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Self frequency doubling crystal is a kind of crystal that integrates laser and nonlinear optical effect, which can realize wavelength conversion, amplitude modulation, switch, memory and other functions, and has become widely used in photoelectronic, optical communication, laser and other fields. However, the existing crystals such as Nd∶LiNbO3 (Nd∶LN), Nd∶Na3 La9 O3 (BO3)8 (Nd∶NLBO), Nd∶La2 CaB10O19 (Nd∶LCB) have limited the further applications due to their inherent photorefractive effect, low second harmonic generation (SHG) output power, poor optical homogeneity and other shortcomings, so it is necessary to develop new laser self frequency doubling crystals. Due to the large nonlinear optics (NLO) coefficient, difficult to deliquesce, excellent optical, mechanical properties and so on, hunitite family borate crystals have become the focus of research in recent decades. In this paper, the crystal structure, growth methods, properties and development trend and other aspects of huntite family REM3 (BO3)4 (RE is rare earth elements La-Lu and Y; M is Al, Ga, Sc) and Lax REy Scz (BO3)4 (RE = Gd, Y, Nd, Lu, Sm, Tb; x + y + z =3) co-substituted borate nonlinear optical crystals are introduced emphatively. The differences of ultraviolet (UV) cut-off edge, optical properties and nonlinear properties of crystals grown by different fluxes, atmospheres and methods are compared. By improving the growth technology and doping elements, self-frequency-doubled (SFD) crystals with good optical properties, remarkable nonlinear properties and extensive market application prospects can be obtained. [ABSTRACT FROM AUTHOR]

Scintillation crystal materials can be used in the detection of X-rays, γ-rays, neutrons and other high energy particles. After more than 100 years of development, the detection and imaging technology which take scintillating crystals as the core have been widely used in nuclear medicine, high energy physics, safety inspection, industrial nondestructive inspection, space physics and nuclear prospecting. With the further research and development of scintillation crystal materials, the better halide scintillation crystals such as LaBr3: Ce on the market are gradually unable to meet the needs of development due to their high production cost, anisotropy and brittleness. At the same time, perovskite-type scintillation crystal materials have gradually entered people’s vision because of their easily improved deliquescence, lower production cost, easily adjusted growing conditions and good scintillation performance. In this paper, the crystal structure, property, growth method, development trend and application prospect of perovskite-type scintillation crystal materials ABX3 (A+ is Cs+, B2+ is part alkali-earth metal ions, X- is non-fluorine halogen ions) and K-based perovskite scintillation crystal materials are introduced emphatively. By doping some rare earth elements and improving the growth process, perovskite-type scintillation crystals with high light yield, good energy resolution and low cost can be widely used in the market. [ABSTRACT FROM AUTHOR]