by using a local-cooling design provided by watered sealing the coupling point. The
repeatable results indicate that the design, featuring fluid sealing the coupling point of the fiber laser, which was
capable of offering an effective alleviation of thermal effects and an elevation of the quality of the laser cavity,
could be expected to be a convenient and effective scheme to improve the performance characteristics of the
non-silica fiber lasers and the high power fiber lasers, generally in free-space coupling configuration.

DOI: 10.1134/S1054660X12070201

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