Dr. Jun He Profile

Dr. Jun He

at Shanxi Univ

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Author

Publications (11)

Proceedings Article | 13 May 2019 Presentation

Indistinguishability of 852 nm single-photon source based on a single cesium atom trapped in a magic wavelength optical tweezer (Conference Presentation)

Junmin Wang, Bei Liu, Rui Sun, Jiachao Wang, Xin Wang, Gang Jin, Jun He

Proceedings Volume 11027, 110270I (2019) https://doi.org/10.1117/12.2520710

KEYWORDS: Optical tweezers, Cesium, Chemical species, Iron, Silicon, Single photon detectors, Single photon

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Proceedings Article | 23 May 2018 Presentation

Realization of a watt-level narrow-linewidth 318-nm UV laser and single-photon Rydberg excitation of cesium atoms (Conference Presentation)

Junmin Wang, Jieying Wang, Jiandong Bai, Jun He

Proceedings Volume 10684, 106840S (2018) https://doi.org/10.1117/12.2306406

KEYWORDS: Ultraviolet radiation, Cesium, Chemical species, Fiber lasers, Laser applications, Tunable lasers, Alkali metals, Laser systems engineering, Laser stabilization, Logic devices

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Nowadays the long-range dipole-dipole interaction between highly-excited Rydberg atoms at micrometer distance become promising way to establish the atom-atom quantum entanglement and to implement the two-qubit logic gate. For alkali metal atoms, single-photon excitation from the ground state to the desired Rydberg state demands powerful narrow-linewidth ultra-violet (UV) laser, which is very challenging. Maybe just because of this, the studies of single-photon Rydberg excitation of alkali metal atoms are rare. Alternatively people have employed the two-photon or three-photon Rydberg excitation scheme. However, comparing with the single-photon Rydberg excitation, the two-photon or three-photon scheme has following drawbacks: atomic decoherence due to the photon scattering from the lower and upper transitions, and light shift of the involved ground state and Rydberg state due to the lower and upper transition laser beams. Thanks to the efficient laser frequency conversion technology with PPXX material and the well-developed commercial fiber laser as well as fiber amplifier, we have implemented a tunable 318.6-nm UV laser system based on the cavity-enhanced second-harmonic generation following the single-pass sum-frequency generation of 1560.5-nm and 1076.9-nm fiber-amplified lasers. More than 2-Watt output of the 318.6-nm UV laser has been achieved with a typical linewidth of smaller than 10 kHz. Employing the UV laser system we have demonstrated a single-photon Rydberg excitation spectroscopy of cesium (Cs) atoms. Partial Cs atoms can be directly excited from 6S_1/2 ground state to nP_3/2 (n = 70 - 100) Rydberg states, and Rydberg excitation spectra are obtained with transmission enhancement of a probe beam locked to Cs 6S_1/2 (F = 4) - 6P_3/2 (F’ = 5) cycling transition because partial population on the ground state (F = 4) are transferred to Rydberg state. The quantum defect for Cs nP_3/2 (n = 70 -100) Rydberg states is determined experimentally. Further more, the demodulated single-photon Rydberg excitation spectrum is employed to stabilize the UV laser to specific Cs Rydberg transition to improve the laser frequency stability. References: [1] Opt. Express 25 (2017) p.22510; [2] J. Opt. 19 (2017) 045501; [3] J. Opt. Soc. Am. B 33 (2016) p.2020; [4] Opt. Commun. 370 (2016) p.150. Funding: the National Natural Science Foundation of China (61475091).

Proceedings Article | 3 August 2016 Presentation

Preparation of 5.6dB vacuum squeezing on 795nm rubidium D1 line via an OPO (Conference Presentation)

Junmin Wang, Yashuai Han, Xin Wen, Baodong Yang, Yanhua Wang, Jun He

Proceedings Volume 9900, 990016 (2016) https://doi.org/10.1117/12.2227484

KEYWORDS: Ultraviolet radiation, Optical parametric oscillators, Crystals, Rubidium, Quantum optics, Second-harmonic generation, Laser optics, Continuous wave operation, Quantum memory, Current controlled current source

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Proceedings Article | 1 May 2014 Paper

