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Optics Communications

Modulation-free laser frequency stabilization to a saturated sub-Doppler spectral line in a transversal magnetic field

Sho Okubo, Kana Iwakuni, Taro Hasegawa

Published Jun 22, 2012• 11 citations
Publisher
DOI
10.1016/j.optcom.2012.06.007

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The frequency of a GaAs semiconductor laser was locked to the hyperfine spectrum of the Rb D/sub 1/ line by saturation spectroscopy. A first GaAs laser was locked to one of the Doppler-free hyperfine lines using a source modulation method. The burnt hole modulated by the stabilized laser beam was detected by a second laser beam irradicated from the same or the opposite direction and was used as a frequency discriminator to stabilize the second laser. The characteristics of the double-resonance spectrum were measured. The frequency stability of the second laser, which was free from frequency modulation, was estimated to be on the order of 10/sup -9/.>
We report the frequency stabilization of a diode laser by applying the dichroic-atomic-vapor laser lock (DAVLL) method to a thin Rb vapor cell. A 1-mm-long Rb vapor cell is used to obtain a sub-Doppler spectrum that is required for frequency locking, which is easier than in the case of using a saturated absorption spectrometer. A 794-nm diode laser is tuned to the Rb D 1 line, and sub-Doppler signals are observed by introducing a pumping beam and a probe beam in a perpendicular direction. We obtain error signals by subtracting the signals of σ+ polarized beams from that of σ- polarized beams in the presence of a magnetic field and stabilized the 794 nm diode laser frequency without modulating laser parameters. The stability of the 794-nm diode laser is evaluated using other independently stabilized diode laser.
A sub-MHz frequency stability of the laser is crucial in the quantum-atom experiment where precise atomic transition is required for control and manipulation of atom like in the atom quantum computing. In this work, we have built the frequency stabilization system for the lasers used in our cold Rubidium atom experiment in the magneto-optical trap (MOT) and the optical tweezers. We utilized a Rubidium vapour glass cell as a frequency reference, which provides atomically absolute reference point with low complexity setup. By mean of the absorption of the laser beam by the Rubidium vapour, the Doppler-free saturated absorption (DFSA) experiment was setup to produce the D2 line spectra. The acousto-optic modulator (AOM) was used to sinusoidally dither the laser frequency and consequently the resonance peaks in the spectra. Detailing in this work, the AOM sinusoidal dithering and the dithered DFSA signal had orthogonality and were processed together to produce the error signal used to stabilize the laser frequency to the resonant peak. This frequency stabilization system achieved the frequency standard deviation below 0.75 MHz over 200 minutes period. The system also allowed for stabilized frequency tunability over a range of 55-60 MHz about the target resonance peak. This performance is significant for stabilizing the lasers in the MOT experiment and related quantum-atom research.