Development and investigation of frequency references for the 1.55-um optical communication band

Yordanka V. Dancheva; Rina Sharma; Uwe Sterr; Fritz Riehle

doi:10.1117/12.347620

7 May 1999 Development and investigation of frequency references for the 1.55-μm optical communication band

Yordanka V. Dancheva, Rina Sharma, Uwe Sterr, Fritz Riehle

Proceedings Volume 3571, Tenth International School on Quantum Electronics: Laser Physics and Applications; (1999) https://doi.org/10.1117/12.347620
Event: 10th International School on Quantum Electronics: Lasers: Physics and Applications, 1998, Varna, Bulgaria

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%.

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Yordanka V. Dancheva, Rina Sharma, Uwe Sterr, and Fritz Riehle "Development and investigation of frequency references for the 1.55-μm optical communication band", Proc. SPIE 3571, Tenth International School on Quantum Electronics: Laser Physics and Applications, (7 May 1999); https://doi.org/10.1117/12.347620

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KEYWORDS

Absorption

Spectroscopy

Semiconductor lasers

Signal to noise ratio

Diffraction gratings

Protactinium

Optical communications

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