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BaF radical： A promising candidate for laser cooling and magneto-optical trapping

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Chinese Physics B 2017年第3期26卷 321-329页

作者：许亮魏斌夏勇邓联忠印建平 State Key Laboratory of Precision Spectroscopy School of Physics and Materials Science East China Normal University Shanghai 200062 China

Recently, there have been great interest and advancement in the field of laser cooling and magneto-optical trapping of molecules. The rich internal structure of molecules naturally lends themselves to extensive and exciting applications. In this paper, the radical 138Ba19F, as a promising candidate for laser cooling and magneto-optical trapping, is discussed in *** highly diagonal Franck-Condon factors between theX2∑＋1/2and A2∏1/2states are first confirmed with three different methods. Afterwards, with the effective Hamiltonian approach and irreducible tensor theory, the hypertine structure of theX2∑＋1/2state is calculated accurately. A scheme for laser cooling is given clearly. Besides, the Zeeman effects of the upper （ A2∏1/2）andlower（X2∑＋1/2）levels are also studied, and their respective g factors are obtained under a weak magnetic field. Its large g factor of the upper stateA2∏1/2is advantageous for magneto-optical trapping. Finally, by studying Stark effect of BaFin theX2∑＋1/2, we investigate the dependence of the internal effective electric field on the applied electric field. It is suggested that such a laser-cooled BaF is also a promising candidate for precision measurement of electron electric dipole moment.

关键词： laser cooling magneto-optical trapping BaF radical

Ab initio study on the electronic states and laser cooling of AlCl and AlBr

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Chinese Physics B 2016年第4期25卷 92-97页

作者：杨荣唐斌高涛 College of Materials Science and Engineering Chongqing Jiaotong University Institute of Atomic and Molecular Physics Sichuan University Institute of Finance & Trade Chongqing City Management College

We investigate whether A1C1 and A1Br are promising candidates for laser cooling. We report new ab initio calculations on the ground state X1E＋ and two low-lying states （A1H and a3H） of A1C1 and A1Br. The calculated spectroscopic constants show good agreement with available theoretical and experimental results. We also obtain the permanent dipole moments （PDMs） curve at multi-reference configuration interaction （MRCI） level of theory. The transition properties of A1H and a3H states are predicted, including the transition dipole moments （TDMs）, Franck-Condon factors （FCFs）, radiative times and radiative width. The calculated radiative lifetimes are of the order of a nanosecond, implying that they are sufficiently short for rapid laser cooling. Both A1C1 and A1Br have highly diagonally distributed FCFs which are crucial requirement for molecular laser cooling. The results demonstrate the feasibility of laser cooling A1C1 and A1Br, and we propose laser cooling schemes for A1C1 and A1Br.

关键词： A1C1 AIBr laser cooling

Cavity-enhanced laser cooling of solid-state materials in a standing-wave cavity

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Chinese Optics Letters 2008年第11期6卷 848-851页

作者：贾佑华钟标印建平 State Key Laboratory of Precision Spectroscopy.East China Normal University.Shanghai 200062

We propose a new method to cool the yb^3＋-doped ZBLANP glass in a standing-wave cavity. There are two advantages of this cavity-enhanced technique： the pumping power is greatly enhanced and the absorption of the cooling material is greatly increased. We introduce the basic principle of the cavity-enhanced laser cooling and discuss the cooling effect of a solid-state material in a cavity. From the theoretical study, it is found that the laser cooling effect is strongly dependent on the reflectivity of the cavity mirrors, the length of the solid material, the surface scattering of the material, and so on. Some optimal parameters for efficient laser cooling are obtained.

关键词： laser cooling lasers Mirrors Standing wave meters Ytterbium

Characterization of laser cooling in microgravity via long-term operations in TianGong-2 space lab

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National Science Review 2023年第4期10卷 69-75页

作者： De-Sheng Lü Wei Ren Yuan Sun Tang Li Qiu-Zhi Qu Bin Wang Lin Li Jian-Bo Zhao Xin Zhao Jing-Wei Ji Mei-Feng Ye Jing-Feng Xiang Wei-Biao Chen Yu-Zhu Wang Liang Liu CAS Key Laboratory of Quantum Optics and Center of Cold Atom Physics Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Aerospace laser Engineering Department Shanghai Institute of Optics and Fine MechanicsChinese Academy of Sciences

The invention of laser cooling has fundamentally influenced the research frontier of atomic physics and quantum physics, and recently an intense focus has been on the studies of cold atom physics in microgravity environments. Herein, we report the results of our laser cooling experiment in Tian Gong-2 space lab, which operated for 34 consecutive months in orbit. Over such an extended operation time, the quality of laser cooling did not experience any significant decline, while the properties of laser cooling in orbital microgravity were systematically studied. In particular, we demonstrate magneto-optical trapping and polarization-gradient cooling in orbit and carefully examine their performances. A comparison of the in-orbit and on-ground results indicates that a higher cooling efficiency exists in microgravity, including a smaller loss rate during the trapping and cooling process and lower ultimate temperature of laser-cooled atoms. Our progress has laid the technical foundations for future applications of cold atoms in space missions with operation times of the order of years.

