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

这项研究是受欢迎的追随者。A new nonlinear optical boratecrystal K - D22 - D22 - D2B - D22 - D2O - D27 - D2 was developed as an ultraviolet light generator.The structure has been established by 4-axis X-ray diffraction methods. The material crystallizes inthe trigonal space group P321 with a=8.5657 (9) a and c=8.463 (2) a . KAB possesses spacearrangement similar to Sr - D22 - D22 - D2B - D22 - D2O - D27 - D2 (SBBO) which has toxic Be atom. Byusing the Top-Seeded Solution Growth （TSSG）方法a bulky KAB crystal with a dimensions of 4×3×2 mm D13 was grown fromK - D22 - D2CO D23 - D22 - D2O - D23 - D22 - naf flux. The K - D22 - D2CO - D23 - D2 andD22 D2O D23 D2 compounds decrease the viscosity of the solution to about 1200 cP. therefractive indices at 589nm are n - D20 - D2=1.553 and n - D20 - D2=1.479 with birefringence Δn=0.074.absorption edge is down to about 180nm. effective nonlinear coefficient is similar to thatof KDP (D236 - D2=0.37pm/V)，as obtained from the powder test. Type-I phase-matching angle for第二harmonic generation of Nd：YAG laser was found to be θ=28°. These光学性能，moderate nonlinearity and birefringence, and a wide transparent range in the UV，KAB is a good candidate for frequency mixing into the UV light。

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.