8 October 2015 Resolution improvement of grating spectrometer by using a tunable Fabry-Perot filter
Author Affiliations +
Proceedings Volume 9677, AOPC 2015: Optical Test, Measurement, and Equipment; 96772D (2015) https://doi.org/10.1117/12.2202801
Event: Applied Optics and Photonics China (AOPC2015), 2015, Beijing, China
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.
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Liang Fang, Liang Fang, Zhendong Shi, Zhendong Shi, Chuankai Qiu, Chuankai Qiu, Chongxi Zhou, Chongxi Zhou, } "Resolution improvement of grating spectrometer by using a tunable Fabry-Perot filter", Proc. SPIE 9677, AOPC 2015: Optical Test, Measurement, and Equipment, 96772D (8 October 2015); doi: 10.1117/12.2202801; https://doi.org/10.1117/12.2202801

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