Kyropoulos growth of a 300 g SrB₄O₇ single crystal using a twin-type stirring blade

Abstract

We report the successful Kyropoulos growth of a large strontium tetraborate (SrB4O7, 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 a 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.

Crystallization of SrB4O7 in a glass tape and its electrical, dielectric, ferroelectric and nonlinear optical properties

“…It was demonstrated that the crystal also had the highest surface acoustic wave velocity among piezoelectric crystals [10]. From the point of view of practical applications, note that a large single crystal of SBO with a weight of more than 300 g and transparency down to 130 nm can be grown [11]. Besides, SBO is a promising material for optical pressure sensors.…”