High power DFB lasers for D1 and D2 caesium absorption spectroscopy and atomic clocks
A. Klehr, H. Wenzel, O. Brox, F. Bugge, G. Erbert, T-P. Nguyen and G. Tränkle
Published in:
Proc. SPIE, vol. 6909, no. 69091E (2008).
Abstract:
Distributed feedback ridge-waveguide lasers, emitting up to 250 mW in a single lateral and longitudinal mode at 852 nm and 894 nm are presented. A threshold current of 40 mA and a differential quantum efficiency of 1 W/A is achieved. The distributed feedback is provided by a second order grating, formed into an InGaP/GaAs/InGaP multilayer structure. Owing to the stable lasing frequency, the large side mode suppression ratio (>40 dB) and the small spectral line width (<500 kHz) the lasers are well suited for atomic clocks and Caesium D1 and D2 spectroscopy. This was verified by the measurement of the hyperfine structure of the Caesium lines.
Ferdinand-Braun-Institut für Höchstfrequenztechnik, Gustav-Kirchhoff-Straße 4, D-12489 Berlin, Germany
Keywords:
Semiconductor lasers, distributed-feedback lasers, high-power lasers, atomic clocks, absorption spectroscopy
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