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Proceedings Paper

Sidelobe reduction of acousto-optic tunable filter by double-filtering
Author(s): Chunguang Zhang; Hao Wang; Yishen Qiu
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Paper Abstract

For the high acoustic figure of merit of paratellurite (TeO2), it is the most widely used material for acousto-optic tunable filters (AOTFs). The noncollinear AOTF has many applications such as spectral analysis and spectral imaging. We have designed two noncollinear AOTFs which work in VIS range of 550 nm-680 nm. In these two AOTFs, the angle between the propagating direction of the acoustic shear wave and [110] axis is designed to be equal. The two AOTFs are placed fore-and-aft. As the two AOTFs are operated at the same time, a so-called "double-filtering" function takes place. By analysis, it can be identified that the double-filtering method can be helpful to improve the performance of the AOTF. In this letter, we have study the function of double-filtering on the sidelobe reduction. By computation, we have given the results which can describe that the sidelobe has been decreased obviously in our studied optical wavelength range. Our study indicates that double-filtering method can be used as a functional method for sidelobe reduction; it is significant for the performance improving of modern AOTF.

Paper Details

Date Published: 12 October 2010
PDF: 6 pages
Proc. SPIE 7656, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 76566F (12 October 2010); doi: 10.1117/12.866285
Show Author Affiliations
Chunguang Zhang, Fujian Normal Univ. (China)
Hao Wang, Fujian Normal Univ. (China)
Yishen Qiu, Fujian Normal Univ. (China)


Published in SPIE Proceedings Vol. 7656:
5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment
Yudong Zhang; Jose M. Sasian; Libin Xiang; Sandy To, Editor(s)

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