Modulation-Free Frequency Stabilization of a Grating-External-Cavity Diode Laser by Magnetically Induced sub-Doppler Dichroism in Cesium Vapor Cell

概要

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Thanks to the Zeeman effect and the saturation absorption spectroscopic technique, magnetically induced sub-Doppler dichroism has been experimentally demonstrated in a cesium vapor cell. A dispersion-like frequency-discriminating signal is obtained by this sub-Doppler dichroism. The phase-sensitive detection via lock-in is no longer required because there is no frequency dither on the laser. A grating-external-cavity 852 nm diode laser is frequency-stabilized to cesium 6 2S1/2 F = 4–6 2P3/2 F$'$ = 4, 5 crossover by this modulation-free locking scheme. Compared with a frequency fluctuation of approximately 12 MHz under free-running conditions, a typical frequency jitter of less than $+/-$ 260 kHz in 50 s was estimated in the preliminary stabilization. This locking scheme is relatively simple, and it can avoid extra noise due to the direct frequency dither on the laser source in the conventional saturation absorption locking technique.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2004-03-15