SLD Seeded All Fiber Cascaded Nanosecond Pulsed Amplifier¹

H. T. Zhang, M. Liu, P. Yan, M. L. Gong*, C. Zheng, K. Meng, and W. Y. Cheng

State Key Laboratory of Tribology, Center for Photonics and Electronics, Department of Precision Instruments,
Tsinghua University, Beijing 100084, China
*e-mail: mlgong@mail.tsinghua.edu.cn

Received January 1, 2012; in final form, April 3, 2012; published online July 9, 2012

Abstract—A Super-luminescent Diode (SLD) seeded all fiber cascaded pulsed laser system is reported. The
signal line width is 8 nm confined by spectrum filers between stages, much wider than Laser Diode (LD) seeded
laser. The wide spectrum of the seed source gives a good opportunity to get higher stimulated brillouin scatter-
ing threshold than LD seeded laser. The system emits up to 50 W pulses at a wavelength of 1064 nm and a rep-
etition rate of 20 kHz with peak power 250 kW and beam quality M2 < 1.8. No SBS or SRS are observed and
its output power is limited only by available pump power.

DOI: 10.1134/S1054660X1208018X

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