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Proceedings Paper

Resolution improvement of grating spectrometer by using a tunable Fabry-Perot filter
Author(s): Liang Fang; Zhendong Shi; Chuankai Qiu; Chongxi Zhou
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Paper Abstract

Aiming at the problem of the resolution reduction in a miniaturized grating spectrometer, we presented a method to improve its spectral resolution by inserting a tunable Fabry-Perot filter into its optical path before the grating. The Fabry-Perot filter was designed to filter out a partial spectrogram and separate the original undistinguishable spectral lines so as to make their actual wavelengths can be detected. The different cavity length of the Fabry-Perot filter is corresponding to the different separated partial spectrogram. Combining all the separated partial spectrograms, an entire spectrogram with improved resolution can be achieved. Experimentally, the spectral resolution of a grating dispersive system was improved from 2 nm to 1.2nm in a broad spectral range by insetting a homemade tunable Fabry-Perot filter, which demonstrated the feasibility of this scheme. The tunable Fabry-Perot filter is fit for miniaturization by using MEMS technology and is able to work as an independent module. The method proposed provides a potential way to improve the spectral resolution without reducing the spectral range of the existing miniaturized grating spectrometers.

Paper Details

Date Published: 8 October 2015
PDF: 7 pages
Proc. SPIE 9677, AOPC 2015: Optical Test, Measurement, and Equipment, 96772D (8 October 2015); doi: 10.1117/12.2202801
Show Author Affiliations
Liang Fang, Institute of Optics and Electronics (China)
Zhendong Shi, Institute of Optics and Electronics (China)
Chuankai Qiu, Institute of Optics and Electronics (China)
Chongxi Zhou, Institute of Optics and Electronics (China)

Published in SPIE Proceedings Vol. 9677:
AOPC 2015: Optical Test, Measurement, and Equipment
Sen Han; Jonathan D. Ellis; Junpeng Guo; Yongcai Guo, Editor(s)

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