Innovative progress in the development of the national time-honored center
Recently, the quantum frequency standard research team led by Zhang Shougang, director of the National Time Service Center, has made important progress in the study of optical frequency standards. The team's Shuguangzhong research group, under the guidance of Chang Hong's researcher, successfully selected and amplified the optical frequency comb (referred to as optical comb) mode, successfully produced a single-mode narrow linewidth laser source through optical combing, and applied it. The Shuguang Bell device system achieves narrow linewidth cooling and clock transition frequency measurement of helium atoms. The research results are published in the topic "Selection and amplification of a single optical frequency comb mode for laser cooling of the strontium atoms in an optical clock" on the Applied Physics Letters (Appl. Phys. Lett. 107). , 151104 (2015)). The first author of the article is Liu Hui, a doctoral student.
Shuguangzhong is the world's highest accuracy and stability optical frequency standard. Its development usually requires six different wavelength laser sources, and the system is complex and huge. By applying the method and the technology, all the light sources of the calender clock can be generated by using only one set of optical combs, which greatly simplifies the neon clock system, and is especially suitable for the development of the space optical clock. The research was supported by the National Natural Science Foundation of China's major instrument special "new generation time frequency system" and the surface project "two-electron atomic coherence and its application in optical frequency standards".
Concerned about surprises
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