SEDL / STP / STP799-EB / STP37237S

Reversible and Irreversible Changes in NaCl and KCl Absorption During Multiple Pulse 10.6 μm Irradiation

Wu, S-T
Center for Laser Studies University of Southern California, Los Angeles, CA

Bass, M
Center for Laser Studies University of Southern California, Los Angeles, CA

Stone, JP
Center for Laser Studies University of Southern California, Los Angeles, CA

Pages: 8    Published: Jan 1983

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Abstract

Repetitively pulsed laser calorimetry was used to detect both reversible and irreversible increases in the 10.6 μm absorption of NaCl and KCl. The irreversible changes are first noted at the same intensity that is found to cause damage after multiple irradiations. Just below this intensity damage is not detected even after ∼1800 pulses. As a result of this work, a redefinition of the fatigue threshold is necessary as it must be distinguished from the breakdown damage threshold studied in earlier research.