Bulk laser-induced damage resistance of SrB4O7 single crystals under 266 nm DUV laser irradiation. (1st May 2022)

• Record Type: Journal Article
• Authors: Maegaki, Yutaka; Tanaka, Yasunori; Marui, Haruki; Koizumi, Atsushi; Tanaka, Kota; Kamimura, Tomosumi; Murai, Ryota; Takahashi, Yoshinori; Empizo, Melvin John F.; Usami, Shigeyoshi; Imanishi, Masayuki; Maruyama, Mihoko; Mori, Yusuke; Yoshimura, Masashi
• Is Part Of: Japanese journal of applied physics. Volume 61:Number 5(2022)
• Publication Date: 2022-05-01
• Subjects: DUV laser -- SrBamp;amp;lt;subamp;amp;gt;4amp;amp;lt;/subamp;amp;gt;Oamp;amp;lt;subamp;amp;gt;7amp;amp;lt;/subamp;amp;gt; -- laser-induced damage -- optical material; Physics -- Periodicals; 621.05
• DOI: 10.35848/1347-4065/ac61f5
• Languages: English
• ISSNs: 0021-4922

Abstract

Abstract: The bulk laser-induced damage threshold (LIDT) of a strontium tetraborate (SrB4 O7, SBO) single crystal has been measured for the first time. Single-shot and multi-shot tests are carried out using a 266 nm deep ultraviolet (DUV) laser. Under single-shot irradiation, the bulk LIDT of SBO crystal is 1.5 times higher than that of synthetic silica glass. On the other hand, under multi-shot irradiation, the bulk LIDT of SBO is also higher than synthetic silica glass regardless of the number of shots. When the number of shots increased from 10 2 to 10 4, SBO crystal's bulk LIDT has only decreased by less than 11% compared to 44% of synthetic silica glass. Although the damage mechanism of SBO crystal under multi-shot irradiation is considered to be due to material modification fatigue, SBO single crystals are found to be excellent optical materials that exhibit bulk laser-induced damage resistance in the DUV region.