Hamburg 2009 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 29: Poster I

Q 29.22: Poster

Dienstag, 3. März 2009, 16:30–19:00, VMP 8 Foyer

Highly-accurate laser wavelength meter using an atomic transition as a reference — •Anastasiya Khromova, Andrés Felipe Varón, Benedikt Scharfenberger, Christian Piltz, and Christof Wunderlich — Fachbereich Physik, Universität Siegen, Walter-Flex-Straße 3, 57068 Siegen

In order to perform accurate spectroscopic measurements or to drive atomic transitions one requires to know precisely the wavelength of the lasers. In our lab we have built a Michelson based wavelength meter [1], which uses an atomic Rb transition as a reference [2].

With our wavelength meter we are able to measure the wavelengths in the range of 350 nm - 1µm - the range of the optical components. Using Labview we are able to choose between four different wavelengths that are simultaneously coupled into the wavelength meter.

The reference laser is a frequency-stabilized diode laser at 780 nm. It is locked to the cross-over signal (linewidth 6MHz) of the 5²S_1/2,F=2↔ 5²P_3/2,F=2 and F=3 transition in the ⁸⁷Rb. The relative error on the unknown wavelength equals 10⁻⁸. Counter and electronics set the limits on the precision. The details of the set up and physical principles of the used techniques will be highlighted.

[1] J. L. Hall and S. A. Lee, Appl. Phys. Lett. 29, 367 (1976).

[2] A. Banerjee et al., Appl. Phys. Lett. 79, 2139 (2001).