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Optical breakdown in wide-band-gap material as function of pulse duration

D. Du, X. Liu, G. Korn, J. Squier, and G. Mourou

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Abstract

The phenomena of optical breakdown of normally transparent optical materials such as fused silica has been studied for three decades[1]-[3]. Through the nonlinear photon-matter interaction (electron avalanche process or multiphoton ionization), a plasma is generated at the focal spot and laser energy is deposited to material, which heats the material that can lead to the irreversible damage to the material. The breakdown threshold is pulse-width dependent, and an empirical scaling law of breakdown threshold exists: Fth, ~ τ1/2, for pulse duration greater than 10 ps.

© 1994 Optical Society of America

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