Kyropoulos growth of a 300 g SrB4O7 single crystal using a twin-type stirring blade. (1st July 2022)

• Record Type: Journal Article
• Authors: Tanaka, Yasunori; Murai, Ryota; Takahashi, Yoshinori; Empizo, Melvin John F.; Usami, Shigeyoshi; Maruyama, Mihoko; Imanishi, Masayuki; Mori, Yusuke; Yoshimura, Masashi
• Is Part Of: Japanese journal of applied physics. Volume 61:Number 7(2022)
• Publication Date: 2022-07-01
• Subjects: kyropoulos growth -- strontium tetraborate -- stirring blades -- DUV laser; Physics -- Periodicals; 621.05
• DOI: 10.35848/1347-4065/ac6f35
• Languages: English
• ISSNs: 0021-4922

Abstract

Abstract: We report the successful Kyropoulos growth of a large strontium tetraborate (SrB4 O7, SBO) single crystal that weighs more than 300 g. In order to grow the large and transparent crystal, a new twin-type stirring blade was used along with a 150 mm diameter crucible. The use of the stirring blade results in the production of the world's largest SBO crystal with dimensions of 100 mm ( a ) ×30 mm ( b ) ×32 mm ( c ), a weight of 328.2 g, and wide transparency down to 130 nm. These results will then lead to the development of large SBO crystals as optical window materials for high-power DUV laser processing systems.