The development of nonlinear optical crystal profiles were analysed

With the deepening of the nonlinear optics research and development of new materials, nonlinear optical crystal materials in information and communication, image processing, laser diode, optical signal processing and optical computing, and many other fields has a very important role and the huge potential application, the research and application of nonlinear optical crystal and put forward more higher physical and chemical performance requirements, many applications at the same time also in the endless development.

a overview of nonlinear optical crystal,

1. We will have effect of frequency conversion, heat-lens effect of crystal electro-optic effect and light are collectively referred to as nonlinear optical crystal.

　　2. The classification of the nonlinear optical crystal

( 1) The classification method of nonlinear optical crystal is differ, in terms of crystal optical classification can be divided into optical homogenate, single optical axis crystal, and biaxial crystals. The optical property mainly for the cubic crystal system crystal; Single optical axis crystal mainly for trigonal system, tetragonal, hexagonal crystal, is characterized by high there was only one time axis of symmetry; Biaxial crystal to orthorhombic system, monoclinic system, triclinic crystal system crystals, is characterized by no high time axis of symmetry, and there are two axis.

　　( 2) If sort them out according to crystal effect produced by the laser frequency conversion can be divided into three classes of crystal, choosing crystal electro-optic crystal and light.

　　( 3) If can be divided by specific provisions of chemistry to inorganic nonlinear optical crystal and organic nonlinear optical crystal. Inorganic and organic nonlinear optical crystal to assemble the whole nonlinear optical crystal area of research.

the following from the chemical point of nonlinear optical crystal and its development situation.

2, inorganic nonlinear optical crystal inorganic nonlinear optical crystal is the research to the earlier of the nonlinear optical materials, can be roughly divided into

( 1) Inorganic crystals, including boric acid salt, phosphate, iodate, niobium acid salt, titanate salt crystals;

　　( 2) Semiconductor type nonlinear optical crystal, such as, Se, Te, GaAs, ZnSe, CdGeAs2 and CdGe ( As1 - 2xP) 2, etc.

with the development of laser science and technology, in terms of frequency conversion, inorganic nonlinear optical crystal materials play an increasingly important role, especially in the uv and deep ultraviolet spectrum area. Compounds in recent years, as a result of boric acid salt have rich structure types, and many of borate crystals have wide through the band, high damage threshold and stable physical and chemical properties, moderate birefringence etc, people gradually think of looking for new type nonlinear optical crystal focus only on the boric acid salt compounds. BBO, LBO, CLBO and KBBF, SBBO, YCOB series crystal are all in the last century the nineties, found that the performance of boric acid salt crystals of borate system in recent years, people continue to a large number of exploration, and made greater progress, have found a large number of excellent performance of nonlinear optical crystal, and crystal of them and have previously found that a lot of growth and performance study, such as NaLa9O3 ( BO3) 8、LiKB4O7、Na3Sm2( BO3) 3, TBO, BABF, LiRbB4O7 lead, barium borate, KBBF, ZBP high quality nonlinear optical material. In laser frequency doubling, electro-optic modulation, parametric oscillation holographic storage, real time, and many other fields has a broad application prospect. Therefore, the further study of borate system has important practical application value.

coordinating editor li jie

China industry research network