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 Title: LIQUID PHASE SUPERCONTINUUM FIBER-LOOP CAVITY ENHANCED ABSORPTION SPECTROSCOPY FOR H2O IN ORGANICS Author(s): Li, Mingyun Contributor(s): Lehmann, Kevin Subject(s): Instrument/Technique Demonstration Abstract: Last year we presented a way of liquid phase sensing for H$_{2}$O and D$_{2}$O samples using a side-polished-fiber (SPF) sensor. It is a setup to combine the advantages of Supercontinuum light source with fiber-loop sensing method to make liquid phase CEAS sensing easier and more reliable. After some calculation we found out that with a SPF sensor we could only make use of less than 0.2% of the light from Supercontinuum source, so we decided to make changes on sensors in order to make more light usable. Instead of a SPF or similar evanescent wave sensors, if the light can be guided through a sample directly in free space, we can get almost 100% of the light to be used. So we replaced our sensor by using a mirror and two fibers placed vertical to it side-by-side. The mirror reflects light from one fiber to the other. The free space coupling can make the most of our Supercontinuum source, and a much stronger signal is observed so far. We are now able to use our setup to monitor very low H$_{2}$O concentrations such as saturated H$_{2}$O solution in organics like CCl$_{4}$. Hopefully we can make our system more reliable in the future to make it use in more samples and lower concentrations. Issue Date: 6/22/2017 Publisher: International Symposium on Molecular Spectroscopy Citation Info: APS Genre: CONFERENCE PAPER/PRESENTATION Type: Text Language: English URI: http://hdl.handle.net/2142/97080 DOI: 10.15278/isms.2017.RI09 Date Available in IDEALS: 2017-07-27
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