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Proceedings Paper

Etalon of optical frequency for the telecommunication spectral region
Author(s): Josef Lazar; Bohdan Ruzicka; Ondrej Cip
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Paper Abstract

We present a design of a stabilized laser system, an etalon of the optical frequency at the 1.5 μm band following the demands of the telecommunication industry in the Czech Republic. Our laser system employs a DFB laser diode in a two stage fully digital stabilizing scheme. The linear absorption arrangement with an acetylene filled absorption cell of a pressure about 1 kPa is used to lock the laser to the Doppler-broadened lines. To achieve a reliable and robust stabilization of the laser frequency we arranged a two-loop digital servo-system overcoming the problem of a narrow locking range of the detected transition. The wavelength of the laser is modulated by current and the servo-control and tuning is performed by a fast and precise thermal control. To achieve the resolution of the weak sub-Doppler transitions we assembled a locking scheme via frequency-modulation spectroscopy to the high finesse cavity. The system is assembled using predominantly fibre-optic components. A technology of acetylene absorption cells with AR coated windows is presented as well.

Paper Details

Date Published: 10 September 2004
PDF: 5 pages
Proc. SPIE 5457, Optical Metrology in Production Engineering, (10 September 2004); doi: 10.1117/12.545714
Show Author Affiliations
Josef Lazar, Institute of Scientific Instruments (Czech Republic)
Bohdan Ruzicka, Institute of Scientific Instruments (Czech Republic)
Ondrej Cip, Institute of Scientific Instruments (Czech Republic)

Published in SPIE Proceedings Vol. 5457:
Optical Metrology in Production Engineering
Wolfgang Osten; Mitsuo Takeda, Editor(s)

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