期刊
MEASUREMENT SCIENCE AND TECHNOLOGY
卷 32, 期 4, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1361-6501/abd11e
关键词
Raman scattering; multipass cavity; external cavity diode laser; chemical gas sensing
The setup utilizes a high power multimode semiconductor laser diode and an optical cavity to greatly enhance the spontaneous Raman scattering rate from pressurized gas samples, achieving a detection limit below 100 parts-per-billion for gaseous hydrogen. Isotopic trace detection is also demonstrated through headspace measurements of semiheavy water.
A setup is described with which the spontaneous Raman scattering rate from pressurized gas samples is greatly enhanced inside a near-concentric optical cavity. The pump source is a high power multimode semiconductor laser diode that receives optical feedback from the cavity by way of a volume Bragg grating, resulting in a linewidth of 80 pm and circulating power close to 100 W. Under pressurization (up to 8 bar) a limit of detection below 100 parts-per-billion was obtained for gaseous hydrogen, measured in ambient air and in breath. Furthermore, isotopic trace detection is demonstrated by headspace measurements of semiheavy water.
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