基于二氧化碲晶体的窄带声光滤波技术研究

发布时间：2018-05-07 12:05

本文选题：光学器件 + 声光可调滤波器　；参考：《福建师范大学》2015年硕士论文

【摘要】：声光可调滤波器(AOTF)是一种新型分光器件,它可以实现对光信号的快速电调谐。与传统的分光器件相比,AOTF具有许多独特的优点,例如体积小巧；孔径角大；采用电信号进行调节,调谐灵活迅速和衍射效率高等。正是由于这些优点,使得它被广泛应用于光谱成像、光谱分析以及光通信等相关领域。基于二氧化碲晶体制成的AOTF是一种非共线型AOTF,与共线型AOTF相比,其光谱分辨率会有所降低。而光谱分辨率是评价AOTF性能的一个重要性能指标,将直接决定着对于目标光谱的识别、分析和检测能力。因此,研究提高非共线AOTF光谱分辨率的有效方法,是非共线AOTF相关研究的重点和关健,也是AOTF得到广泛应用的需要。本文将以自主设计的基于二氧化碲晶体的窄带AOTF为研究对象,完成了不同入射光方向对AOTF性能影响和双晶体二次滤波的性能分析两部分研究。不同入射光方向的声光滤波研究表明随着入射光极角的增大AOTF的光谱分辨率将有逐渐增大的趋势；双晶体二次滤波的研究结果表明该方法可以有效抑制衍射光谱信号的旁瓣其抑制量达到9.5570 dB-13.2407dB,可使AOTF的光谱分辨率提高40.4%-83.2%,这说明基于AOTF的双晶体二次滤波技术在提高AOTF的光谱分辨率和抑制衍射信号旁瓣方面有着突出的优势。
[Abstract]:AOTFF (Acousto-Optic tunable filter) is a new type of optical spectrometer, which can realize fast electric tuning of optical signal. AOTF has many unique advantages compared with traditional spectroscopic devices, such as small size, large aperture angle, fast tuning and high diffraction efficiency. Because of these advantages, it is widely used in spectral imaging, spectral analysis, optical communication and other related fields. AOTF based on tellurium dioxide crystal is a kind of non-collinear AOTF.The spectral resolution of AOTF is lower than that of collinear AOTF. Spectral resolution is an important performance index to evaluate the performance of AOTF, which will directly determine the ability of target spectrum recognition, analysis and detection. Therefore, the research on the effective method to improve the spectral resolution of non-collinear AOTF is the focus and key of the research on non-collinear AOTF, and it is also the need for AOTF to be widely used. In this paper, the effect of different incident light directions on the performance of AOTF and the performance analysis of double crystal secondary filter are completed by taking the self-designed narrow-band AOTF based on tellurium oxide crystal as the research object. The study of acousto-optic filter with different incident light direction shows that the spectral resolution of AOTF will increase gradually with the increase of incident light pole angle. The results of double crystal quadratic filtering show that this method can effectively suppress the sidelobe of diffractive spectral signal, and the suppression amount can reach 9.5570 dB-13.2407dB, and the spectral resolution of AOTF can be increased by 40.4-83.2db, which indicates that the dual-crystal quadratic filtering technique based on AOTF is proposed. High spectral resolution of AOTF and suppression of diffractive sidelobe have outstanding advantages.
【学位授予单位】：福建师范大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN713

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