Resolution improvement of grating spectrometer by using a tunable Fabry-Perot filter

Liang Fang; Zhendong Shi; Chuankai Qiu; Chongxi Zhou

doi:10.1117/12.2202801

8 October 2015 Resolution improvement of grating spectrometer by using a tunable Fabry-Perot filter

Liang Fang, Zhendong Shi, Chuankai Qiu, Chongxi Zhou

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

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.

Citation Download Citation

Liang Fang, Zhendong Shi, Chuankai Qiu, and 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); https://doi.org/10.1117/12.2202801

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KEYWORDS

Fabry–Perot interferometers

Optical filters

Tunable filters

Spectroscopy

Spectral resolution

Electronic filtering

Lamps

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