26 April 1995 Frequency stabilization of CO2 lasers at the Hertz level
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Ultrahigh resolution spectroscopy and metrology require very stable lasers with a high spectral purity. For spectroscopy with a resolution up to 1 kHz at 30 THz, the laser stabilization on a strong molecular absorption line detected in an external cell can provide a stability of a few Hz/mn and a linewidth of about 10 Hz. The development of a new stabilization scheme which acts separately on the short- and long-term stabilities is in progress. The stabilization on a peak of a high-finesses ULE Fabry-Perot cavity by using a piezoelectric transducer and an acousto-optic modulator should yield a laser linewidth of better than 1 Hz. Frequency locking on a molecular saturation line detected in transmission of another Fabry-Perot cavity can provide a long-term stability of a few Hertz on several hours. Such performances are required for spectroscopy with a resolution better than 100 Hz and for the realization of a new generation of frequency standards in the 10-micrometers spectral region based on a signal of a two-photon Ramsey fringes experiment.
© (1995) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Thomas George, Thomas George, H. W. Nicolaisen, H. W. Nicolaisen, V. Bernard, V. Bernard, P. E. Durand, P. E. Durand, Anne Amy-Klein, Anne Amy-Klein, Christian Chardonnet, Christian Chardonnet, Christian Breant, Christian Breant, } "Frequency stabilization of CO2 lasers at the Hertz level", Proc. SPIE 2378, Laser Frequency Stabilization and Noise Reduction, (26 April 1995); doi: 10.1117/12.208230; https://doi.org/10.1117/12.208230

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