基于溴化亚汞晶体的声光可调谐滤波器中声场模型与衍射效率研究  

Acoustic Field Models and Diffraction Efficiency in Acousto-Optic Tunable Filters Based on Mercurous Bromide Crystals

作　　者：赵慧洁 孙竖敬[2,4] 王诗杰 郭琦 Zhao Huijie;Sun Shujing;Wang Shijie;Guo Qi(Institute of Artificial Intelligence,Beihang University,Beijing 100191,China;School of Instrumentation and Optoelectronic Engineering,Beihang University,Beijing 100191,China;Aerospace Optical-Microwave Integrated Precision Intelligent Sensing,Key Laboratory of Ministry of Industry and Information Technology,Beihang University,Beijing 100191,China;Qingdao Research Institute of Beihang University,Qingdao 266104,Shandong,China)

机构地区：[1]北京航空航天大学人工智能研究院,北京100191 [2]北京航空航天大学仪器科学与光电工程学院,北京100191 [3]北京航空航天大学“空天光学-微波一体化精准智能感知”工业和信息化部重点实验室,北京100191 [4]北京航空航天大学青岛研究院,山东青岛266104

出　　处：《光学学报》2024年第16期302-310,共9页Acta Optica Sinica

摘　　要：声学各向异性引起的声场强度及相位分布变化对衍射效率的影响不可忽略。提出了一种利用角谱法进行声场建模的方法,然后利用耦合波法计算声场分布下的光学衍射效率,并将其与实验数据进行对比验证,结果证明了该建模方法可作为计算工具,为溴化亚汞晶体在中长波谱段声光互作用计算提供声场数据。Objective An acousto-optic tunable filter(AOTF)possesses significant advantages,including rapid wavelength switching,continuous tuning of the central wavelength,and flexible operation,making them widely utilized in spectral spectroscopic detection.Current commercial AOTF products employ tellurium dioxide crystals as the acousto-optic medium,with an operational spectral range limited to 4.5μm due to the crystal’s transparency range.In contrast,mercurous bromide crystals exhibit a higher transmission rate across the visible to the far-infrared spectrum(0.5‒30μm)and possess excellent acousto-optic performance.Therefore,researching the acoustic and optical field modeling within mercurous bromide crystals is of significant importance.Both tellurium dioxide and mercurous bromide crystals exhibit strong acoustic and optical anisotropy.While theoretical analysis of the impact of optical anisotropy on diffraction efficiency in acousto-optic devices has been progressively refined,the influence of acoustic anisotropy has been largely confined to considerations of the deviation in sound energy direction.Changes in sound field intensity and phase distribution caused by acoustic anisotropy have a non-negligible effect on diffraction efficiency that cannot be ignored.This paper proposes a method for acoustic field modeling using the angular spectrum approach,followed by the calculation of optical diffraction efficiency under the sound field distribution with the coupled wave method.The results provide acoustic field data for the computation of acousto-optic interactions in mercurous bromide crystals across the mid-long wave spectral region.Methods We utilize the angular spectrum method to construct an analytical model of the sound field,building a calculation model applicable to mercurous bromide and tellurium dioxide crystals,considering their acoustic anisotropy.This method achieves the distribution of the sound field within the mercurous bromide crystal and numerically iterates the diffracted light energy at any positi

关 键 词：声光可调谐滤波器 中长波红外 溴化亚汞 声场分布 

分 类 号：O436[机械工程—光学工程]