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Light-induced frequency shifts for the lowest vibrational levels of ultracold Cs2 in the molecular pure long-range 0^-g state

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Frontiers of physics 2020年第2期15卷 57-62页

作者： Ji-Zhou Wu Yu-Qing Li Wen-liang Liu Jie Ma lian-tuan xiao Suo-Tang Jia State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Laser SpectroscopyShanxi UniversityTaiyuan 030006China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China College of Physics and Electronic Engineering Shanxi UniversityTaiyuan 030006China

The light-induced frequency shift(LIFS)of ultracold molecular ro-vibrational levels originates from the strong coupling of the atomic-scattering state and the bound-molecular *** this paper,we present our experimental determination of the LIFSs of the lowest vibrational levels(v=0,1)in the purely long-range 0^-g state of ultracold cesium molecules.A high-resolution double photoassociation spectroscopy is developed,which serves as frequency ruler to measure the frequency shifts of the lowest molecular levels for *** experimental results are qualitatively consistent with the theoretical expectations.

关键词： light-induced frequency shift ultracold molecule double photoassociation spectroscopy long-range state

Coherent 420 nm laser beam generated by four-wave mixing in Rb vapor with a single continuous-wave laser

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Chinese Physics B 2020年第4期29卷 253-257页

作者： Hao Liu Jin-Peng Yuan Li-Rong Wang lian-tuan xiao Suo-Tang Jia State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Laser SpectroscopyShanxi UniversityTaiyuan 030006China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

We demonstrate the generation of the coherent 420 nm laser via parametric four-wave mixing process in Rb vapor.A single 778 nm laser with circular polarization is directly injected into a high-density atomic vapor,which drives the atoms from the 5S1/2 state to the 5D5/2 state with monochromatic two-photon *** frequency up-conversion laser is generated by the parametric four-wave mixing process under the phase matching *** coherent laser is firstly certified by the knife-edge method and a narrow range grating *** the generated laser power is investigated in terms of the power and frequency of the incoming beam as well as the density of the ***,a 420 nm coherent laser with power of 19μW and beam quality of Mx^2=1.32,My^2=1.37 is obtained with optimal experimental *** novel laser shows potential prospects in the measurement of material properties,information storage,and underwater optical communication.

关键词： blue laser four-wave mixing frequency up-conversion

Modification of single molecule fluorescence using external fields

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Frontiers of physics 2017年第5期12卷 11-25页

作者： Rui-Yun Chen Guo-Feng Zhang Cheng-Bin Qin Yan Gao lian-tuan xiao Suo-Tang Jia State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Laser Spectroscopy Shanxi University Taiyuan 030006 China Collaborative Innovation Center of Extreme Optics S hanxi University Taiyuan 030006 China

Controlling and manipulating the fluorescence of single fluorophores is of great interest in recent years for its potential uses in improving the performance of molecular photonics and molecular electronics, such as in organic light-emitting devices, single photon sources, organic field-effect transistors, and probes or sensors based on single molecules. This review shows how the fluorescence emission of single organic molecules can be modified using local electromagnetic fields of metallic nanostructures and electric-field-induced electron transfer. Electric-field-induced fluorescence modulation, hysteresis, and the achievement of fluorescence switch are discussed in detail.

关键词： single molecules fluorescence modification external fields

Non-crossover sub-Doppler DAVLL in selective reflection scheme

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Chinese Physics B 2019年第8期28卷 190-194页

作者： Lin-Jie Zhang Hao Zhang Yan-Ting Zhao lian-tuan xiao Suo-Tang Jia State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Laser SpectroscopyShanxi UniversityTaiyuan 030006China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

We demonstrate a non-crossover sub-Doppler dichroic atomic vapor laser locking(DAVLL)in selective reflection scheme,which allows us to obtain a modulation-free laser locking with wide tuneable *** dependence of peak-to-peak amplitude,tuneable range and the slope near the zero-crossing point of error signal on the frequency shift induced by the magnetic fields are *** adjustable error signal by the varying external magnetic field can offer the laser locking from the order of tens MHz to hundreds *** ultimate dither of locked laser frequency is less than 0.5 *** square root of Allan variance of the error signals reaches a minimum of 3×10^-10 for an averaging time of 130 s.

关键词： reflection spectrum DAVLL sub-Doppler frequency stabilization

Measurement of Zeeman Shift of Cesium Atoms Using an Optical Nanofiber

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Chinese Physics Letters 2018年第8期35卷 24-27页

作者： Chuan-Biao Zhang Dian-Qiang Su Zhong-Hua Ji Yan-Ting Zhao lian-tuan xiao Suo-Tang Jia State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Laser SpectroscopyShanxi UniversityTaiyuan 030006 Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006

Nanofibers have many promising applications because of their advantages of high power density and ultralow saturated light intensity. We present here a Zeeman shift of the Doppler-broadened cesium D2 transition using a tapered optical nanofiber in the presence of a magnetic field. When a weak magnetic field is parallel to the propagating light in the nanofiber, the Zeeman shift rates for different circularly polarized spectra are *** the ＋component, the typical linear Zeeman shift rates of = 3 and = 4 ground-state cesium atoms are measured to be 3.10（±0.19） MHz/G and 3.91（±0.16） MHz/G. For the -component, the values are measured to be-2.81（±0.25） MHz/G, and-0.78（±0.28） MHz/G. The Zeeman shift using the tapered nanofiber can help to develop magnetometers to measure the magnetic field at the narrow local region and the dispersive signal to lock laser frequency.

