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Proceedings Paper

Optical frequency references for laser interferometry
Author(s): Jan Hrabina; Martin Šarbort; Ouali Acef; Frédéric du Burck; Nicola Chiodo; Ondřej Číp; Josef Lazar
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Paper Abstract

Optical frequency references for laser standards based on molecular iodine absorption cells represent one of the most used tool for frequency stabilization of lasers operating in a visible spectral range. In the industry oriented laser measurements and similar laser interferometry applications performed at atmospheric conditions, a refractive index of air plays a role of main uncertainty contributor. In these cases there is no need to use technologically complicated and expensive iodine references made of pure fused silica with precise pressure control of absorpbing media. A set of iodine cells made of borosilicate glass was filled with certain amount of absorbing media to define the saturation point of iodine inside. A combination of these two approaches (pyrex material and controlled saturation pressure of iodine) allows us to simplify the laser stabilization setup (there is no need of additional iodine pressure level control) and reduce the overall reference’s costs with ensuring of sufficient frequency stability of the system at the same time. Spectral properties of manufactured cells were tested by hyperfine transitions linewidth measurement and comparison with results from traditional fused silica cells was done to investigate the long-term iodine purity inside the references. As the transitions linewidth method shows a very high sensitivity to iodine purity level, this method is proposed to be an alternative approach in investigation of contamination in iodine absorption cells where traditionally used techniques - laser induced fluorescence (LIF) and absolute frequency shifts measurement - can not be used.

Paper Details

Date Published: 7 January 2015
PDF: 6 pages
Proc. SPIE 9442, Optics and Measurement Conference 2014, 94420F (7 January 2015); doi: 10.1117/12.2086262
Show Author Affiliations
Jan Hrabina, Institute of Scientific Instruments of the AS CR, v.v.i. (Czech Republic)
Martin Šarbort, Institute of Scientific Instruments of the AS CR, v.v.i. (Czech Republic)
Ouali Acef, Sytèmes de Référence Temps Espace, CNRS, Observatoire de Paris (France)
Frédéric du Burck, Lab. de Physique des Lasers, CNRS, Univ. Paris 13 (France)
Nicola Chiodo, Lab. de Physique des Lasers, CNRS, Univ. Paris 13 (France)
Ondřej Číp, Institute of Scientific Instruments of the AS CR, v.v.i. (Czech Republic)
Josef Lazar, Institute of Scientific Instruments of the AS CR, v.v.i. (Czech Republic)


Published in SPIE Proceedings Vol. 9442:
Optics and Measurement Conference 2014
Jana Kovačičinová; Tomáš Vít, Editor(s)

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