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Scheme for implementing frequency up-conversion between two collective atomic modes

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Chinese Physics B 2009年第9期18卷 3890-3892页

作者：林丽华 Department of Electronic Science and Applied Physics Fuzhou University

This paper presents a scheme for realizing the frequency up-conversion between two collective atomic modes. In the scheme two atomic samples are coupled to a cavity mode. Under the large detuning condition, the two collective atomic modes are coupled via the virtual excitation of the cavity mode and the effective Hamiltonian corresponds to the frequency up-conversion. In the scheme the cavity mode is only virtually excited and thus the process is insensitive to cavity decay.

关键词： frequency up-conversion collective atomic mode virtual excitation

Lasing frequency up-conversion by Using Thermal Population

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Journal of Shanghai Jiaotong university(Science) 2019年第5期24卷 579-583页

作者： NKONDE Sampa JIANG Chun State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic EngineeringShanghai Jiao Tong University

We theoretically demonstrate a model which can be used to analyze frequency up-conversion of a laser wavelength by using thermal population. The proposed model uses a rate equation model of ytterbium-doped fiber with thermal population effect. The rate and power propagation equations are set up and numerically analyzed to elucidate the dependence of frequency up-conversion efficiency and thermal-optical conversion efficiency on ambient thermal power. The analytical techniques and numerical results show that using pump laser at 1 000 nm,the wavelength can be converted into 900 nm with an up-conversion quantum efficiency of about 99.97% and a cooling efficiency of about 11.1%. This theoretical model is a promising candidate for vast applications in energyefficient laser and energy-utilizing field.

关键词： fiber laser frequency up-conversion thermal population lasing

up-conversion detection of mid-infrared light carrying orbital angular momentum

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Chinese Physics B 2022年第10期31卷 131-136页

作者： Zheng Ge Chen Yang Yin-Hai Li Yan Li Shi-Kai Liu Su-Jian Niu Zhi-Yuan Zhou Bao-Sen Shi CAS Key Laboratory of Quantum Information University of Science and Technology of ChinaHefei 230026China CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China

frequency up-conversion is an effective method of mid-infrared(MIR) detection by converting long-wavelength photons to the visible domain, where efficient detectors are readily available. Here, we generate MIR light carrying orbital angular momentum(OAM) from a difference frequency generation process and perform up-conversion on it via sum frequency conversion in a bulk quasi-phase-matching crystal. The maximum quantum conversion efficiencies from MIR to visible are 34.0%, 10.4%, and 3.5% for light with topological charges of 0, 1, and 2, respectively, achieved by utilizing an optimized strong pump light. We also verify the OAM conservation with a specially designed interferometer, and the results agree well with the numerical simulations. Our study opens up the possibilities for generating, manipulating, and detecting MIR light that carries OAM, and will have great potential for optical communications and remote sensing in the MIR regime.

关键词： nonlinear optics frequency up-conversion mid-infrared detection

Single-photon detection and its applications

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Science China(Physics,Mechanics & Astronomy) 2014年第7期57卷 1218-1232页

作者： LIANG Yan ZENG HePing Shanghai Key Laboratory of Modern Optical System Engineering Research Center of Optical Instrument and System Ministry of Education School of Optical-Electrical and Computer Engineering University of Shanghai for Science and Technology State Key Laboratory of Precision Spectroscopy East China Normal University

A single-photon detector is an extremely sensitive device capable of registering photons,offering essential technical support for optics quantum information *** review herein our recent experimental progress in the development and application of single-photon detection *** based on advanced self-differencing,low-pass filtering,frequency up-conversion and photon-number-resolving are introduced for attaining high-speed,high-efficiency,low-noise single-photon detection at infrared *** advantages of high-speed single-photon detection are discussed in some applications,such as the laser ranging and quantum key *** photon-number-resolving detection is shown to support efficient quantum random number generation.

关键词： quantum optics photodetection avalanche photodiode frequency up-conversion

An ultra-low-frequency, broadband, multi-stable,frequency up converted and piezoelectricelectromagnetic-triboelectric hybrid energy harvester for powering portable electronics

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An ultra-low-frequency, broadband, multi-stable,frequency up...