Nearly deterministic loading of a single cesium atom in a magneto-optical trap and in a microscopic optical tweezer by feedback control

Bei Liu, Jun-Min Wang, Wen-Ting Diao, Jie-Ying Wang, Gang Jin, Jun He

Proceedings Volume 9136, 91362O (2014) https://doi.org/10.1117/12.2052085

KEYWORDS: Chemical species, Optical tweezers, Feedback control, Cesium, Photon counting, Luminescence, Magnetism, Quantum optics, Quantum information, Quantum computing

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Proceedings Article | 8 May 2013 Paper

Frequency doubling of cw 1560nm laser with single-pass, double-pass and cascaded MgO:PPLN crystals and frequency locking to Rb D2 line

Shanlong Guo, Junmin Wang, Yashuai Han, Jun He

Proceedings Volume 8772, 87721B (2013) https://doi.org/10.1117/12.2016839

KEYWORDS: Crystals, Second-harmonic generation, Laser crystals, Laser stabilization, Waveguides, Rubidium, Quantum cascade lasers, Semiconductor lasers, Continuous wave operation, Nonlinear crystals

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Proceedings Article | 6 May 2013 Paper

Measurement of hyperfine splitting and determination of hyperfine structure constant of cesium 8S1/2 state by using of ladder-type EIT

Jie Wang, Junmin Wang, Huifeng Liu, Baodong Yang, Jun He

Proceedings Volume 8773, 877311 (2013) https://doi.org/10.1117/12.2016842

KEYWORDS: Cesium, Laser beam diagnostics, Magnetism, Error analysis, Doppler effect, Calibration, Beam splitters, Polarization, Semiconductor lasers, Confocal microscopy

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Proceedings Article | 29 November 2012 Paper

Two kinds of high-contrast optical filters for the detection of Stokes and anti-Stokes photons from cesium ensemble

Tingting Liu, Qiangbing Liang, Jun He, Junmin Wang

Proceedings Volume 8554, 85541F (2012) https://doi.org/10.1117/12.999891

KEYWORDS: Fabry–Perot interferometers, Photons, Cesium, Optical filters, Laser beam diagnostics, Chemical species, Pulsed laser operation, Solids, Temperature metrology, Raman spectroscopy

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Proceedings Article | 29 November 2012 Paper

Optimization of the experimental parameters of cesium CPT system

Zhi Liu, Jieying Wang, Wenting Diao, Jun He, Junmin Wang

Proceedings Volume 8554, 85541G (2012) https://doi.org/10.1117/12.999897

KEYWORDS: Cesium, Neon, Magnetism, Chemical species, Stereolithography, Iron, Temperature metrology, Superposition, Semiconductor lasers, Polarization

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Proceedings Article | 29 November 2012 Paper

Towards coherent manipulation of the ground states of single cesium atom confined in a microscopic far-off-resonance optical dipole trap

Wenting Diao, Jun He, Bei Liu, Junmin Wang

Proceedings Volume 8554, 855408 (2012) https://doi.org/10.1117/12.999887

KEYWORDS: Chemical species, Cesium, Quantum communications, Semiconductor lasers, Magnetism, Photons, Polarization, Clocks, Superposition, Bragg cells

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Proceedings Article | 4 May 2012 Paper

Magic-wavelength optical dipole trap of cesium and rubidium atoms

Junmin Wang, Yongjie Cheng, Shanlong Guo, Baodong Yang, Jun He

Proceedings Volume 8440, 84400Q (2012) https://doi.org/10.1117/12.922113

KEYWORDS: Chemical species, Fiber lasers, Cesium, Second-harmonic generation, Rubidium, Fiber amplifiers, Laser systems engineering, Laser scattering, Crystals, Polarizability

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Proceedings Article | 5 June 2010 Paper

Long lifetime of single atom in optical tweezer with laser cooling

Junmin Wang, Jun He, Baodong Yang, Tiancai Zhang, Kunchi Peng

Proceedings Volume 7727, 77270U (2010) https://doi.org/10.1117/12.856340

KEYWORDS: Chemical species, Optical tweezers, Photon counting, Laser optics, Magnetism, Cesium, Solids, Luminescence, Glasses, Quantum optics

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Showing 5 of 11 publications

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