关键词： Measurement of Zeeman Shift of Cesium Atoms Using an Optical Nanofiber

Enhancement of the photoassociation of ultracold atoms via a non-resonant magnetic field

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Chinese Physics B 2020年第8期29卷 239-242页

作者： Ji-Zhou Wu Yu-Qing Li Wen-liang Liu Peng Li xiao-Feng Wang Peng Chen Jie Ma lian-tuan xiao Suo-Tang Jia State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Laser SpectroscopyShanxi UniversityTaiyuan 030006China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China College of Physics and Electronics Engineering Shanxi UniversityTaiyuan 030006China

We report an effective method for enhancing the photoassociation of ultracold atoms using a non-resonant magnetic field,which enables the manipulation of the coupling between the wavefunctions of the colliding atomic pairs and the excited molecules.A series of photoassociation spectra are measured for different magnetic *** show that the photoassociation rate is significantly dependent on the non-resonant magnetic field.A qualitatively theoretical explanation is provided,and shows a good agreement with the experimental result.

关键词： photoassociation ultracold atoms magnetic field

Giant enhancement of photoluminescence emission in monolayer WS_(2)by femtosecond laser irradiation

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Frontiers of physics 2021年第1期16卷 143-150页

作者： Cheng-Bing Qin Xi-Long liang Shuang-Ping Han Guo-Feng Zhang Rui-Yun Chen Jian-Yong Hu lian-tuan xiao Suo-Tang Jia State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Laser SpectroscopyShanxi UniversityTaiyuan 030006China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

Monolayer transition metal dichalcogenides have emerged as promising mat erials for opt oelectTonic and nanophotonic ***,the low photoluminescence(PL)quantum yield(QY)hinders their various potential *** we engineer and enhance the PL intensity of monolayer WS_(2)by femtosecond laser *** than two orders of magnitude enhancement of PL intensity as compared to the as-prepared sample is ***,the engineering time is shortened by three orders of magnitude as compared to the improvement of PL intensity by continuous-wave laser *** on the evolution of PL spectra,we attribute the giant PL enhancement to the conversion from trion emission to exciton,as well as the improvement of the QY when exciton and trion are localized to the new-formed *** have created microstructures on the monolayer WS_(2)based on the enhancement of PL intensity,where the engineered structures can be stably stored for more than three *** flexible approach with the feature of excellent long-term storage stability is promising for applications in information storage,display technology,and opto electronic devices.

关键词： monolayers WS_(2) giant enhancement photoluminescence femtosecond laser irradiation micropatterning exciton trion quantum yield

Signatures for Coexistence of Monoclinic and Hexagonal Phases in GaTe Nanoflakes

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Chinese Journal of Chemical Physics 2022年第6期35卷 893-899,I0072,I0073页

作者： Hong-yan Yan Cheng-bing Qin lian-tuan xiao State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Laser SpectroscopyShanxi UniversityTaiyuan 030006China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

The burgeoning two-dimensional(2D)layered materials provide a powerful strategy to realize efficient light-emitting *** them,gallium telluride(Ga Te)nanoflakes,showing strong photoluminescence(PL)emission from multilayer to bulk crystal,relax the stringent fabrication requirements of ***,detailed knowledge on the optical properties of Ga Te varies as layer thickness is still *** we perform thickness-dependent PL and Raman spectra,as well as temperature-dependent PL spectra of Ga Te *** analysis reveals a spectroscopic signature for the coexistence of both the monoclinic and hexagonal phases in Ga Te *** understand the experimental results,we propose a crystal structure where the hexagonal phase is on the top and bottom of nanoflakes while the monoclinic phase is in the middle of the *** the basis of temperature-dependent PL spectra,the optical gap of the hexagonal phase is determined to be 1.849 eV,which can only survive under temperature higher than 200 K with the increasing phonon ***,the strength of exciton-phonon interaction of the hexagonal phase is estimated to be 1.24 me V/*** results prove the coexistence of dual crystalline phases in multilayer Ga Te nanoflakes,which may provoke further exploration of phase transformation in Ga Te materials,as well as new applications in 2D light-emitting diodes and heterostructure-based optoelectronics.

关键词： GaTe Hexagonal phase Monoclinic phase Photoluminescence

Transition Dipole Moment Measurements of Ultracold Photoassociated ^(85)Rb^(133)Cs Molecules by Depletion Spectroscopy

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Chinese Physics Letters 2018年第10期35卷 18-21页

作者： Juan-Juan Cao Ting Gong Zhong-Hao Li Zhong-Hua Ji Yan-Ting Zhao lian-tuan xiao Suo-Tang Jia State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Laser SpectroscopyShanxi UniversityTaiyuan 030006 Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006

The transition dipole moments（TDMs） of ultracold85 Rb133 Cs molecules between the lowest vibrational ground level, （X^1Σ~＋（ v= 0, J= 1）, and the two excited rovibrational levels, 2~3Π0＋（v′= 10, J′= 2） and 2~1Π1（v′= 22,J′= 2）, are measured using depletion spectroscopy. The ground-state85 Rb133 Cs molecules are formed from cold mixed component atoms via the 2~3Π0-（ v= 11, J= 0） short-range level, then detected by time-of-flight mass spectrum. A home-made external-cavity diode laser is used as the depletion laser to couple the ground level and the two excited levels. Based on the depletion spectroscopy, the corresponding TDMs are then derived to be 3.5（2）×10^（-3）eαα and 1.6（1）×10^（-2）eαα, respectively, where 0）（60 represents the atomic unit of electric dipole moment. The enhance of TDM with nearly a factor of 5 for the 21Π1（v′= 22, J′= 2） excited level means that it has stronger coupling with the ground level. It is meaningful to find more levels with much more strong coupling strength by the represented depletion spectroscopy to realize direct stimulated Raman adiabatic passage transfer from scattering atomic states to deeply molecular states.

关键词： TDM Cs Molecules by Depletion Spectroscopy Transition Dipole Moment Measurements of Ultracold Photoassociated Rb