摘要
声光可调谐滤波器(Acousto-Optic Tunable Filter,AOTF)是一种基于声光效应的色散器件,通过改变超声频率的大小,可以使光的衍射方向发生变化,从而进行波长选择。本研究设计了一种新的双程色散AOTF结构,并利用有限元分析软件对其滤波特性展开研究。研究结果表明,这种双程色散AOTF的设计可以有效地压缩光谱线宽,当中心波长为1064 nm时,在超声工作频率为84 MHz的情况下,线宽压缩效率达到了28.6%,明显提高了光谱分辨率;同时,这种结构还具有较强的抑制旁瓣效果,可以将中心波长为1064 nm的衍射光的旁瓣从-27.0 dB压缩至-44.8 dB,提高了光谱纯净度。
Acousto-Optic Tunable Filter(AOTF)is a dispersive element based on acousto-optic effect.By changing the ultrasonic frequency,the diffraction direction of the light can be changed,so as to select the wavelength.In this study,a new two-pass dispersive AOTF structure is designed and studied using finite element analysis software.The results of the present study show that the design of this dual-range dispersive AOTF can effectively compress the spectral linewidth.When the center wavelength is 1064 nm,the linewidth compression efficiency reaches 28.6%at an ultrasonic operating frequency of 84 MHz,which indicates that the spectral resolution has been significantly improved;at the same time,this structure also has a strong inhibition of sidelobes,which can compress the sidelobes of the diffracted light with a center wavelength of 1064 nm from-27.0 dB to-44.8 dB,which improves the spectral purity.
作者
庞亚军
姚美菱
张锴
白振旭
PANG Yajun;YAO Meiling;ZHANG Kai;BAI Zhenxu(Center for Advanced Laser Technology,Hebei University of Technology,Tianjin 300401,China;Hebei Key Laboratory of Advanced Laser Technology and Equipment,Tianjin 300401,China;Shijiazhuang Posts and Telecommunications Technical College,Shijiazhuang 050021,China)
出处
《激光杂志》
CAS
北大核心
2024年第2期13-17,共5页
Laser Journal
基金
国家自然科学基金(No.61905063,61905061)
河北省自然科学基金(No.F2020202055,F2019202337)。
关键词
声光衍射
声光效应
双程色散
有限元分析
光谱分辨率
acousto-optic diffraction
acousto-optic effect
double-pass dispersion
finite element analysis
spectral resolution
