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Passively Q-switched diode pumped Nd:YAG, Nd:YVO4 and Nd:GdVO4 using (Cr4+,Ca2+):YAG and (Cr4+,Mg2+):YAG saturable absorbers
Author(s): Yehoshua Kalisky; O. Kalisky; Milan R. Kokta
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Paper Abstract

We report the operation of passively Q-switched diode-end-pumped Nd:YAG and Nd:YVO4 lasers by employing Cr4+-doped garnets with Ca2+ or Mg2+ as charge compensators. We found that the laser performance improved significantly, mainly in the Nd:YVO4 system when (Cr4+,Mg2+):YAG sample was used as a passive Q-switching. For example, in the Nd:YVO4 and Nd:YAG lasers, the maximum peak power using (Cr4+,Mg2+):YAG saturable absorber was higher by a factor of 8.5 and 2.6, respectively, relative to (Cr4+,Ca2+):YAG. This fact is attributed to better optical quality of the (Cr4+,Mg2+):YAG sample, as a result of improved dopant distribution and reduced internal stresses inside the saturable absorber crystals. Similar passively Q-switched laser performance can be obtained by using other garnets with an open structure, and hence, with low internal stresses, such as (Cr 4+,Ca2+):GGG. We also compared the laser performance of Nd:GdVO4 with the same saturable absorbers and obtained both passive Q-switching and passive mode locking. By using an analytical model with the relevant physical parameters of the laser crystals and saturable absorbers it is possible to optimize the laser performance.

Paper Details

Date Published: 19 February 2008
PDF: 9 pages
Proc. SPIE 6875, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications VII, 687511 (19 February 2008); doi: 10.1117/12.763616
Show Author Affiliations
Yehoshua Kalisky, Nuclear Research Ctr.-Negev (Israel)
O. Kalisky, Jerusalem College of Technology (Israel)
Milan R. Kokta, Saint-Gobain Crystals and Detectors (United States)

Published in SPIE Proceedings Vol. 6875:
Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications VII
Peter E. Powers, Editor(s)

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