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Proceedings Paper

Thermal Runaway In Laser-Heated Mirrors With Temperature-Dependent Absorptance
Author(s): M. Sparks; R. Warren; E. Loh
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Paper Abstract

A review of reflectors with temperature-dependent absorptance shows that above a critical irradiance, exponential thermal runaway occurs, while below it, the temperature rise approaches either a steady-state value or a slowly increasing value. Calculated damage thresholds, which are generally reduced substantially when the temperature dependence of the absorptance is included, fail to agree with experimental values in most cases because isolated-spot damage or plasma formation occurs. However, excellent agreement is obtained for special ion-cleaned or diamond-turned samples, which damage uniformly for long (~100 ns) pulses.

Paper Details

Date Published: 24 January 1980
PDF: 6 pages
Proc. SPIE 0198, Laser Applications in Materials Processing, (24 January 1980); doi: 10.1117/12.958025
Show Author Affiliations
M. Sparks, Pacific-Sierra Research Corporation (United States)
R. Warren, Pacific-Sierra Research Corporation (United States)
E. Loh, Pacific-Sierra Research Corporation (United States)


Published in SPIE Proceedings Vol. 0198:
Laser Applications in Materials Processing
John F. Ready, Editor(s)

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