Berlin 2001 – scientific programme
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Q: Quantenoptik
Q 21: Poster: Optical Applications
Q 21.7: Poster
Thursday, April 5, 2001, 12:30–15:00, AT2
A compact, portable Lambdameter with digital fringe interpolation — •K. Franz, A. Gopalan, J. Bömmels, M.-W. Ruf, and H. Hotop — Department of Physics, University of Kaiserslautern, D-67663 Kaiserslautern, Germany
For a reliable and accurate measurement of the (center) wavelength of narrowband cw lasers we have developed a compact and portable lambdameter, involving a scanning Michelson interferometer [1] and a polarization-stabilized He-Ne laser as wavelength reference. A digital fringe interpolation technique [2,3] is used to improve the accuracy by a factor of about one hundred over that due to integral fringe counting. For a stabilized single mode laser the wavelength can be measured with accuracies better than 10−7. The center wavelength of a multi-mode dye-laser (0.4 cm−1 linewidth), used for selective excitation of Rydberg states in a collimated potassium beam, has been determined with an accuracy of about 0.04 cm−1 at a data acquisition rate of 1 Hz. This work has been supported by the Deutsche Forschungsgemeinschaft and by the Zentrum für Lasermesstechnik und Diagnostik at Universität Kaisers-lautern.
[1] J. L. Hall and S. A. Lee, Appl. Phys. Lett. 29 (1976) 367
[2] S. J. Bennett, P. Gill, J. Phys. E 13 (1980) 174
[3] J. Bömmels et al., J. Phys. B 32 (1999) 2399