Prof. Junmin Wang Profile

Prof. Junmin Wang

Professor at Shanxi Univ

Area of Expertise:

Laser freqency conversion (SHG, SFG, OPO, and ect.) , Laser spectroscopy , Qantum Optics (squeezing, single atoms, single photons, and etc.)

Publications (21)

PROCEEDINGS ARTICLE | May 23, 2018

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

Proc. SPIE. 10684, Nonlinear Optics and its Applications 2018

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

Read Abstract

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 | August 3, 2016

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

Proc. SPIE. 9900, Quantum Optics

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

Read Abstract

PROCEEDINGS ARTICLE | May 1, 2014

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

Proc. SPIE. 9136, Nonlinear Optics and Its Applications VIII; and Quantum Optics III

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

Read Abstract

PROCEEDINGS ARTICLE | May 8, 2013

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

Proc. SPIE. 8772, Nonlinear Optics and Applications VII

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

Read Abstract

PROCEEDINGS ARTICLE | May 6, 2013

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

Proc. SPIE. 8773, Photon Counting Applications IV; and Quantum Optics and Quantum Information Transfer and Processing

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

Read Abstract

PROCEEDINGS ARTICLE | November 29, 2012

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

Proc. SPIE. 8554, Quantum and Nonlinear Optics II

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

Read Abstract

PROCEEDINGS ARTICLE | November 29, 2012

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

Proc. SPIE. 8554, Quantum and Nonlinear Optics II

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

Read Abstract

This work deals with the cooling and trapping of single cesium (Cs) atoms in a large-magnetic-gradient magneto-optical trap (MOT) and the confinement of single Cs atoms in a far-off-resonance optical dipole trap (FORT). The experiment setup is based on two large-numerical-aperture lens assemblies which allow us to strongly focus a 1064-nm TEM₀₀-mode Gaussian laser beam to a 1/e² radius of ~ 2.3 μm to form a microscopic FORT for isolating single atom with environment and to efficiently collect the laser-induced-fluorescence photons emitted by single atoms for detecting and recognizing single atom’s internal state. We have tried both of “bottom-up” and “top-down” loading schemes to confine single atoms in the microscopic FORT. In the “bottom-up” scheme, we have successfully prepared single Cs atoms in the MOT and transferred it into FORT with a probability of almost 100%. In the “top-down” scheme, we have achieved ~ 74% of single atom loading probability in the FORT using light-assisted collisions induced by blue detuning laser and with prepared many Cs atoms in the MOT. The relaxation time in hyperfine level of ground state of trapped single Cs atom is measured to be ~5.4 s. To coherently manipulate atomic quantum bits (qubit) encoded in the clock states (m_F = 0 states in F_g= 3 and 4 hyperfine levels) of single Cs atom via the two-photon simulated Raman adiabatic passage (STIRAP), we have prepared two phase-locked laser beams with a frequency difference of ~ 9.192 GHz by optically injecting an 852-nm master laser to lock the +1-order sideband of a 9-GHz current-modulated slave diode laser. The two phase-locked laser beams are used to drive STIRAP process in the Λ-type three-level system consists of Cs |6S_1/2 F_g = 4, m_F = 0> and |6S_1/2 F_g = 3, m_F= 0< long-lived clock states and Cs |6S_1/2 F_e = 4, m_F = +1 > excited state with the single-photon detuning of ~ -20 GHz. Rabi flopping experiments are in progress.

PROCEEDINGS ARTICLE | November 29, 2012

Optimization of the experimental parameters of cesium CPT system

Proc. SPIE. 8554, Quantum and Nonlinear Optics II

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

Read Abstract

PROCEEDINGS ARTICLE | May 4, 2012

Magic-wavelength optical dipole trap of cesium and rubidium atoms

Proc. SPIE. 8440, Quantum Optics II

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

Read Abstract

PROCEEDINGS ARTICLE | May 4, 2012

Realization and application of strong coupling of single cesium atoms with TEM00 and TEM10 modes of a high-finesse Fabry-Perot cavity

Proc. SPIE. 8440, Quantum Optics II

KEYWORDS: Fabry–Perot interferometers, Avalanche photodetectors, Sensors, Chemical species, Solids, Spatial resolution, Quantum optics, Laser beam diagnostics, Cesium, Temperature metrology

Read Abstract

PROCEEDINGS ARTICLE | May 6, 2011

SROP and DROP spectra with alkali atomic vapor cell and applications

Proc. SPIE. 8072, Photon Counting Applications, Quantum Optics, and Quantum Information Transfer and Processing III

