Picosecond Pulse of Variable Duration by Phase Matching
Frequency Doubling Crystal¹

Q. S. Pang^a, *, G. J. Bi^a, J. H. Li^b, L. Chang^c, Y. Zou^a,
X. J. Mao^a, J. J. Wang^a, and G. Li^c

^a Science and Technology on Solid-State Laser Laboratory, North China Research Institute of Electro-Optics
Beijing 100015, China

^b CRYSTECH Inc., Electronic Information Industrial Park, Xianshan East Road, Chengyang District,
Qingdao, 266107, China

^c Institute of Laser Engineering, Beijing University of Technology, Beijing 100022, China

*e-mail: qshpang@126.com

Received December 19, 2011; in final form, December 25, 2011; published online September 3, 2012

Abstract—Report on a semiconductor saturable absorber mirror (SESAM) passively mode-locked picosecond
Nd:YVO₄ laser, with adjustable durations between 8.7 and 70 ps. The pulse duration was adjustable by varying
the length of type II phase matching KTiOPO₄ (KTP) crystal. Type II phase matched second harmonic interac-
tion in combination with the anisotropic emission characteristic of Nd:YVO₄ introduced additional bandwidth
limiting through birefringent filtering.

DOI: 10.1134/S1054660X12100179

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