Optical frequency stabilization in infrared region using improved dual feed-back loop

B. Ružička; O. Číp; J. Lazar

doi:10.1117/12.729500

25 April 2007 Optical frequency stabilization in infrared region using improved dual feed-back loop

B. Ružička, O. Číp, J. Lazar

Proceedings Volume 6606, Advanced Laser Technologies 2006; 660604 (2007) https://doi.org/10.1117/12.729500
Event: Advanced Laser Technologies 2006, 2006, Brasov, Romania

Abstract

Modern technologies such as DWDM (Dense Wavelength Division Multiplex) need precise stability of laser frequencies. According to this fact, requirements of new etalons of optical frequencies in the telecommunication band is rapidly growing. Lasers working in near infrared telecommunication band (1500-1600 nm) can be stabilized to ¹²C₂H₂ or ¹³C₂H₂ (acetylene) gas absorption lines. The acetylene gas absorption has been widely studied and accepted by international bodies of standardization as a primary wavelength reference in the near infrared band around 1550 nm. Our aim was to design and develop a compact fibre optics laser system generating coherent light in near-IR band with high frequency stability (at least 1.10^-8). This system should become a base for realization of a primary frequency standard for optical communications in the Czech Republic. Such an etalon will be needed for calibration of wavelengthmeters and spectral analysers for DWDM communication systems. We are co-operating with CMI (Czech Metrology Institute) on this project. We present stabilized laser system based on a single frequency DFB (Distributed Feedback) laser diode with a narrow spectral profile. The laser is pre-stabilized by means of the FM-spectroscopy on a passive resonator. Thanks to a fast feed-back loop we are able to improve spectral characteristics of the laser. The laser frequency is locked by a relatively slow second feed-back loop on an absorption line of acetylene vapour which is sealed in a cell under the optimised pressure.

Citation Download Citation

B. Ružička, O. Číp, and J. Lazar "Optical frequency stabilization in infrared region using improved dual feed-back loop", Proc. SPIE 6606, Advanced Laser Technologies 2006, 660604 (25 April 2007); https://doi.org/10.1117/12.729500

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