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Journal of Time and Frequency

A DFB laser-pumped rubidium atomic frequency standard

DONG TAI-QIAN

Published Jan 1, 2012• 0 citations
OpenAlex

Abstract

We use one DFB laser diode(780 nm) as the pumping source,which is based on a homemade traditional rubidium frequency standard with the discharge lamp assembly removed.The laser frequency is locked to the 87Rb cycling transition(52S1/2,F=2→52P3/2,F=3) by means of traditional saturation absorption locking technique and the microwave rubidium frequency standard locking loop is accomplished.The initial short-term stability of the rubidium clock is measured to be 3.7×10-12 τ-1/2(1~100 s).

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We use one DFB laser diode(780 nm) as the pumping source,which is based on a homemade traditional rubidium frequency standard with the discharge lamp assembly removed.The laser frequency is locked to the 87Rb cycling transition(52S1/2,F=2→52P3/2,F=3) by means of traditional saturation absorption locking technique and the microwave rubidium frequency standard locking loop is accomplished.The initial short-term stability of the rubidium clock is measured to be 3.7×10-12 τ-1/2(1~100 s).
We present our recently experimental results on a DFB laser diode pumped Rubidium atomic frequency standard. Our experiment was based on a homemade lamp-pumped Rubidium frequency standard with the discharge lamp assembly removed. In the experiment, we first locked a DFB laser diode to the87Rb cycling transition (5S1/2, F=2→5P3/2, F=3) by means of saturation absorption locking technique. After that, we optimized the parameters carefully related to the clock performance, such as temperature of the physical package, amplitude of the modulation signal for the laser locking. The preliminary short-term stability of our clock is measured 5.25×10−12τ−1/2(1s<τ<100s).
We present the development and complete spectral characterization of our compact and frequency-stabilized laser heads, to be used for rubidium atomic clocks and basic spectroscopy. The light source is a Distributed Feed-Back (DFB) laser diode emitting at 780 nm or 795 nm. The laser frequency is stabilized on a sub-Doppler absorption peak of the 87Rb atom, obtained from an evacuated rubidium cell. These laser heads, including the electronics for the light signals detection, have an overall volume of 0.63 liters. We also present a variant of the laser head into which is integrated an Acousto-Optical Modulator (AOM) that precisely detunes the laser frequency in order to minimize the AC Stark shift in Rb atomic clocks.
The paper presents the realisation of a high-performance vapour-cell atomic frequency standard demonstrator based on laser optical pumping. The development of such devices aims to fully exploit the advantages of using a narrow-band diode laser pump light source instead of the discharge lamps commonly used in Rb gas-cell clocks. These advantages include improved control over the pump light spectrum, higher selectivity of the optical pumping, and increased signal contrast, and thus show the potential for the realisation of Rb atomic clocks with improved short-term frequency stability.
This paper studies a miniature low power consumption laser-pumped atom vapour cell clock scheme. Pumping 87 Rb with a vertical cavity surface emitting laser diode pump and locking the laser frequency on a Doppler-broadened spectral line, it records a 5 × 10 −11 τ −1/2 (τ < 500 s) frequency stability with a table-top system in a primary experiment. The study reveals that the evaluated scheme is at the level of 2.7 watts power consumption, 90 cm 3 volume and 10 −12 τ −1/2 short-term frequency stability.
We report the progress of our work on the observation and the characterization of 87Rb vapor resonances in order to frequency-lock a 1529 nm DFB semiconductor laser. We present energy levels diagrams corresponding to the 5P3/2 yields 4D5/2 and 4D3/2 transitions of rubidium atoms, respectively at 1529.4 and 1529.3 nm (196.02 and 196.04 THz). Basic emission characteristics of our DFB laser are also given. We then show the absorption profiles of a probe laser emitting around 1529 nm while the 87Rb vapor is optically pumped at 780.2 nm (D2 line at 384.2 THz) using a 30 mW AlGaAs laser. We finally present, for this experiment, the dependence of the probe laser absorption resonance depth and linewidth on the pump power.