Defect characterization on superpolished fused silica surfaces polished for high-power-laser applications at 355 nm (Abstract Only)

Lynn Matthew Sheehan; Zhouling Wu

doi:10.1117/12.344418

7 April 1999 Defect characterization on superpolished fused silica surfaces polished for high-power-laser applications at 355 nm (Abstract Only)

Lynn Matthew Sheehan, Zhouling Wu

Author Affiliations +

Proceedings Volume 3578, Laser-Induced Damage in Optical Materials: 1998; (1999) https://doi.org/10.1117/12.344418
Event: Laser-Induced Damage in Optical Materials: 1998, 1998, Boulder, CO, United States

Abstract

Laser damage threshold of super-polished fused silica at 355-nm is believed to be limited by localized defects associated with surface/substrate damage and contamination caused by the polishing process. Characterization of both the defects and their correlation with laser damage present a technical challenge: most of the existing characterization methods do not directly address absorption and thermo- mechanical response issues relevant to laser damage. In this work a dark-field photothermal microscopy (DPTM) with micron-level resolution is used for localization and identification of damage precursors for various fused silica surfaces. The experimental system uses the multiple UV lines from an Argon-ion laser. The samples studied are witness fused silica samples from various polishing vendors. In addition to DPTM, some of the samples are also studied using high-resolution optical microscopy and total internal reflection microscopy. The characterization result are then compared with laser damage testing data at 355-nm with a 7.5-ns pulse width. It is shown that while the DPTM data ca be correlated between damaged sites and DPTM defects is not obvious.

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Lynn Matthew Sheehan and Zhouling Wu "Defect characterization on superpolished fused silica surfaces polished for high-power-laser applications at 355 nm (Abstract Only)", Proc. SPIE 3578, Laser-Induced Damage in Optical Materials: 1998, (7 April 1999); https://doi.org/10.1117/12.344418

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KEYWORDS

Silica

Polishing

Laser induced damage

Surface finishing

Microscopy

Laser damage threshold

Absorption

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