Towards a portable Raman spectrometer using a concave grating and a time-gated CMOS SPAD

A low-cost, compact Raman spectrometer suitable for the on-line water monitoring applications is explored. A custom-designed concave grating for wavelength selection was fabricated and tested. The detection of the Raman signal is accomplished with a time-gated single photon avalanche diode (TG-SPAD)...

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Bibliographic Details
Published inOptics express Vol. 22; no. 15; pp. 18736 - 18747
Main Authors Li, Zhiyun, Deen, M Jamal
Format Journal Article
LanguageEnglish
Published United States 28.07.2014
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Summary:A low-cost, compact Raman spectrometer suitable for the on-line water monitoring applications is explored. A custom-designed concave grating for wavelength selection was fabricated and tested. The detection of the Raman signal is accomplished with a time-gated single photon avalanche diode (TG-SPAD). A fixed gate window of 3.5ns is designed and applied to the TG-SPAD. The temporal resolution of the SPAD was ~60ps when tested with a 7ps, 532nm solid-state laser. To test the efficiency of the gating in fluorescence signal suppression, different detection windows (3ns-0.25ns) within the 3.5ns gate window are used to measure the Raman spectra of Rhodamine B. Strong Raman peaks are resolved with this low-cost system.
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ISSN:1094-4087
1094-4087
DOI:10.1364/oe.22.018736