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CO2 laser stabilization to 0.1-Hz level using external electrooptic modulation

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8 Author(s)
Bernard, V. ; Lab. de Phys. des Lasers, Univ. de Paris-Nord, Villetaneuse, France ; Daussy, C. ; Nogues, G. ; Constantin, L.
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We have developed a frequency stabilization scheme for CO2 lasers using only external modulation via an electrooptic modulator (EOM). One of the two laser sidebands which are generated by the EOM and frequency-modulated is set in resonance with a Fabry-Perot cavity, itself filled with OsO4 as an absorber. The saturation signal of an OsO4 line detected in transmission of the Fabry-Perot cavity is used for stabilization. We obtained a stability of 0.1 Hz (Δν/ν=3.5 10-15) on a 100-s time scale, and a reproducibility up to 10 Hz with the strongest OsO4 reference lines. These results largely improve the performance of our previous setup for which modulation was applied through piezoelectric transducers. Further, the stabilized laser is not frequency-modulated and is easily tunable

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Quantum Electronics, IEEE Journal of  (Volume:33 ,  Issue: 8 )