Active stabilization of multi-parameter in AMO experiments with a single digital servo

Zhou, Xiao-Long; Huang, Dong-Yu; Shen, Ze-Min; Pan, Yuhao; Li, Li; Liu, Yi-Jia; Wang, Jian; Li, Chuan‐Feng; Guo, Guang‐Can

doi:10.1016/j.optlastec.2023.109791

Cited by 3 publications

(1 citation statement)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The active feedback is utilized just to maintain the laser's operation within the self-injectionlocking regime. As a result, our method is considerably less resource-intensive in terms of feedback circuit bandwidth, complexity, and memory allocation compared to traditional optoelectronic systems associated with fiber lasers [39,40].…”

Section: Introductionmentioning

confidence: 99%

Sub-100-Hz DFB Laser Injection-Locked to PM Fiber Ring Cavity

Panyaev,

Itrin,

Korobko

et al. 2024

J. Lightwave Technol.

View full text Add to dashboard Cite

Low-noise lasers are invaluable tools in applications ranging from precision spectroscopy and displacement measurements to the development of advanced optical atomic clocks. Although all these applications benefit from reduced frequency noise, some also demand a low-cost and robust design. In this work, we introduce a novel and practical concept of a simple, single-frequency laser that utilizes a ring fiber cavity for self-injection locking of a standard semiconductor distributed feedback (DFB) laser. Contrary to previously reported solutions, our laser configuration is fully spliced from polarizationmaintaining (PM) single-mode optical fiber components. This results in an adjustment-and maintenance-free narrow-band laser operation with significantly enhanced stability against environmental noise. Importantly, continuous-wave (CW) singlefrequency laser operation is achieved through self-injection locking, while the low-bandwidth active optoelectronic feedback serves exclusively to maintain this regime. Operating with output powers of ~8 mW, the proposed fiber configuration narrows the natural Lorentzian linewidth of the emitted light to ~ 75 Hz and ensures phase and intensity noise levels of less than -120 dBc/Hz (> 10 kHz) and -140 dBc/Hz (> 30 kHz), respectively. Furthermore, the thermally stabilized laser exhibits a frequency drift of less than ~ 0.5 MHz/min with a maximal frequency walkoff of < 8 MHz. We believe that translating this laser design to integrated photonics in the near future could dramatically lower costs and reduce the footprint in various applications, including ultra-high-capacity fiber and data center networks, atomic clocks, and microwave photonics.

show abstract

Section: Introductionmentioning

confidence: 99%

Sub-100-Hz DFB Laser Injection-Locked to PM Fiber Ring Cavity

Panyaev,

Itrin,

Korobko

et al. 2024

J. Lightwave Technol.

View full text Add to dashboard Cite

show abstract

A digital servo for ultra-stable laser frequency stabilization

Liu,

Wang,

et al. 2024

Review of Scientific Instruments

View full text Add to dashboard Cite

We present a fully digital servo optimized for ultra-stable laser frequency stabilization. Experiments such as optical clock experiments can achieve high laser frequency stability, imposing high bandwidth, high precision, and low noise requirements on servo systems. The laser system utilizes the Pound–Drever–Hall method, employing an ultra-stable cavity to generate an error signal for servo input. The input is separated into two independent channels, with one channel featuring high feedback bandwidth and the other channel featuring high gain in the low-frequency domain. The process is fully digitized using field-programmable gate arrays with custom-made infinite impulse response filters and proportional-integral-derivative algorithms. Thanks to the low latency of 120.5 ns and low input noise of 3.22 × 10−12 V2/Hz@1 Hz, our digital servo can easily lock an external-cavity diode laser to a typical ultra-low expansion ultra-stable cavity. The laser system has a fractional frequency stability of 10−16@1s, with the servo electrical noise contributing only 5.54 × 10−18@1s.

show abstract