Optically stabilized tunable diode-laser system for saturation spectroscopy |
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| Authors: | M Mürtz M Schaefer T George J S Wells W Urban |
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| Institution: | (1) Institut für Angewandte Physik der Universität Bonn, Wegelerstrasse 8, D-53115 Bonn, Germany;(2) Laboratoire de Physique des Lasers, Université Paris-Nord, Avénue J.-B. Clément, F-93430 Villetaneuse, France;(3) Time and Frequency Division, National Institute of Standards and Technology (NIST), 325 Broadway, 80303 Boulder, CO, USA |
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| Abstract: | We present an optically stabilized lead-salt diode-laser system which is the nucleus of a very-high-resolution instrument for sub-Doppler molecular spectroscopy in the mid-infrared. By application of external optical feedback, we have narrowed the diode-laser linewidth by two orders of magnitude, yielding a spectral width of less than 200 kHz. The diode- laser frequency is stabilized and controlled via the external reflector by variable-frequency offset-locking the diode-laser to a CO laser frequency. This substantial improvement in the spectral properties enabled us to perform a Lamb-dip experiment on a carbonyl sulfide (OCS) absorption line near 1985 cm–1. We were able to detect a saturated dispersion signal at low pressure (5 Pa) with a signal-to-noise ratio of several thousand. The present paper describes the unique features of the optically stabilized tunable diode-laser system and its use as a spectroscopic tool for sub-Doppler applications. |
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| Keywords: | 42 55 Px 42 62 Fi 07 65 Gj |
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