光学精密工程2017，Vol.25Issue(12)：3041-3047,7.DOI:10.3788/OPE.20172512.3041
深紫外倍频用KBBF晶体光栅耦合器设计
Design of KBBF crystal grating coupler in deep ultraviolet band
摘要
Abstract
The double frequency characteristics of KBe2BO3F2 (KBBF) crystals were analyzed.A new KBBF crystal grating coupler was designed with combination of the base wave grating coupling and the total reflection properties of KBBF crystals.The design principle of KBBF crystal grating coupler was introduced.By etching diffraction grating on the surface of a KBBF crystal,the diffraction order matching with the grating was chosen to generate double frequency.The total reflection in the KBBF crystal was used to increase optical path to obtain higher frequency conversion efficiency.Then,appropriate matching types were put forward by calculating matching angle,walk—off angle,frequency factor and other parameters.And the matched grating parameters were optimized to calculate groove parameters and diffraction efficiency of grating.Moreover,grating coupler frequency conversion formulas were given and their applicable ranges were shown.Finally,crystal grating coupler based on a 5.2 mm× 5.2 mm× 1 mm KBBF crystal was fabricated,and the results indicate that the grating coupler realizes double frequency outputs in deep ultraviolet waveband and its total frequency conversion efficiency reaches 16.86％.关键词
氟硼铍酸钾晶体/深紫外非线性光学晶体/激光晶体/转化率/晶体耦合器/深紫外激光Key words
KBBF crystal/deep ultraviolet nonlinear optical crystal/laser crystal/SHG conversion/coupling device/deep ultraviolet lasers分类
数理科学引用本文复制引用
谭鑫,张嘉航,巴音贺希格..深紫外倍频用KBBF晶体光栅耦合器设计[J].光学精密工程,2017,25(12):3041-3047,7.基金项目
国家重大科研装备开发专项(No.2011YQ120023) （No.2011YQ120023）
国家自然科学基金面上项目(61675197) （61675197）
