2003 Fiscal Year Final Research Report Summary
Research on new frequency convesion crystal BABF for vacuum ultraviolet light generation
| Project/Area Number |
14350034
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Applied optics/Quantum optical engineering
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| Research Institution | Osaka University |
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Principal Investigator |
SASAKI Takatomo Osaka University, School of Engineering, Professor, 大学院・工学研究科, 教授 (50029237)
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| Co-Investigator(Kenkyū-buntansha) |
YOSHIMURA Masashi Osaka University, School of Engineering, Assistant Professor, 大学院・工学研究科, 助手 (60314382)
MORI Yusuke Osaka University, School of Engineering, Associate Professor, 大学院・工学研究科, 助教授 (90252618)
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| Project Period (FY) |
2002 – 2003
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| Keywords | nonlinear optical crystal / BABF / crystal structure / crystal growth / frequency conversion / ultraviolet light generation / borate compound / solution growth |
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| Research Abstract |
We have discovered a new nonlinear optical (NLO) alumino-borate BaAlBO_3F_2 (BABF) crystal. Its structure has been characterized by 4-axis X-ray diffraction. BABF, the material, crystallizes in the space group P6^^with a = 4.8879(6) Å, c = 9.403(1) Å and Z = 2. BABF structure is an ideal structural model for producing larger SHG coefficients, wide transparent region and moderate birefringence. BABF has a structure similar to that of KBe_2BO_3F_2 (KBBF), but does not contain toxic elements in its composition. BABF crystal is easier grown than KBBF and the growth period of BABF are relative shorter than other nonlinear borate crystals. BABF crystal can be grown with dimensions of 15 x15 x 3.5mm^3. BABF crystal possesses good chemical and mechanical and optical properties, but the quality of BABF crystal needs to be improved and the effort in this direction is underway. We have obtained a transparent BABF crystal for the measurements of its linear and nonlinear optical properties. The UV absorption edge of BABF s very short (165nm). BABF was found to have powder second harmonic generation (SHG) efficiency about twice than that of KH_2PO_4 (KDP). The d_<11>(0.165pm/V) and d_<22> (1.32pm/V) were calculated. Type-1 SHG d_<eff> is about 28% higher than that of LBO and Type-1 THG d_<eff> is 31% higher than that of LBO. It exhibits that BABF is an excellent candidate for frequency mixing into the ultraviolet.
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