[17a-Z32-1~7] 15.1 Bulk crystal growth

▲ [17a-Z32-5] The low-temperature liquid phase growth and nonlinear optical applications of Van der Waals crystals

〇Chao Tang¹, Tadao Tanabe², Yutaka Oyama¹ (1.Tohoku University, 2.Shibaura Inst. of Tech.)

Keywords:solution crystal growth, Van der Waals crystal, nonlinear optics

The terahertz (THz) wave has been widely applied in many fields, including medical diagnosis, high-speed communication, and non-destructive detection. The difference frequency generation (DFG) implemented with nonlinear optical crystals like GaP and GaSe can generate terahertz with high power and monochromaticity. However, the commercial GaSe crystals are grown by the Bridgman technique, which is conducted under a temperature higher than the melting point of GaSe. The defects and coexists of polytype restrict generation efficiency. In this study, the high-quality GaSe crystals have been grown from a solution whose temperature is lower than that used in the Bridgman technique. The generation efficiency increased about ten times compared with previous results.