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Multiple pulse laser-induced damage phenomena in silicates.

D Kitriotis, L D Merkle

|June 16, 2010

Summary

Laser pulses can damage glass, with damage increasing with repeated exposure. This study suggests transient defects, not inclusions, cause this cumulative laser-induced bulk damage in silica and borosilicate glass.

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Area of Science:

Materials Science
Optics and Photonics
Laser Physics

Background:

Understanding laser-induced damage is crucial for optical material applications.
Multiple laser pulse interactions can lead to cumulative damage effects.

Purpose of the Study:

Investigate multiple pulse laser-induced bulk damage in fused silica and borosilicate glass.
Determine the influence of laser parameters and pre-existing defects on damage accumulation.

Main Methods:

Experimental study of laser-induced bulk damage.
Analysis of fluence and pulse repetition frequency dependence.
Luminescence experiments to probe pre-damage conditions.

Main Results:

Damage exhibits clear fluence and pulse repetition frequency dependence, indicating damage promotion.
Transient entities like point defects are favored over inclusions as the cause.
Pre-irradiation defects have minimal impact on damage thresholds.

Conclusions:

Laser irradiation facilitates subsequent damage, likely via transient defect accumulation.
Low concentrations of conduction band electrons are inferred before damage.
The findings constrain potential mechanisms for multiple laser pulse damage.

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