基于动量匹配的声光滤波器设计与性能分析  

Design and Performance Evaluation of an AOTF Based on Momentum Match Condition

作　　者：王号[1] 黄峻峰[1] 张春光[1] 高强[1] 

机构地区：[1]福建师范大学光电与信息工程学院,福建省光子技术重点实验室,医学光电科学与技术教育部重点实验室,福建福州350007

出　　处：《中国激光》2015年第6期325-329,共5页Chinese Journal of Lasers

基　　金：国家自然科学基金(61107092);教育部长江学者和创新团队发展计划(IRT1115);福建师范大学青年骨干教师资助计划(fjsdjk2012055)

摘　　要：声光滤波技术作为一种新的分光手段在光谱成像等领域有着广阔的应用前景。高性能声光滤波器的设计与制作是声光滤波技术的核心关键。从声光相互作用的基本理论出发,研究了声光作用过程中动量失配量对声光滤波器衍射效率的影响。并进一步分析了声光滤波器的角孔径以及衍射线宽的变化规律。研究结果表明,声光滤波器的调谐关系随入射光角度的变化而变,在确定入射光角度的情况下,衍射光波长和超声波频率一一对应。另外,随着入射光角度的变化,衍射光的波长发生变化的同时,其线宽以及角孔径发生明显变化,通过调整入射光的角度可以相应改变衍射光的线宽,实现窄带的声光滤波,提高声光滤波器的光谱分辨本领,也可以调整入射光的角度获得较大的角孔径,提高滤波器的集光能力。理论的计算结果与实验结果符合的较好。研究结果对高性能声光滤波器的设计提供有意义的借鉴和参考,并推动声光滤波技术更广泛应用。As a method for light-filtering, acousto-optic tunable filter （AOTF） has wide application prospect. Design and manufacture of high-performance AOTF are key part of this tech. In this work, based on the momentum mismatch, the diffracted efficiency of an AOTF is calculated. Also the relations between momentum mismatch and band-pass and aperture are investigated. The results demonstrated that the tune relation of an AOTF changed with the incident angle of light and the diffracted wavelength is decided by acoustic wave at a fixed incident angle of light. Otherwise, the aperture and band-pass of an AOTF changed with the incident wavelength; we can acquire narrow band-pass and big aperture with a proper incident angle. The theoretical calculations are in agreement with experimental results. This research will be helpful for the design of an AOTF with good performance.

关 键 词：光学器件 声光滤波器 TeO2 动量失配 旋光性 

分 类 号：O439[机械工程—光学工程]