期刊
PHOTONICS
卷 7, 期 1, 页码 -出版社
MDPI
DOI: 10.3390/photonics7010012
关键词
external-cavity diode laser; interference filter; laser diode; laser stabilization; space optical clock
类别
资金
- Major Scientific Instruments Project of China [61127901, 91636101]
- Young Scientists Fund of the National Natural Science Foundation of China [11403031]
- Open Research Fund of State Key Laboratory of Transient Optics and Photonics [SKLST201909]
- National Development Funding Project of China [61127901, 91636101]
The National Time Service Center of China is developing a compact, highly stable, 698 nm external-cavity diode laser (ECDL) for dedicated use in a space strontium optical clock. This article presents the optical design, structural design, and preliminary performance of this ECDL. The ECDL uses a narrow-bandwidth interference filter for spectral selection and a cat's-eye reflector for light feedback. To ensure long-term stable laser operation suitable for space applications, the connections among all the components are rigid and the design avoids any spring-loaded adjustment. The frequency of the first lateral rocking eigenmode is 2316 Hz. The ECDL operates near 698.45 nm, and it has a current-controlled tuning range over 40 GHz and a PZT-controlled tuning range of 3 GHz. The linewidth measured by the heterodyne beating between the ECDL and an ultra-stable laser with 1 Hz linewidth is about 180 kHz. At present, the ECDL has been applied to the principle prototype of the space ultra-stable laser system.
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