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Proceedings Paper

Development and investigation of frequency references for the 1.55-μm optical communication band
Author(s): Yordanka V. Dancheva; Rina Sharma; Uwe Sterr; Fritz Riehle
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Paper Abstract

For intra-cavity high resolution spectroscopy of acetylene (C2H2), an extended cavity diode laser (ECDL) system emitting at 1.55 micrometers has been built using a 600 lines/mm diffraction grating mounted in Littrow configuration. In a single pass absorption cell the linear absorption of a number of rovibrational overtone transitions of C2H2 has been registered. An external FP cavity (finesse of 300, free spectral range FSR equals 520 MHz) was built and utilized for C2H2 intra-cavity spectroscopy as well as for ECDL frequency stabilization. The Pound-Drever-Hall technique was used to lock the diode laser frequency to the external cavity with the servo bandwidth of 50 kHz. The C2H2 intra-cavity linear absorption was recorded in transmission at a pressure of 1.3 Pa. By combining the reflected and transmitted signals the influence of residual frequency fluctuation of the ECDL with respect to the external cavity was reduced and the signal to noise ratio was improved to 34 dB for a single pass linear absorption of 0.2%.

Paper Details

Date Published: 7 May 1999
PDF: 5 pages
Proc. SPIE 3571, Tenth International School on Quantum Electronics: Laser Physics and Applications, (7 May 1999); doi: 10.1117/12.347620
Show Author Affiliations
Yordanka V. Dancheva, Institute of Electronics (Bulgaria)
Rina Sharma, National Physical Lab. (India)
Uwe Sterr, Physikalisch-Technische Bundesanstalt (Germany)
Fritz Riehle, Physikalisch-Technische Bundesanstalt (Germany)


Published in SPIE Proceedings Vol. 3571:
Tenth International School on Quantum Electronics: Laser Physics and Applications
Peter A. Atanasov; Dimitar V. Stoyanov, Editor(s)

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