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Near-infrared optical frequency comb Vernier spectroscopy in air and in a flame
Umeå University, Faculty of Science and Technology, Department of Physics. (Optical Frequency Comb Spectroscopy Group)
2017 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

A Vernier spectrometer is built with a near-infrared mode-locked Er:doped fiber laser, a Fabry-Perot cavity with finesse of 1000, a diffraction grating and a photo detector. The optical cavity provides high sensitivity in absorption detection by enhancing the interaction length of the light with molecular species contained in the cavity. Coupling an optical frequency comb to the cavity provided a broadband spectral bandwidth with high precision to measure the absorption of several molecular species simultaneously. Also, by using the optical cavity as a filter, transmission of some bunch comb lines was achieved. This comb filtering together with a simple grating and a photodiode formed the Vernier detection technique to provide very fast measurements while it kept the setup very simple and compact. The system allows to detect carbon dioxide in the air and water vapor and OH radicals in the flame in a spectrum spanning from 1550 nm to 1590 nm, approximately. The retrieved spectrum has a resolution of 9.3 GHz being acquired in 0.05 s.

Place, publisher, year, edition, pages
2017. , 36 p.
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:umu:diva-132520OAI: oai:DiVA.org:umu-132520DiVA: diva2:1082163
Subject / course
Fysik D - examensarbete
Educational program
Master's Programme in Physics
Presentation
2017-01-30, Physics building, Bothnia, Umeå, 15:15 (English)
Supervisors
Examiners
Available from: 2017-03-16 Created: 2017-03-15 Last updated: 2017-03-16Bibliographically approved

Open Access in DiVA

Master thesis(14996 kB)37 downloads
File information
File name FULLTEXT01.pdfFile size 14996 kBChecksum SHA-512
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Type fulltextMimetype application/pdf

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Department of Physics
Atom and Molecular Physics and Optics

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CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf