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Optics Continuum

Power stabilization method of a diode laser for compact vapor cell frequency standards

Jaeuk Baek, Soyeon Choi, Seji Kang, Sang Eon Park, Meung Ho Seo, Taeg Yong Kwon, Sang-Bum Lee, Jae Hoon Lee, Youngho Park, Sangwon Seo, Hyun-Gue Hong

Published Jan 22, 2026• 1 citation
Publisher

Abstract

We present a compact and power-efficient method for stabilizing the output power of a diode laser by leveraging its integrated temperature control. We demonstrate that this approach is highly effective in mitigating slow power drift. In particular, we verify that the power stabilization loop introduces negligible perturbation to the frequency stability and is even beneficial for an optimized gain. We confirm the practical benefit of this technique by applying it to an Rb vapor cell atomic clock, showing a measurable improvement in the clock’s long-term frequency stability by mitigating the instability induced by the light shift. This method offers a solution for miniaturized quantum sensors requiring stable, continuous-wave interrogation.

DOI
10.1364/optcon.585779

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We present a compact and power-efficient method for stabilizing the output power of a diode laser by leveraging its integrated temperature control. We demonstrate that this approach is highly effective in mitigating slow power drift. In particular, we verify that the power stabilization loop introduces negligible perturbation to the frequency stability and is even beneficial for an optimized gain. We confirm the practical benefit of this technique by applying it to an Rb vapor cell atomic clock, showing a measurable improvement in the clock’s long-term frequency stability by mitigating the instability induced by the light shift. This method offers a solution for miniaturized quantum sensors requiring stable, continuous-wave interrogation.
Light shift and vapor-cell temperature shift are the two most significant factors dominating the long-term instability of compact atomic clocks. Due to the different physical mechanisms, there is not yet a solution that can effectively suppress the frequency shifts induced by these two effects. Here, we propose a 'resonance-offset' locking approach that compensates for the two physical frequency shifts. In this approach, the additional offset locking shift can effectively counteract the atomic resonance shifts arising from changes in vapor-cell temperature and light power, reducing the net impact on the clock's frequency to nearly zero. We have demonstrated this strategy on the 778 nm Rubidium two-photon optical frequency standard, successfully compensating for light shift and cell-temperature shift, respectively. This general method is particularly appealing for compact vapor-cell microwave and optical atomic clocks designed for the excellent stability rather than accuracy.
The authors demonstrate a simple technique to significantly improve the long-term frequency stability of atomic clocks based on coherent population trapping (CPT). In this technique, the CPT fields are created by a modulated diode laser and a slow servo is used to actively tune the laser modulation index to a value where the light shift vanishes. The observed clock frequency at this modulation index is given by the rubidium hyperfine frequency when no light fields are present, and this makes the clock frequency largely insensitive to variations in laser properties. In addition to reducing stringent requirements on the long-term stabilities of laser temperature, laser frequency, and rf modulation power, this technique may also significantly reduce frequency drifts related to laser aging. In the experiment, they demonstrate improvement by over one order of magnitude in the stability of a clock that is limited by light-shift-induced frequency drifts.
We describe a novel technique for stabilizing frequency shifts in laser-interrogated vapor-cell atomic clocks. The method suppresses frequency shifts due to changes in the laser frequency, intensity, and modulation index as well as atomic vapor density. The clock operating parameters are monitored by using the atoms themselves, rather than by using conventional schemes for laser frequency and cell temperature control. The experiment is realized using a chip-scale atomic clock. The novel atomic-based stabilization approach results in a simpler setup and improved long-term performance.
Two-photon vapor cell-based optical clocks are strong candidates for next-generation portable atomic standards, offering simplicity, compactness, and high performance. Their narrow clock transitions with counter-propagating beams enable first-order Doppler-free operation. However, systematic perturbations such as the AC Stark shift, temperature-induced shift, and drifts resulting from the laser system pose challenges cause instabilities to medium- to long-term performance. This paper provides a comprehensive overview of Rb two-photon vapor cell optical standards, focusing on the long-term performance-limiting effects and potential mitigation strategies, aiming for clock stabilities better than 1 × 10−15 over the averaging time of a day and beyond.
We report on a narrow-linewidth diode laser source emitting at 780 nm, based on frequency doubling from 1.56 μm, which is frequency stabilized on the D2 transition line of Rubidium (Rb). This compact laser source shows a frequency stability of 2·10-12at 1 s and-12for τ up to 104s. This laser source is evaluated in a modular four-laser setup to identify and locate the sources of instabilities. In view of the lasers' applications to vapor-cell Rb atomic clocks, we also studied the various light-shift coefficients in a pulsed optically-pumped Rb clock. Finally, we evaluate the impact of the frequency and intensity instabilities of the frequency-doubled optical sources on the clock stability.
We develop a high-performance ultraviolet (UV) frequency stabilization technique implemented directly on UV diode lasers by combining the dichroic atomic vapor laser lock and the resonant transfer cavity lock. As an example, we demonstrate a stable locking with measured frequency standard deviations of approximately 200 kHz and 300 kHz for 399 nm and 370 nm diode lasers in 20 min. We achieve a long-term frequency drift of no more than 1 MHz for the target 370 nm laser within an hour, which is further verified with fluorescence count rates of a single trapped 171Yb+ ion. We also find strong linear correlations between lock points and environmental factors such as temperature and atmospheric pressure. Our approach provides a simple and stable solution at a relatively low cost, and features flexible control, high feedback bandwidth and minimal power consumption of the target UV laser.