Dr. Dov Abramovich Profile

Dr. Dov Abramovich

System engineer at Elbit Systems Electro-Optics El-Op Ltd

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Proceedings Article | 4 April 1997 Paper

Passive Q-switching of high-power solar-pumped Nd:YAG laser

Idit Pe'er, Nir Naftali, Dov Abramovic, Amnon Yogev, M. Lando, Y. Shimony

Proceedings Volume 3092, (1997) https://doi.org/10.1117/12.270236

KEYWORDS: Nd:YAG lasers, Q switching, Q switches, Q switched lasers, YAG lasers, High power lasers, Rod lasers, Mirrors, Continuous wave operation, Switching

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High power lasers operating at high repetition rates at the kilohertz regime are attractive for a variety of applications. Such high repetition rates can be achieved by Q-switching a cw laser using either an acousto-optic, an electro-optic or a passive Q-switch. Since passive Q-switching needs no external electric circuit, it may be valuable for solar pumped lasers to be used at space. In recent years, Cr⁴⁺:YAG has been extensively used for passive Q-switching of flashlamp pumped Nd:YAG lasers. For high average power lasers, the excellent thermal characteristics of Cr⁴⁺:YAG give it an edge over other saturable absorbers. In the present paper we report on the first passive Q-switching of solar pumped high power Nd:YAG laser. This solar pumped Nd:YAG laser, which employed 3 and 4 mm diameter Nd:YAG rods, emitted up to 50 watts in the cw mode. The laser rod was side-pumped by solar irradiation using a three-stage concentrating system. The Cr⁴⁺:YAG device rear surface was coated by high reflection dielectric coating, serving as cavity rear mirror, while the output mirror had a reflectivity of 90%. An average output power of 9 watts was obtained from the passive Q-switched solar pumped laser at 15 - 40 kHz, twice previous results for a passive Q- switched Nd:YAG laser, results which have been obtained under continuous flashlamp pumping.

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