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Proceedings Paper

Characteristics of Alexandrite Lasers In Q-Switched And Tuned Operations
Author(s): C. L. Sam; J. C. Walling; H. P. Jenssen; R. C. Morris; E. W. O'Dell
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Paper Abstract

Alexandrite is a laser crystal which is unique in that it is broadly tunable, is four-level, and has a long storage time making Q-switched operation possible. In addition the crystal is surpassed only by ruby in desirable strength and thermal properties of all practical laser crystals. A simple four-level model that describes the laser operation in alexandrite is presented. The terminal laser level in this model is a set of vibrational states well above the ground state. The initial laser level is a level 800 cm-1 above a long-lived storage level and in thermal equilibrium with it. Experimental results of Q-switched operation and tuned long pulse operation are presented, both as a function of temperature. In Q-switched operation, pulsewidths from 70 ns to 300 ns have been measured and laser efficiency increases with temperature. In tuned operation, the increase in gain with temperature is accompanied by a shift of the tuning curve to the red. Both observations are consistent with the simple model. Some laser design parameters are discussed.

Paper Details

Date Published: 31 October 1980
PDF: 7 pages
Proc. SPIE 0247, Advances in Laser Engineering and Applications, (31 October 1980); doi: 10.1117/12.959391
Show Author Affiliations
C. L. Sam, Allied Chemical Corporation (United States)
J. C. Walling, Allied Chemical Corporation (United States)
H. P. Jenssen, Allied Chemical Corporation (United States)
R. C. Morris, Allied Chemical Corporation (United States)
E. W. O'Dell, Allied Chemical Corporation (United States)

Published in SPIE Proceedings Vol. 0247:
Advances in Laser Engineering and Applications
Malcolm L. Stitch, Editor(s)

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