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Proceedings Paper

Role of UV illumination for enabling cold temperature operation of a LiNbO3 Q-switched Nd:YAG laser
Author(s): Brian Cole; Vernon King; Jeff Leach; Lew Goldberg
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Paper Abstract

We have explored using UV illumination as a method to mitigate pyroelectric effects, and their associative loss in hold-off for lithium niobate Q-switch materials under cold temperature operation. It has been observed that by illumination of the LiNbO3 Q-switch material from the side, the above bandgap light can provide for an increase in conductivity via an increase in photocarriers. In the presence of strong pyroelectric fields associated with a change in temperature, these carriers can be effectively swept in the direction to eliminate the field. We quantified the improvement in conduction by measuring the decay time for the pyroelectric induced loss in extinction. At negative 20°C, the decay rate for the pyroelectric field in the absence of UV illumination was measured to be 16.7 hours. It was found that by illuminating the LiNbO3 from the side with two UV LEDs operating at 500mA, the decay constant for a built-up pyroelectric charge could be reduced to 1minute. With this technique applied to a LiNbO3 Q-switched laser, the laser was shown to perform over rapid cooling without a degradation in performance.

Paper Details

Date Published: 3 March 2011
PDF: 6 pages
Proc. SPIE 7912, Solid State Lasers XX: Technology and Devices, 791224 (3 March 2011); doi: 10.1117/12.873935
Show Author Affiliations
Brian Cole, U.S. Army RDECOM CERDEC (United States)
Vernon King, U.S. Army RDECOM CERDEC (United States)
Jeff Leach, U.S. Army RDECOM CERDEC (United States)
Lew Goldberg, U.S. Army RDECOM CERDEC (United States)

Published in SPIE Proceedings Vol. 7912:
Solid State Lasers XX: Technology and Devices
W. Andrew Clarkson; Norman Hodgson; Ramesh Shori, Editor(s)

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