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Analysis of acousto-optic tunable filter performance for imaging applications

机译：用于成像应用的声光可调滤波器性能分析

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摘要

Acousto-optic tunable filters (AOTFs) can be used as spectral filters in multispectral imaging applications. Acousto-optic crystals diffract a single wavelength from a broadband light beam, depending on the applied radio frequency signal. However, experimental measurements show that the actual performance is far from the expected behavior. We present an experimental characterization of several commercial off-the-shelf AOTFs for the implementation of multispectral imaging instruments. The diffraction performance of three bare crystals is compared, while a fourth AOTF crystal is mounted on the optical path of a multispectral im-ager to evaluate its performance. The experiments show that the behavior of all the analyzed AOTFs differs from the theoretical expectations and presents uneven diffraction efficiency, a Gaussian dependency with the applied power, and a strong nonlinear relationship with the driving signal frequency. The different behavior of each AOTF in terms of all the analyzed parameters shows the necessity for an in-depth characterization of the AOTF performance once mounted on a multispectral imaging device if quantitative measurements are required. Finally, several recommendations for use are derived from these experimental results.
机译：声光可调滤光片（AOTF）可用作多光谱成像应用中的光谱滤光片。取决于所施加的射频信号，声光晶体从宽带光束中衍射出单个波长。但是，实验测量表明，实际性能与预期行为相差甚远。我们介绍了几种用于实现多光谱成像仪器的商用现货AOTF的实验表征。比较了三个裸晶的衍射性能，同时将第四个AOTF晶体安装在多光谱成像仪的光路上以评估其性能。实验表明，所有分析出的AOTF的行为均与理论预期不同，并且呈现出不均匀的衍射效率，与施加功率的高斯相关性以及与驱动信号频率的强非线性关系。就所有分析参数而言，每个AOTF的不同行为表明，如果需要定量测量，则一旦安装在多光谱成像设备上，就必须对AOTF性能进行深入表征。最后，从这些实验结果中得出了一些使用建议。

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