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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