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Proceedings Paper

External-cavity diode laser based spectrometer for absolute determination of iodine lines around 633 nm
Author(s): M. Vainio; M. Merimaa; K. Nyholm; E. Ikonen
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Paper Abstract

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.

Paper Details

Date Published: 3 June 2005
PDF: 9 pages
Proc. SPIE 5826, Opto-Ireland 2005: Optical Sensing and Spectroscopy, (3 June 2005); doi: 10.1117/12.605104
Show Author Affiliations
M. Vainio, Helsinki Univ. of Technology (Finland)
M. Merimaa, Ctr. for Metrology and Accreditation (Finland)
K. Nyholm, Ctr. for Metrology and Accreditation (Finland)
E. Ikonen, Helsinki Univ. of Technology (Finland)
Ctr. for Metrology and Accreditation (Finland)


Published in SPIE Proceedings Vol. 5826:
Opto-Ireland 2005: Optical Sensing and Spectroscopy
Gerard D. O'Sullivan; Brian D. MacCraith; Hugh James Byrne; Enda McGlynn; Alan G. Ryder, Editor(s)

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