A Modified Vertical Bridgman Method for Growth of GaSe Single Crystal

As growing e-GaSe single crystal, volatile component and curving solidification interface spoil the qualities of crystals. The GaSe single crystal in φ19 mm×65 mm size was grown by modified vertical Bridgman method. The crystallinity and optical properties of as-grown crystals were measured by XRD and transmission spectra, respectively. The FT-IR meas- urements indicated wide transparency over the spectral range (0.65-16 μm) and low absorption coefficient (<0.3 cm -1 ) in The e-GaSe single crystal is an attractive nonlinear optical crystal. Compared to other infrared nonlinear opti- cal crystals, it is characterized by large nonlinear coeffi- cient (d22=70-80 pm/V), lower absorption coefficient and large birefringence (0.35), wide transparency range (0.6- 18 μm), which determines its potential applications in broader tunable output laser