Abstract

We report the frequency stabilization of a cw extended-cavity diode laser against saturated absorption lines of the H217O isotopologue of water vapor at around 1.384 μm. The saturation of rotovibrational transitions is achieved by filling a high-finesse optical resonator with H217O at low pressure and by locking the laser frequency to the resonator by using the Pound-Drever-Hall technique. Absolute frequency stabilization is obtained, locking the cavity resonance to the center of the sub-Doppler line by means of the wavelength modulation method. A relative frequency stability of σy(τ)=10−13(0.1τ−2+0.9)1/2 is demonstrated for integration times in the range 4 ms<τ<30 s.

© 2009 Optical Society of America

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