Performance of Nd:YAG Lasers in Coupled Generalized Self-Filtering and Positive-Branch Unstable Resonators
Applied Optics, Vol. 38, Issue 21, pp. 4516-4527 (1999)
http://dx.doi.org/10.1364/AO.38.004516
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Abstract
A new optical resonator based on the combination of a generalized self-filtering unstable resonator (GSFUR) and a positive-branch unstable resonator (PBUR) in a three-mirror scheme is reported. It is shown both theoretically and experimentally that a nearly diffraction-limited Gaussian-output laser beam with a large mode volume can be obtained with this cavity design. The laser cavity is particularly interesting for use in high-threshold pumped gain media and eliminates some disadvantages of the SFUR and GSFUR designs. This resonator, with an effective magnification of −6.16, was applied to a pulsed Nd:YAG laser in free-running and in Q-switched modes of operation. The output energy was ~70 mJ, 5.5 times greater than when a single GSFUR design was used. The output beam had a pulse duration of ~30 ns in the Q-switched mode of operation and a beam divergence of 0.26 mrad. The required relations for the GSFUR–PBUR optical design and the output energy were derived and verified experimentally.
© 1999 Optical Society of America
[Optical Society of America ]
OCIS Codes
(140.0140) Lasers and laser optics : Lasers and laser optics
(140.3410) Lasers and laser optics : Laser resonators
(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
(140.4780) Lasers and laser optics : Optical resonators
Citation
Amir Hossein Farahbod, Bahram Daneshvar, and Akbar Hariri, "Performance of Nd:YAG Lasers in Coupled Generalized Self-Filtering and Positive-Branch Unstable Resonators," Appl. Opt. 38, 4516-4527 (1999)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-38-21-4516
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