Development of new nonlinear optical crystal KィイD22ィエD2AlィイD22ィエD2BィイD22ィエD2OィイD27ィエD2 for vacuum ultra-violet light generation

results obtained in this resManagement are summarized as followings。A new nonlinear optical borate crystalD22 y D22 y D22 y D22 y D22 y D27 y D2 was Oracle ed as an ultraviolet light generator。该结构是由4轴X射线衍射方法证实的。在trigonal space group P321中的物质crystallizes with a=8.5657 （9）和c=8.463 （2）。KAB possesses space arrangement similar to Sr-D22-D2B-D22-D2O-D27-D2 （SBBO） which has toxic Be atom。By using the Top-Seeded Solution Growth （TSSG） method， a bulky KAB cr\with a dimensions of 4×3×2 mm的D13 was grown from K22的D2-B的D22的D2O的D23的D2-NaF flux。D22 D2CO D23 D2 and B D22 D2O D23 D2 compounds decrease the viscosity of the solution to about 1200 cP。The refractive indices at 589 nm are n y D20 y D2=1.553 and n y D20 y D2 =1.479 with birefringence Δn=0.074。吸收边缘下降到大约180纳米。effective nonlinear coefficient is similar to that of KDP （D236）， as obtained from the powder test。第二代Nd谐波一代的I型相位匹配角度： YAG激光器找到了θ=28°。这些光学特性，中等的非线性和双红外线，以及紫外线上的宽透射范围，显示KAB是紫外线上频率混合的好候选人。

The results obtained in this research are summarized as followings.A new nonlinear optical borate crystal KィイD22ィエD2AlィイD22ィエD2BィイD22ィエD2OィイD27ィエD2 was developed as an ultraviolet light generator. The structure has been established by 4-axis X-ray diffraction methods. The material crystallizes in the trigonal space group P321 with a=8.5657 (9) Å and c=8.463 (2) Å. KAB possesses space arrangement similar to SrィイD22ィエD2BeィイD22ィエD2BィイD22ィエD2OィイD27ィエD2 (SBBO) which has toxic Be atom. By using the Top-Seeded Solution Growth (TSSG) method, a bulky KAB crystal with a dimensions of 4×3×2 mmィイD13ィエD1 was grown from KィイD22ィエD2COィイD23ィエD2-BィイD22ィエD2OィイD23ィエD2-NaF flux. The KィイD22ィエD2COィイD23ィエD2 and BィイD22ィエD2OィイD23ィエD2 compounds decrease the viscosity of the solution to about 1200 cP. The refractive indices at 589 nm are nィイD20ィエD2=1.553 and nィイD20ィエD2=1.479 with birefringence Δn=0.074. The absorption edge is down to about 180nm. The effective nonlinear coefficient is similar to that of KDP (dィイD236ィエD2=0.37pm/V), as obtained from the powder test. Type-I phase-matching angle for second-harmonic generation of Nd : YAG laser was found to be θ=28°. These optical properties, moderate nonlinearity and birefringence, and a wide transparent range in the UV, show that KAB is a good candidate for frequency mixing into the UV light.