Flux growth of nonlinear optical crystal K3B6O10Br with high optical quality and its electro-optical property

Nonlinear optical (NLO) crystal, simultaneously exhibits second-harmonic generation response and linear electric-optical (EO) susceptibility, is of great significance for optoelectronics due to its frequency extension technique and optical modulation effect. In this paper, the growth system of K 3 B 6 O 10 Br (KBB) crystal in the green-flux K 2 MoO 4 –KBF 4 was systematically investigated to get rid of the non-intrinsic absorption in the ultraviolet wavelength range, which is beneficial for high-power applications. Bulk KBB NLO crystals were successfully grown by the top-seeded solution growth method from different fluxes for comparison. Moreover, the electro-optical (EO) property of KBB crystal was explored, and the effective EO coefficient γ 22 along transverse modulation was determined to be 1.10 p.m./V.