Automatic, long-term frequency-stabilized lasers with sub-hertz linewidth and 10−16 frequency instability

Yan, Chenggang; Shi, Haosen; Yao, Yuan; Yu, Hongfu; Jiang, Yanyi; Ma, Lei

doi:10.3788/col202220.070201

Cited by 9 publications

(4 citation statements)

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“…A Proportional Integral and Derivative (PID) controller is a control loop mechanism based on a negative feedback loop and widely used in a variety of applications [3,6]requiring continuously modulated control. Figure 1 below illustrates a closed loop system based on PID controller.…”

Section: -Pid Controllermentioning

confidence: 99%

“…On the other hand, digital PIDs are more flexible, easy to maintain, and when properly tuned, they are even capable of delivering better performance close to that of some purely analog regulators. In [3], an Analog-Digital hybrid PID controller has been proposed to automatically frequency-stabilize the lasers to their reference cavities. Analog circuits have been used for the PID controller, and Digital logic has been adopted to achieve automatic laser frequency locking, with a relock time of 0.3s when interruption happens.…”

Section: -Introductionmentioning

confidence: 99%

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Design of an FPGA-based PID controller with high-bandwidth and auto-relocking features: application to Sub-kHz external cavity diode lasers

Tatenguem Fankem,

Assmann,

Schmidtmann

et al. 2024

Laser Resonators, Microresonators, and Beam Control XXVI

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Narrow line width lasers with high stability are a key enabling technology in high-impact applications such as quantum technologies and laser surgery. On the one hand, stabilizing such lasers implies the design of efficient Proportional-Integral-Derivative (PID) controllers. On the other hand, high end applications require PID controllers with very high regulation bandwidth, relocking feature and easy to adjust parameters. In order to tackle these challenges, we designed and enhanced a PID controller using the pipeline technique. This allowed us to improve the sample rate at which the controller operates. The designed PID has been successfully used in a VBG based external-cavity for laser stabilization with ultra-narrow line width.

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Section: -Pid Controllermentioning

confidence: 99%

Section: -Introductionmentioning

confidence: 99%

Design of an FPGA-based PID controller with high-bandwidth and auto-relocking features: application to Sub-kHz external cavity diode lasers

Tatenguem Fankem,

Assmann,

Schmidtmann

et al. 2024

Laser Resonators, Microresonators, and Beam Control XXVI

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“…In 2022, a team of researchers at the Ytterbium Atomic Light Clock of East China Normal University, built an analog PID circuit and a microcontroller ultra-stable optical cavity system to pre-stabilize the clock laser, The lasers can be automatically frequency-stabilized to their reference cavities, and it can be relocked in 0.3 s when interruption happens. These automatic frequency-stabilized lasers are measured to have a frequency instability of 6 × 10 −16 at 1 s averaging time and a most probable linewidth of 0.3 Hz [27].…”

Section: Research Advancesmentioning

confidence: 99%

The application and development of laser frequency stabilization techniques for atomic clocks

Liu,

Guo,

Liu

et al. 2023

6th Optics Young Scientist Summit (OYSS 2023)

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Atomic clocks are precise devices that generate time and frequency signals by exploiting the inherent oscillation frequency of atoms. They have broad applications in fields such as aerospace navigation, global positioning, and precision metrology. Laser frequency stabilization techniques are crucial for ensuring the stable operation of atomic clocks, laser frequency stability directly impacts the performance of these clocks. This review presents the working principles, characteristics, and research progress of different laser frequency stabilization techniques, including saturation absorption spectroscopy stabilization, Pound-Drever-Hall technique, and modulation transfer spectroscopy stabilization. Additionally, it provides a perspective on the future advancement of laser frequency stabilization techniques in the atomic clock filed, which integral in the development of high-performance atomic clocks.

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“…Guo et al proposed the auto-lock algorithm to find the resonance point in a range slightly larger than an FSR (about 1.53 GHz), and the microcontroller scans the PZT in the step of 1 mv/ms, achieving auto-relock at 160 s after the system lost lock [13] . Yan et al perform a coarse sweep of the PZT with a step of 24 KHz/us to keep the laser output frequency close to the resonant frequency range, subsequently a fine sweep in the range of 12.3 MHz with a step of 7 60 Hz/us [14] . The current scanning step is determined by the relevant personnel manually scanning PZT for each laser before auto-lock.…”

Section: Introductionmentioning

confidence: 99%

Grid search algorithm applied to auto-lock of ultra-stable laser

Bu,

Jiao,

et al. 2023

Eighteenth National Conference on Laser Technology and Optoelectronics

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Ultra-stable laser with PDH (Pound-Drever-Hall) frequency stabilization technology is an indispensable tool in optical atomic clocks, gravitational wave detection, and optical fiber optical frequency transfer. As the demand for space and transportable science missions rises, the ultra-stable laser is required to have an auto-lock function. During auto-lock, the PZT is scanned in pre-set steps to find the resonance point with the optical reference cavity. To determine steps for the first lock automatically and update steps when pre-set steps are changed by long-term drift, the Grid Search algorithm with priori knowledge is utilized. To verify the reliability of the algorithm, the system out of lock is simulated 904 times. The relock with the parameters determined by the Grid Search algorithm is achieved with a success rate of 100% and a mean relock time of about 0.9s. The Grid Search algorithm with priori knowledge proposed in this paper can optimize the hyperparameters in auto-lock.

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Automatic, long-term frequency-stabilized lasers with sub-hertz linewidth and 10−16 frequency instability

Cited by 9 publications

References 0 publications

Design of an FPGA-based PID controller with high-bandwidth and auto-relocking features: application to Sub-kHz external cavity diode lasers

Design of an FPGA-based PID controller with high-bandwidth and auto-relocking features: application to Sub-kHz external cavity diode lasers

The application and development of laser frequency stabilization techniques for atomic clocks

Grid search algorithm applied to auto-lock of ultra-stable laser

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