KEYWORDS: Signal to noise ratio, Doppler effect, Chemical species, Spectroscopy, Laser applications, Laser stabilization, Quantum optics, Optical pumping, Laser beam diagnostics, Cesium

Read Abstract

PROCEEDINGS ARTICLE | November 5, 2010

Characterizing double-resonance optical-pumping spectra of cesium 6P3/2 - 8S1/2 excited-state transition and its application

Proc. SPIE. 7846, Quantum and Nonlinear Optics

KEYWORDS: Signal to noise ratio, Modulation, Doppler effect, Chemical species, Semiconductor lasers, Laser stabilization, Optical pumping, Laser beam diagnostics, Cesium, Absorption

Read Abstract

PROCEEDINGS ARTICLE | November 5, 2010

Frequency doubling of 1560nm diode laser via PPLN and PPKTP crystals and frequency stabilization to rubidium absorption line

Proc. SPIE. 7846, Quantum and Nonlinear Optics

KEYWORDS: Second-harmonic generation, Optical amplifiers, Chemical species, Crystals, Semiconductor lasers, Laser stabilization, Laser crystals, Nonlinear crystals, Rubidium, Absorption

Read Abstract

PROCEEDINGS ARTICLE | November 5, 2010

Double-resonance optical-pumping spectra of rubidium 5S1/2 - 5P3/2 - 4D3/2 transitions and frequency stabilization of 1.5-micrometer laser

Proc. SPIE. 7846, Quantum and Nonlinear Optics

KEYWORDS: Signal to noise ratio, Modulation, Chemical species, Spectroscopy, Semiconductor lasers, Laser stabilization, Optical pumping, Laser beam diagnostics, Signal detection, Rubidium

Read Abstract

PROCEEDINGS ARTICLE | June 5, 2010

Long lifetime of single atom in optical tweezer with laser cooling

Proc. SPIE. 7727, Quantum Optics

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

Read Abstract

PROCEEDINGS ARTICLE | December 24, 2005

Two schemes of modulation-free frequency stabilization of grating-external-cavity diode laser via cesium sub-Doppler spectra

Proc. SPIE. 6028, ICO20: Lasers and Laser Technologies

KEYWORDS: Beam splitters, Modulation, Doppler effect, Magnetism, Semiconductor lasers, Laser stabilization, Bragg cells, Laser beam diagnostics, Cesium, Absorption

Read Abstract

PROCEEDINGS ARTICLE | January 11, 2005

Correction of photon statistics of quantum states in single photon detection

Proc. SPIE. 5631, Quantum Optics and Applications in Computing and Communications II

KEYWORDS: Photodetectors, Beam splitters, Statistical analysis, Sensors, Quantum efficiency, Single photon, Solids, Quantum optics, Quantum information, Quantum information processing

Read Abstract

PROCEEDINGS ARTICLE | September 5, 2002

Frequency stabilization of DBR laser diode to cesium D2 line by the third-order deviation locking without dither

Proc. SPIE. 4913, Semiconductor Lasers and Applications

KEYWORDS: Optical amplifiers, Modulation, Doppler effect, Modulators, Semiconductor lasers, Laser stabilization, Quantum optics, Bragg cells, Cesium, Absorption

Read Abstract

PROCEEDINGS ARTICLE | September 5, 2002

External-cavity frequency doubler from 858 to 429 nm using KNbO3 crystal

Proc. SPIE. 4914, High-Power Lasers and Applications II

KEYWORDS: Mirrors, Second-harmonic generation, Continuous wave operation, Crystals, Semiconductor lasers, Thermal effects, Sapphire lasers, Laser crystals, Nonlinear crystals, Absorption

Read Abstract

PROCEEDINGS ARTICLE | December 31, 1996

MBG holograms under the optimum conditions

Proc. SPIE. 2866, International Conference on Holography and Optical Information Processing (ICHOIP '96)

KEYWORDS: Diffraction, Refractive index, Holograms, Holography, Curium, Molecules, X-rays, Calcium, Humidity, Diffraction gratings

Read Abstract

PROCEEDINGS ARTICLE | October 28, 1992

High efficient CW Nd:MgO:LiNbO3 self-frequency doubling laser

Proc. SPIE. 1726, 1992 Shanghai International Symposium on Quantum Optics

KEYWORDS: Mirrors, Continuous wave operation, Resonators, Polarization, Dye lasers, Crystals, Argon ion lasers, Laser resonators, Laser crystals, Neodymium

Read Abstract

Showing 5 of 21 publications

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Keywords/Phrases

Search In:

Publication Years