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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Vol. 20, Iss. 4 — Apr. 1, 2003
  • pp: 652–661

Efficient passive Q-switching operation of a diode-pumped Nd:GdVO4 laser with a Cr4+:YAG saturable absorber

Junhai Liu, Bernd Ozygus, Suhui Yang, Jürgen Erhard, Ute Seelig, Adalbert Ding, Horst Weber, Xianlin Meng, Li Zhu, Lianjie Qin, Chenlin Du, Xinguang Xu, and Zongshu Shao  »View Author Affiliations


JOSA B, Vol. 20, Issue 4, pp. 652-661 (2003)
http://dx.doi.org/10.1364/JOSAB.20.000652


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Abstract

A diode-pumped highly efficient Cr4+:YAG passively Q-switched Nd:GdVO4 laser formed by a plano–concave resonator has been demonstrated. At the highest attainable absorbed pump power of 11.4 W, 4.05 W of average output power, which was two thirds of the maximum corresponding cw output, was achieved with an optical conversion efficiency of 35.5%, and the slope efficiency was determined to be 46.8%, reaching 85% of the magnitude of its cw counterpart. The resulting shortest pulse duration, single-pulse energy, and peak power were found to be 13 ns, 90 μJ, and 7 kW, respectively, with a pulse repetition frequency (PRF) of 45 kHz. Two particularly modified resonator configurations were employed; the largest pulse energy and the highest peak power reached were, respectively, 154 μJ and 11.2 kW at 8.5 W of absorbed pump power. An analytical relation between the PRF and the absorbed pump power is given for a passively Q-switched laser, showing good consistency with experiment with a Nd:GdVO4 laser. The dependence of the operational parameters on the pump power and on the output coupling was also investigated experimentally. Issues involving the criterion for passive Q switching are discussed in some detail for Cr4+:YAG passively Q-switched neodymium-doped vanadate lasers.

© 2003 Optical Society of America

OCIS Codes
(140.3410) Lasers and laser optics : Laser resonators
(140.3480) Lasers and laser optics : Lasers, diode-pumped
(140.3530) Lasers and laser optics : Lasers, neodymium
(140.3540) Lasers and laser optics : Lasers, Q-switched
(140.3580) Lasers and laser optics : Lasers, solid-state

Citation
Junhai Liu, Bernd Ozygus, Suhui Yang, Jürgen Erhard, Ute Seelig, Adalbert Ding, Horst Weber, Xianlin Meng, Li Zhu, Lianjie Qin, Chenlin Du, Xinguang Xu, and Zongshu Shao, "Efficient passive Q-switching operation of a diode-pumped Nd:GdVO4 laser with a Cr4+ : YAG saturable absorber," J. Opt. Soc. Am. B 20, 652-661 (2003)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-20-4-652

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