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dc.contributor.authorTrefiak, Nicholas Ronald
dc.contributor.otherQueen's University (Kingston, Ont.). Theses (Queen's University (Kingston, Ont.))en
dc.date2007-07-04 16:23:53.173en
dc.date.accessioned2007-07-05T16:46:28Z
dc.date.available2007-07-05T16:46:28Z
dc.date.issued2007-07-05T16:46:28Z
dc.identifier.urihttp://hdl.handle.net/1974/436
dc.descriptionThesis (Master, Chemistry) -- Queen's University, 2007-07-04 16:23:53.173en
dc.description.abstractRingdown spectroscopy (RDS) is an absorption spectroscopic and detection technique that makes use of an optical cavity to realize a long effective pathlength through a sample and to render the measurement independent of intensity. These two features give RDS an advantage over traditional absorption techniques and allows its application in measuring concentrations of strongly absorbing analytes present in trace amounts, or in measuring weak absorptions for analytes in higher concentrations. The resonant optical cavities used here are created from optical fibre. This permits the easy construction of an inexpensive apparatus for RDS. The performance of various cavity geometries (linear, circular) in three ranges of the visible and near infrared spectrum (405, 800, and 1550 nm) was examined. Concurrent multiexponential decays arising from core modes, cladding modes, and amplified spontaneous emission were analyzed in the framework of an exponential decay model transformed into the frequency domain. The small mode field diameter of light within a fibre is well suited to probing very small liquid volumes on the order of pico- or femtolitres. This uniquely positions optical waveguide-based RDS for application in absorption detection for separation techniques such as capillary electrophoresis (CE) and high performance liquid chromatography (HPLC) where high time resolution detection is required across narrow separation channels. The experimental and theoretical work presented here was preformed with an eye towards this purpose.en
dc.format.extent5154273 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoenen
dc.relation.ispartofseriesCanadian Thesesen
dc.rightsThis publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owner.en
dc.subjectabsorption spectroscopyen
dc.subjectoptical waveguidesen
dc.titleRingdown spectroscopy in optical waveguidesen
dc.typeThesisen
dc.description.degreeMasteren
dc.contributor.supervisorLoock, Hans-Peteren
dc.contributor.departmentChemistryen


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