Laser-induced bulk damage of various types of vitreous silica

Kuzuu, Nobu; Umemura, Nobuhiro; Nagafuchi, A.; Yagi, K.; Ochi, Kanyoshi; Yoshida, Kunio

doi:10.1117/12.379299

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Multi-shot Laser Damage Data1

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2002

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“…The low threshold of BK7 and Suprasil for damage within 1000 shots is found to reduce about 30% to 40% compared with the single shot threshold. These results are consistent with other studies in similar materials [13,14,8].…”

Section: Multi-shot Laser Damage Datasupporting

confidence: 94%

Statistical study of single and multiple pulse laser-induced damage in glasses

Gallais¹,

Natoli²,

Amra³

2002

Opt. Express

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Single and multiple pulse laser damage studies are performed in Suprasil silica and BK-7 borosilicate glasses. Experiments are made in the bulk of materials at 1.064microm with nanosecond pulses, using an accurate and reliable measurement system. By means of a statistical study on laser damage probabilities, we demonstrate that the same nano-precursors could be involved in the multiple shot and single shot damage process. A damage mechanism with two stages is then proposed to explain the results. Firstly, a pre-damage process, corresponding to material changes at a microscopic level, leads the precursor to a state that can induce a one-pulse damage. And secondly a final damage occurs, with a mechanism identical to the single shot case. For each material, a law is found to predict the precursor life-time. We can then deduce the long term life of optical elements in high-power laser systems submitted to multipulse irradiation.

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Section: Multi-shot Laser Damage Datasupporting

confidence: 94%