TY - JOUR
AU - Xiong, Youhui
AB - Recent studies on signal enhancement of spontaneous Raman scattering for developing of sensitive Raman gas detectorsare reported. Raman scattering is a gas detecting method with high feasibility, but usually its signal is very low. Toimprove the level and the quality of the Raman signal, the effects of pumping laser source, sample cell, and opticalarrangement are studied in detail. It is found that not only the wall of sample cell will give a wide Raman or fluorescencebackground which will decrease the sensitivity, but the dichroic beam splitter will also contribute considerablebackground if it is not aligned properly. The sample cell of hollow fiber is characterized by its high responsibility as wellas its high background and low signal contrast. When the hollow fiber is replaced by a free-space sample cell consistedof metal-coated parabolic reflector, the wide background is largely suppressed. If there is no common optical elementsbetween the pumping and collecting optical systems, the wide background will be cut down obviously, which is provedby the intracavity-enhanced Raman scattering in a He-Ne laser. These experimental results will be helpful for theresearch and developing of highly sensitive Raman gas detectors.
TI - Studies on sensitive Raman gas detectors
JF - Proceedings of SPIE
DO - 10.1117/12.2016345
DA - 2013-05-31
UR - https://www.deepdyve.com/lp/spie/studies-on-sensitive-raman-gas-detectors-5Qvss3NwUO
SP - 87180N
EP - 87180N-8
VL - 8718
IS - 
DP - DeepDyve
ER -