Spontaneous Raman scattering at trace gas concentrations with a pressurized external multipass cavity

Autor:	Andreas Muller, Juan Gomez Velez
Rok vydání:	2021
Předmět:	symbols.namesake Materials science External cavity diode laser Applied Mathematics symbols Physics::Optics Atomic physics Instrumentation Engineering (miscellaneous) Raman scattering Trace gas
Zdroj:	Measurement Science and Technology. 32:045501
ISSN:	1361-6501 0957-0233
DOI:	10.1088/1361-6501/abd11e
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::ae93903f4b38d0be257688ecdc3b8eca https://doi.org/10.1088/1361-6501/abd11e Zobrazit plný text záznamu