关键词： laser cooling polarization-gradient cooling orbital microgravity space lab

Two Kinds of Cavity Geometry for Enhanced laser cooling of Solids

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Chinese Physics Letters 2010年第7期27卷 83-86页

作者：贾佑华钟标印建平 Science College Shanghai Second Polytechnic University Shanghai 201209 State Key Laboratory of Precision Spectroscopy East China Normal University Shanghai 200062

We present a comparison between intracavity cooling and external cavity cooling for optical refrigeration. The results show that the intracavity scheme is preferred at low optical densities （〈 0.008）, while the external cavity scheme is preferred at higher optical densities （〉 0.01）. We can choose the proper scheme for different eases in experiments. Moreover, under the same conditions, taking Yb^3＋-doped ZBLAN （ZrF4-BaF2-LaF3-AlFa-NaF） film as an example, the cooling processes of the two scheme are obtained. The calculated results show that intracavity cooling will achieve a larger temperature drop for a thin film sample. Finally, the diode laser may become a candidate for the intraeavity model briefly discussed.

关键词： CAVITATION laser cooling SOLIDS GEOMETRY REFRIGERATION & refrigerating machinery SCHEMES (Algebraic geometry) THIN films

Engineering steady-state entanglement for two atoms held in separate cavities through laser cooling

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Chinese Physics B 2014年第4期23卷 109-112页

作者：沈利托陈荣鑫吴怀志杨贞标 Laboratory of Quantum Optics Department of Physics Fuzhou University

We propose a scheme to prepare the steady-state entanglement for two atoms, which are held in separate cavities that are coupled through a short optical fiber or optical resonator. The entangled steady-state with a high fidelity can be achieved even with a low cooperativity parameter, by making use of the driving laser fields. Such a cooling mechanism is based on a resonant laser pump of the unwanted ground states to the excited states, which finally decay to the desired steady-state.

关键词： laser cooling steady-state entanglement optical fiber

Polarization spectroscopy of the 1S0-3P1 transition of mercury isotopes at 253.7 nm

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Chinese Optics Letters 2015年第7期13卷 110-114页

作者：付小虎刘亢亢赵儒臣苟唯孙剑芳徐震王育竹 Key Laboratory for Quantum Optics Shanghai Institute of Optics and Fine MechanicsChinese Academy of Sciences University of Chinese Academy of Science Center for Cold Atom Physics Chinese Academy of Sciences

We experimentally observe polarization spectroscopy （PS） of the 1S0-3P1 transition of mercury atom gases at 253.7 nm. The PS signal can be observed in all six richly abundant isotopes and the PS signal of six transitions for laser cooling are all clear and of a dispersive line shape. The optimized pump power and probe power are found for the PS of 202 Hg. We find the linearly polarized component in the pump beam will distort the original P S signal due to the use of linear PS. Consequently, the purity of the pump beam is crucial to laser frequency stabilization by PS.

关键词： Frequency stability Isotopes laser cooling Mercury (metal) Pumping (laser) Spectroscopy

Efficient loading of ultracold sodium atoms in an optical dipole trap from a high power fiber laser

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Chinese Physics B 2021年第3期30卷 237-241页

作者： Jing Xu Wen-Liang Liu Ning-Xuan Zheng Yu-Qing Li Ji-Zhou Wu Peng Li Yong-Ming Fu Jie Ma Lian-Tuan Xiao Suo-Tang Jia State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Laser SpectroscopyCollege of Physics and Electronics EngineeringShanxi UniversityTaiyuan 030006China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

We report on a research of the loading of ultracold sodium atoms in an optical dipole trap,generated by two beams from a high power fiber *** effects of optical trap light power on atomic number,temperature and phase space density are experimentally investigated.A simple theory is proposed and it is in good accordance with the experimental results of the loaded atomic *** a general estimation,an optimal value for each beam with a power of 9 W from the fiber laser is *** results provide a further understanding of the loading process of optical dipole trap and laid the foundation for generation of a sodium Bose–Einstein condensation with an optical dipole trap.

关键词： optical dipole trap laser cooling high power fiber laser

Ground state cooling of an optomechanical resonator with double quantum interference processes

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Chinese Physics B 2021年第2期30卷 268-275页

作者： Shuo Zhang Tan Li Qian-Hen Duan Jian-Qi Zhang Wan-Su Bao Henan Key Laboratory of Quantum Information and Cryptography SSF IEUZhengzhouHenan 450001China Innovation Academy for Precision Measurement Science and Technology Wuhan 430071China Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China

We present a cooling scheme with a tripod configuration atomic ensemble trapped in an optomechanical *** the employment of two different quantum interference processes,our scheme illustrates that it is possible to cool a resonator to its ground state in the strong cavity-atom coupling ***,with the assistance of one additional energy level,our scheme takes a larger cooling rate to realize the ground state *** addition,this scheme is a feasible candidate for experimental applications.

关键词： laser cooling coherent optical effects multiphoton processes optomechanics