Abstract
The spectral resolution is a main index of evaluating the performance of the designed acousto-optic tunable filter (AOTF). In this letter, an accurate expression of the spectral resolution is presented by considering both the birefringence and the rotatory property of TeO2 crystal. The deduced expression is significant in improving the accuracy of the design of an AOTF and pushing the development of the high-performance AOTF.
Highlights
acousto-optic tunable filter (AOTF) has been used in a wide range of applications, such as laser wavelength tuning, spectral analysis, spectral imaging [1,2,3], and etc
The spectral resolution is a main index of evaluating the performance of the designed acousto-optic tunable filter (AOTF)
During the A-O interaction, the filtered optical wavelength of AOTF is changed with the frequency of the acoustic wave, and the diffracted light has a narrow spectral band centered on a chosen wavelength
Summary
AOTF has been used in a wide range of applications, such as laser wavelength tuning, spectral analysis, spectral imaging [1,2,3], and etc. Light diffraction by acoustic wave propagating in the A-O crystal is the foundation of the operation of an AOTF. During the A-O interaction, the filtered optical wavelength of AOTF is changed with the frequency of the acoustic wave, and the diffracted light has a narrow spectral band centered on a chosen wavelength. Previous studies had confirmed that considering the birefringence of the interaction material and its rotatory property was an effective method of increasing the accuracy of the design obviously [4,5]. The spectral resolution is a key index of evaluating the performance of an AOTF for the actual applications. The previous expression of the spectral resolution which had been widely used is inaccurate for the neglect of the rotatory property [4,5,6,7].
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