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Measurement of multiphoton absorption and electron avalanche in optical thin films

Published online by Cambridge University Press:  09 March 2009

H. Nishioka
Affiliation:
Institute for Laser Science, University of Electro-Communications, 1–5–1 Chofugaoka, Chofu, Tokyo 182, Japan
T. Kawasumi
Affiliation:
Institute for Laser Science, University of Electro-Communications, 1–5–1 Chofugaoka, Chofu, Tokyo 182, Japan
K. Ueda
Affiliation:
Institute for Laser Science, University of Electro-Communications, 1–5–1 Chofugaoka, Chofu, Tokyo 182, Japan
H. Takuma
Affiliation:
Institute for Laser Science, University of Electro-Communications, 1–5–1 Chofugaoka, Chofu, Tokyo 182, Japan

Abstract

Measurements on nonlinear processes caused by multiphoton absorption and electron avalanche in optical thin films have been carried out using KrF lasers of 20-ns and 1.7-ps pulse duration. Multiphoton absorption of the order of 10-7 J was detected by a photoacoustic signal, and the nonlinear growth of photo-induced current due to the electron avalanche was analyzed dynamically. The correlation between damage threshold and carrier lifetime was investigated for oxide and fluoride coatings.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1993

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References

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