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, Zongshu Shao

*Corresponding author for this work

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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.

Original languageEnglish
Pages (from-to)652-661
Number of pages10
JournalJournal of the Optical Society of America B: Optical Physics
Volume20
Issue number4
DOIs
Publication statusPublished - Apr 2003
Externally publishedYes

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Liu, J., Ozygus, B., Yang, S., Erhard, J., Seelig, U., Ding, A., Weber, H., Meng, X., Zhu, L., Qin, L., Du, C., Xu, X., & Shao, Z. (2003). Efficient passive Q-switching operation of a diode-pumped Nd:GdVO4 laser with a Cr4+:YAG saturable absorber. Journal of the Optical Society of America B: Optical Physics, 20(4), 652-661. https://doi.org/10.1364/JOSAB.20.000652