Design and fabrication of a compact, high-performance interference-filter-based external-cavity diode laser for use in the China Space Station

Meng, Lingqiang; Zhao, Pengyang; Meng, Fanchao; Chen, Long; Xie, Yong; Wang, Yikun; Bian, Wei; Jia, Jianjun; Liu, Tao; Zhang, Shougang; Wang, Jianyu

doi:10.3788/col202220.021407

Cited by 10 publications

(3 citation statements)

References 20 publications

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“…2016年, 德国光梳生产厂家Menlo-System联合多家德国单位将飞秒光梳送上了太空 [15] [17] , 可以同时产生二级冷却光和搅拌光, 但该方案并未进行振动测试. 同年, 意大利比萨大学(University of Pisa)针对紧凑型Sr原子光钟研制了一种基于 Pr:GLF晶体的半导体泵浦固体激光器 [18] , 但同样未进行振动测试. 本次梦天舱中搭载的光钟系统所采用的超稳激光采用的是基于干涉滤光片的 ECDL [19] .…”

Section: 中国科学院国家授时中心于2016年开始空间光钟研究并于2018年完成了小型化sr原子光钟物理unclassified

Laser system of cold atom optical clock in China Space Station

Liu,

Wang,

et al. 2023

Acta Phys. Sin.

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The first space optical clock (SOC) in the world developed in China, which is composed by five subsystems, including an optical unit, a physics unit, an electronic control unit, a space optical frequency comb, and an ultrastable laser, has been successfully launched with the Mengtian space laboratory into the China Space Station (CSS). Compact and stable lasers are key elements for the operation of the SOC. The optical unit consists of 5 lasers at 461 nm, 679 nm, 689 nm, 707nm, and 813 nm. With a synchronous-tuning-like scheme, high quality external cavity diode lasers (ECDL) have been developed as the seeds. The linewidth of the lasers is suppressed to the order of 100 kHz, and the mode-hop-free tuning range reaches 20 GHz, which meet the requirements of the SOC. With careful mechanical and thermal design, the stability of the lasers against vibration and temperature fluctuation has been sufficiently promoted to confront the challenge of rocket launching. While the power from the ECDL is sufficient for 679 nm and 707 nm repump lasers, additional injection lock is utilized for the 461 nm and 689 nm lasers to amplify the power of the seeds to more than 600 mW, so that efficient first and second stage Doppler cooling can be achieved. To generate an optical lattice with deep enough potential well, over 800 mW 813 nm lasers is required. Therefore, a semiconductor tapered amplifier is adopted to amplify the seed to more than 2 W, so as to cope with various losses of the coupling optics. The wavelength and output power of the 5 lasers are monitored and feedback-controlled by the electronic control unit. All the modules are designed and manufactured as orbital replaceable units, which can be easily replaced by astronauts in case failure occurs. Now the lasers are all turned on and operates normally in CSS. More data of the SOC will be obtained in the near future. At present stage, according to our evaluation, the continuous operation time of the SOC is limited by the injection locked lasers, which are relatively vulnerable to mode hopping. Hopefully this problem can be solved by improving the laser diode manufacturing technology, or developing fiber lasers with compact frequency conversion modules.

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Section: 中国科学院国家授时中心于2016年开始空间光钟研究并于2018年完成了小型化sr原子光钟物理unclassified

Laser system of cold atom optical clock in China Space Station

Liu,

Wang,

et al. 2023

Acta Phys. Sin.

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“…During aerospace missions, it is imperative to perform vibration tests on the FP cavity, which is one of the weakest components of a USL. Table 1 displays the parameters for random vibration testing using the Long March 5 rocket platform [36]. The test consists of three successive stages: rising, holding, and falling.…”

Section: Analysis Of Cavity Length Change Under the Random Vibration ...mentioning

confidence: 99%

Multi-Physics and Multi-Objective Optimization for Fixing Cubic Fabry–Pérot Cavities Based on Data Learning

Zhao,

Meng,

Wang

et al. 2023

Applied Sciences

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The Fabry–Pérot (FP) cavity is the essential component of an ultra-stable laser (USL) for gravitational wave detection, which couples multiple physics fields (optical/thermal/mechanical) and requires ultra-high precision. Aiming at the deficiency of the current single physical field optimization, a multi-physics and multi-objective optimization method for fixing the cubic FP cavity based on data learning is proposed in this paper. A multi-physics coupling model for the cubic FP cavity is established and the performance is obtained via finite element analysis. The key performance indices (V, wF, wF) and key design variables (d, l, F) are determined considering the features of the FP cavity. Different data learning models (NN, RSF, KRG) are established and compared based on 49 sets of data acquired by orthogonal experiments, with the results showing that the neural network has the best performance. NSGA-II is adopted as the optimization algorithm, the Pareto optimal front is obtained, and the optimal combination of design variables is finally determined as {5,32,250}. The performance after optimization proves to be greatly improved, with the displacement under the fixing force and vibration test both decreased by more than 60%. The proposed optimization strategy can help in the design of the FP cavity, and could enlighten other optimization fields as well.

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“…2020 Linbo Zhang et al [16] developed an IFstabilized external-cavity diode laser for space applications. 2022 Lingqiang Meng et al [17] developed IF-ECDL to pass the aerospace environmental tests, indicating that the IF-ECDL is suitable for space missions in the China Space Station (CSS).…”

Section: Introductionmentioning

confidence: 99%

Interference filter based external-cavity diode laser with combined dual interference filters and largely adjustable feedback range

Chang,

He,

Wang

2023

Phys. Scr.

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External-cavity diode lasers (ECDL) are widely used as light sources in laser spectroscopy, atomic physics, and quantum optics. This study demonstrated a home-made 852–nm ECDL with variable feedback, using the combined dual narrow-band interference filters (IFs) as the laser longitudinal mode selection element. The combination of narrow-band IFs, mainly for the current commercially available narrow-band IFs with the full width at half maximum (FWHM) of approximately 0.5 nm for 780-895 nm. We designed different narrow-band IFs combinations to achieve a narrower FWHM, and applied them in the ECDL. The combination of the dual narrow-band IFs further reduces the laser linewidth. We measured the laser linewidth using a high-finesse Fabry-Perot cavity with a linewidth of approximately 10 kHz. The laser linewidth is approximately 176 kHz for the Single-IF-ECDL and 96 kHz for the Dual-IF-ECDL with the same feedback. In addition, we have experimentally verified the results of narrower laser linewidth and larger tuning range with increase in the feedback. The developed Dual-IF-ECDL has the capability of narrow linewidth and wavelength tunability and can be applied to precision spectroscopy, cooling and trapping of neutral atoms.

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Design and fabrication of a compact, high-performance interference-filter-based external-cavity diode laser for use in the China Space Station

Cited by 10 publications

References 20 publications

Laser system of cold atom optical clock in China Space Station

Laser system of cold atom optical clock in China Space Station

Multi-Physics and Multi-Objective Optimization for Fixing Cubic Fabry–Pérot Cavities Based on Data Learning

Interference filter based external-cavity diode laser with combined dual interference filters and largely adjustable feedback range

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