External-cavity diode laser based spectrometer for absolute determination of iodine lines around 633 nm

M. Vainio, M. Merimaa, K. Nyholm, E. Ikonen

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review


We have developed and characterized a new iodine spectrometer for absolute frequency measurements of I2 transitions at the 633-nm region. This region is important especially in length metrology. To obtain good frequency accuracy, the various sources of frequency shifts in the used saturation spectroscopy configuration have been minimized by optimizing the laser beams for spatial and spectral quality. This is done by injection locking a microlens-coupled diode laser with nearly Gaussian output beam to a stable external-cavity diode laser. The use of the injection-locking scheme also reduces the detrimental effects of optical feedback, as well as residual amplitude modulation related to laser frequency modulation via injection current.

Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
PublisherInternational Society for Optics and Photonics SPIE
Number of pages9
Publication statusPublished - 15 Nov 2005
MoE publication typeNot Eligible
EventOpto-Ireland 2005: Optical Sensing and Spectroscopy - Dublin, Ireland
Duration: 4 Apr 20056 Apr 2005

Publication series

SeriesProceedings of SPIE


ConferenceOpto-Ireland 2005: Optical Sensing and Spectroscopy


  • External-cavity diode laser
  • Injection locking
  • Iodine
  • Optical frequency measurements
  • Spectroscopy

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