http://hdl.handle.net/20.500.11897/497324 State Key Laboratory of Advanced Optical Communication Systems and Networks Mon, 08 Jul 2024 11:34:00 GMT 2024-07-08T11:34:00Z http://hdl.handle.net/20.500.11897/712896 Title: 高性能磁选态光检测铯原子钟的研究 Authors: 李源昊; 陈思飞; 刘晨; 范利锋; 王延辉 Abstract: 介绍了一种新型的可搬运铯原子钟，采用非均匀磁场进行选态，采用与4-5循环跃迁线共振的激光进行检测。介绍了此方案的物理系统、光学系统和电路系统。进一步展示了基于此方案原子钟的整机与指标，最佳整机体积4U,稳定度达到4×10~(-13)@100 s, 4.5×10~(-14)@10 000 s, 2.2×10~(-14)@1 d,优于可搬运铯钟典型产品5071A优质型。将此方案与磁选态磁检测铯原子钟和光抽运铯原子钟进行了对比，并给出了此方案的优点与待解决的问题。最后介绍了两种针对磁选态光检测铯钟的可行性改善，一种为采用3-2循环跃迁线检测的反选型原子钟，一种为采用光抽运-磁选态的混合选态型原子钟，有望进一步提升稳定度指标至稳定度低于3×10~(-13)@100 s。; 介绍了一种新型的可搬运铯原子钟，采用非均匀磁场进行选态，采用与4-5循环跃迁线共振的激光进行检测。介绍了此方案的物理系统、光学系统和电路系统。进一步展示了基于此方案原子钟的整机与指标，最佳整机体积4U,稳定度达到4×10~(-13)@100 s, 4.5×10~(-14)@10 000 s, 2.2×10~(-14)@1 d,优于可搬运铯钟典型产品5071A优质型。将此方案与磁选态磁检测铯原子钟和光抽运铯原子钟进行了对比，并给出了此方案的优点与待解决的问题。最后介绍了两种针对磁选态光检测铯钟的可行性改善，一种为采用3-2循环跃迁线检测的反选型原子钟，一种为采用光抽运-磁选态的混合选态型原子钟，有望进一步提升稳定度指标至稳定度低于3×10~(-13)@100 s。 Thu, 15 Feb 2024 00:00:00 GMT http://hdl.handle.net/20.500.11897/712896 2024-02-15T00:00:00Z http://hdl.handle.net/20.500.11897/712895 Title: 窄线宽外腔半导体激光器研究进展 Authors: 秦晓敏; 史田田; 王志洋; 史航博; 陈景标 Abstract: 窄线宽外腔半导体激光器具有结构简单、可调谐、噪声低等优势，广泛应用于量子精密测量、光通信、激光雷达等领域。根据外腔选频器件的不同，本文主要介绍光栅型激光器、干涉滤光型激光器、波导型激光器和法拉第激光器四类外腔半导体激光器，分析各类激光器的基本结构与选频机制、介绍各自的优缺点以及国内外研究进展。其中，前三类激光器采用非量子器件进行频率选择，而法拉第激光器利用共振法拉第旋光效应选频，输出波长直接对应原子跃迁谱线，对激光二极管的电流与温度变化具有良好的鲁棒性。随后介绍外腔半导体激光器的应用情况，尤其是在精密测量领域中的典型应用。最后总结并展望窄线宽外腔半导体激光器的未来发展方向。; 窄线宽外腔半导体激光器具有结构简单、可调谐、噪声低等优势，广泛应用于量子精密测量、光通信、激光雷达等领域。根据外腔选频器件的不同，本文主要介绍光栅型激光器、干涉滤光型激光器、波导型激光器和法拉第激光器四类外腔半导体激光器，分析各类激光器的基本结构与选频机制、介绍各自的优缺点以及国内外研究进展。其中，前三类激光器采用非量子器件进行频率选择，而法拉第激光器利用共振法拉第旋光效应选频，输出波长直接对应原子跃迁谱线，对激光二极管的电流与温度变化具有良好的鲁棒性。随后介绍外腔半导体激光器的应用情况，尤其是在精密测量领域中的典型应用。最后总结并展望窄线宽外腔半导体激光器的未来发展方向。 Mon, 05 Feb 2024 00:00:00 GMT http://hdl.handle.net/20.500.11897/712895 2024-02-05T00:00:00Z http://hdl.handle.net/20.500.11897/712770 Title: A Faraday laser locked to <SUP>87</SUP>Rb D₂ line Authors: Gao, Zhihong; Ge, Zheyi; Shi, Tiantian; Zhu, Chuanwen; Qin, Xiaomin; Chen, Jingbiao Abstract: We present a single-frequency Faraday laser utilizing a 5-Torr-Ar-mixed 85Rb atomic filter as a frequencyselecting element, and lock it to 87Rb D2 line via modulation transfer spectroscopy (MTS). The wavelength of the free-running Faraday laser fluctuated between 780.2457 and 780.2470 nm, which was limited within the ultra-narrow transmission bandwidth (700 MHz) of the atomic filter. When the Faraday laser was stabilized to 87Rb 52S1/2 F = 2 -> 52P3/2 F ' = 3 hyperfine transition line, the output wavelength of the laser was approximately 780.24602 nm, and the fractional frequency Allan deviation measured by residual error signal arrived at 2.87 x 10-14 at 1 s, then reached 1.25 x 10-14 at 100 s. The laser system is easy to be locked to 87Rb D2 line within the current range of laser diode (LD) from 75 to 140 mA, which has the potential to achieve a "turnkey" systems and is suitable for laser-pumped rubidium atomic clocks and laser-cooling experiments. Thu, 01 Aug 2024 00:00:00 GMT http://hdl.handle.net/20.500.11897/712770 2024-08-01T00:00:00Z http://hdl.handle.net/20.500.11897/712759 Title: Chiral spontaneous emission propagation based on a honeycomb photonic crystal slab Authors: Qian, Zhiyuan; Yin, Xuefan; Zhou, Xinyi; Wang, Feifan; Chen, Ye; Peng, Chao Abstract: We propose the direction-tunable chiral photonic propagation of spontaneous emission based on magnetic helicity and finite-size effect in a topological honeycomb photonic crystal slab. The chiral edge state channels are excited by emitters with magnetic polarization due to the C6 symmetry, where their propagation directions are tuned by the emitter's position on the magnetic helicity pattern. Meanwhile, the finite size of the honeycomb photonic crystal brings chirality oscillation, which also decides the chirality of photonic propagation. This method of controlling chiral transport in two-dimensional designs can be extended to a three-dimensional silicon-based photonic crystal slab containing a silver split ring resonator as the emitter providing spontaneous emission, which is convenient to fabricate via existing nanotechnology. Moreover, we show the magnetic Purcell effect with chiral transport in the three-dimensional topological PC slab structure. Our research reduces the threshold of on-chip photonic transmission under topological protection, which is helpful for single-photon sources, photonic integrated chip manufacturing, and quantum information processing. Sat, 01 Jun 2024 00:00:00 GMT http://hdl.handle.net/20.500.11897/712759 2024-06-01T00:00:00Z