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

被引：33
|
作者：
Li, Zhiyun [1 ]
Deen, M. Jamal [1 ]
机构：
[1] McMaster Univ, Sch Biomed Engn, Hamilton, ON L8S 4K1, Canada
来源：
OPTICS EXPRESS | 2014年 / 22卷 / 15期
关键词：
PHOTON AVALANCHE-DIODE; DYNAMIC-RANGE; SPECTROSCOPY; SYSTEM; DESIGN;
D O I：
10.1364/OE.22.018736
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
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 similar to 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. (C)2014 Optical Society of America
引用
收藏
页码：18736 / 18747
页数：12
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