AI Insight
Researchers have developed a compact 75-mL atom-filtered laser system that maintains precise alignment with atomic transitions while achieving significant size reduction. The key innovation is a micro Faraday anomalous dispersion optical filter operating in an extreme hyperfine regime, which produces a wider 7.5 GHz transmission window compared to conventional filters with sub-GHz windows. This wider window enables a 30-fold volume reduction while maintaining exceptional power stability and frequency stability of 3 x 10^-13 at 10,000 seconds.
Why it matters
The miniaturized laser system addresses a critical bottleneck in deploying quantum technologies outside laboratory settings. Its compact size, stability under environmental shocks, and turn-key operation make quantum devices like atomic clocks and sensors practical for field deployment in navigation, communications, and other applications requiring precise atomic references.
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⚠️ Preprint – Noch nicht peer-reviewed
Dieser Artikel wurde noch nicht von unabhängigen Experten begutachtet. Die Ergebnisse sind vorläufig und sollten mit Vorsicht interpretiert werden.
Abstract: Numerous quantum devices require lasers strictly locked to atomic transitions. Atom-filtered lasers (AFLs) are considered a leading candidate for quantum device laser sources due to their ability to self-align to atomic transitions. However, the sub-GHz sharp transmission spectra of conventional atomic filters impose constraints on both laser miniaturization and output stability. Herein, we demonstrate a micro Faraday anomalous dispersion optical filter ({mu}FADOF) operating within the extreme hyperfine Paschen-Back regime, generating a 7.5 GHz flat-top transmission window. By integrating this filter, the miniaturization bottleneck of the AFLs is overcome, achieving a 30-fold volume reduction to a compact package volume of 75 mL. Simultaneously, investigations into the optical self-feedback characteristics of the {mu}FADOF reveal a stable operating regime, where the optical self-feedback of the atomic filter acts as a stabilizing mechanism, enabling the laser to achieve a power instability of 9 x 10^-6 at 1 s and 3.2 x 10^-5 at 8400 s. The optical frequency standard based on this 75-mL AFL achieves a further improvement in long-term frequency stability to 3 x 10^-13 at 10000 s and maintains turn-key operation under environmental shocks, highlighting the critical role of this laser in the development of deployable quantum devices.
Source: A 75-mL intrinsically stable atom-filtered laser enabling deployable quantum devices