大孔径可见光声光可调滤光器  

Large Aperture Visible Light Acousto-optic Tunable Filter

作　　者：王晓新[1] 张泽红[1] 刘玲[1] 周益民[1] 吴中超[1] WANG Xiaoxin;ZHANG Zehong;LIU Ling;ZHOU Yimin;WU Zhongchao(The 26th Institute of China Electronics Technology Group Corporation,Chongqing 400060,China)

机构地区：[1]中国电子科技集团公司第二十六研究所

出　　处：《压电与声光》2019年第5期635-638,共4页Piezoelectrics & Acoustooptics

摘　　要：为了提高光谱成像系统的通光能量,该文介绍了一种可见光波段的大孔径(20 mm×20 mm)声光可调滤光器,与常用声光可调滤光器(光孔径10 mm×10 mm)相比,其光通量提高了3倍。该文还首次推导了包含声波衰减系数、工作频率、光到换能器距离的声光可调滤光器衍射效率公式。根据这个公式可以更准确地计算出声光可调滤光器的衍射效率。实验表明,这种双换能器声光可调滤光器工作带宽接近0.95个倍频程,滤光范围为0.4~0.9μm,衍射效率大于60%,光谱分辨率小于10 nm。In order to improve the light energy of spectral imaging system,a visible light AOTF with light aperture of 20 mm×20 mm is presented in this paper.Compared with the common AOTF(light aperture of 10 mm×10 mm),its light flux is increased by three times.In this paper,the diffraction efficiency formula of AOTF including the attenuation coefficient of sound wave,operating frequency and the distance from light to transducer is also derived for the first time.The diffraction efficiency of AOTF can be calculated more accurately by using this foumula.The experimental results show that the AOTF with two transducers has a operating bandwidth of nearly 0.95 octave,filtering range 0.4μm to 0.9μm,diffraction efficiency of greater than 60%,spectral resolution of less than 10 nm.

关 键 词：声光可调滤光器 光孔径 光谱范围 衍射效率 光谱分辨率 

分 类 号：TN65[电子电信—电路与系统] TM23[一般工业技术—材料科学与工程]