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Abstract: High quality nonlinear infrared crystal material GaSe was grown using a seed aided Bridgman–Stockbarger method having a size of 24–26mm in diameter and 55–70mm in length. The crystals were characterized using X-ray diffraction, electron energy scattering, transmission spectrophotometry and infrared microscopy. The transmission spectrum showed that the infrared transmission is about 67% in an 8mm thick sample cleaved along (001) face, and mean absorption 0.01–0.08cm−1 in the range 0.9–15μm. It may be suitable for the fabrication of infrared nonlinear optical devices, photoelectric analyzers of polarized light and so on. Crystals grown by this method with the described procedures may also be useful for other similar layered compounds. [Copyright &y& Elsevier]

• Polycrystalline sample of BGSe was synthesized by high pressure method firstly. • High quality BGSe single crystal with dimensions of Φ40 mm × 180 mm was grown. • The absorption coefficient of a 2.5 mm thick device is 0.017 cm−1@4 μm. • The laser damage threshold was measured to be 7.075 J/cm2 using a 1.064 μm laser. BaGa 4 Se 7 (BGSe), as a promising new infrared nonlinear optical (IR NLO) crystal, has been widely studied in recent years due to its outstanding overall properties and IR laser output performance. In this paper, the synthesis method of polycrystalline sample and the temperature field used in crystal growth of BGSe were improved. More than 200 g BGSe polycrystalline sample can be synthesized by high pressure synthesis in just 2 days. The crystal growth temperature field can be designed with the use of COMSOL MultiphysicsTM simulation software, and the experimental results fit well with the simulation results. A high-quality crystal with dimensions up to Φ40 mm × 180 mm was grown successfully by the Bridgman-Stockbarger method. The surface laser damage threshold was measured to be 7.075 J/cm2 (peak on-axial fluence) using a 1.064 μm laser under conditions of 5 ns pulse width, 1 Hz frequency, and 0.12 mm spot size. The absorption coefficient was 0.017 cm−1@4 μm for an uncoated sample. [ABSTRACT FROM AUTHOR]