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Experimental study on the Stokes effect in disordered birefringent microstructure fibers

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Chinese Physics B 2014年第8期23卷 368-373页

作者：赵原源周桂耀李建设张志远韩颖 College of Information Science and Engineering Yanshan University College of Science Yanshan University Key Laboratory of Metastable Material Science and Technology Yanshan University College of Science Air Force Engineering University

In this paper, a 120-fs pulse transmission experiment is carried out using disordered birefringent microstructure fibers with cladding ventages. Through this experiment, it is found for the first time that remarkable Stokes and anti-Stokes waves can also be produced when the central wavelength of the incident pulse is in the normal dispersion regime of the microstructure fiber. The generation of the two waves can be explained by the four-wave mixing phase matching theory. Properties of the two waves under the action of femtosecond laser pulses with different parameters are studied. The results show that the central wavelength of anti-Stokes waves and Stokes waves produced under the two orthogonal polarization states shift by 63 nm and 160 nm, respectively. The strengths and central positions of the two waves in birefringent fibers can be controlled by adjusting the phase match condition and the polarization directions of incident pulses.

关键词： microstructure fiber four-wave mixing anti-Stokes wave Stokes wave

Phase dispersion of Raman and Rayleigh-enhanced four-wave mixings in femtosecond polarization beats

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Chinese Physics B 2009年第6期18卷 2340-2351页

作者：赵燕聂志强李昌彪张彦鹏甘琛利郑淮斌李院院卢克清 Key Laboratory for Physical Electronics and Devices of the Ministry of Education Xi’an Jiaotong University State Key Laboratory of Transient Optics and Technology Xi’an Institute of Optics and Precision MechanicsChinese Academy of Sciences

Based on color-locking noisy field correlation in three Markovian stochastic models, phase dispersions of the Raman- and Rayleigh-enhanced four-wave mixing （FWM） have been investigated. The phase dispersions are modified by both linewidth and time delay for negative time delay, but only by linewidth for positive time delay. Moreover, the results under narrowband condition are close to the nonmodified nonlinear dispersion and absorption of the material. Homodyne and heterodyne detections of the Raman, the Rayleigh and the mixing femtosecond difference-frequency polarization beats have also been investigated, separately.

关键词： phase dispersion Raman Rayleigh four-wave mixing

A two-mode squeezed light based on a double-pump phase-matching geometry

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Chinese Physics B 2020年第7期29卷 337-345页

作者：何烜坚贾俊高锋陈丽清袁春华张卫平 State Key Laboratory of Precision Spectroscopy Quantum Institute for Light and AtomsDepartment of PhysicsEast China Normal UniversityShanghai 200062 School of Physics and Astronomy and Tsung-Dao Lee InstituteShanghai Jiao Tong UniversityShanghai 200240China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

We theoretically investigate the frequency-nondegenerate and frequency degenerate squeezed lights with a four-wave mixing process(4WM)driven by two pump fields crossing at a small angle.Different from a 4WM process driven by a single pump field,the refractive index of the corresponding probe field,np,can be converted to a value that is greater than 1 or less than 1 by an angle adjustment.In the new region with np<1,the bandwidth of the gain is relatively large due to the slow change in the refractive index with the two-photon detuning.In this region with an exchange of the roles of the pump and probe beams,the frequency degenerate and spatial nondegenerate twin beams can be generated,which has potential application in quantum information and quantum metrology.

关键词： four-wave mixing phase matching frequency degenerate and spatial nondegenerate metrology

Tunable microwave signal generation based on an Opto-DMD processor and a photonic crystal fiber

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Chinese Physics B 2014年第6期23卷 304-310页

作者：王涛桑新柱颜玢玢艾琪李妍陈笑张颖陈根祥宋菲君张霞王葵如苑金辉余重秀肖峰 Alameh Kamal State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications College of Science Minzu University of China WA Center of Excellence for MicroPhotonic System Electron Science Research Institute Edith Cowan University

Frequency-tunable microwave signal generation is proposed and experimentally demonstrated with a dual-wavelength single-longitudinal-mode （SLM） erbium-doped fiber ring laser based on a digital Opto-DMD processor and four-wave mixing （FWM） in a high-nonlinear photonic crystal fiber （PCF）. The high-nonlinear PCF is employed for the generation of the FWM to obtain stable and uniform dual-wavelength oscillation. Two different short passive sub-ring cavities in the main ring cavity serve as mode filters to make SLM lasing. The two lasing wavelengths are electronically selected by loading different gratings on the Opto-DMD processor controlled with a computer. The wavelength spacing can be smartly adjusted from 0.165 nm to 1.08 nm within a tuning accuracy of 0.055 nm. Two microwave signals at 17.23 GHz and 27.47 GHz are achieved. The stability of the microwave signal is discussed. The system has the ability to generate a 137.36-GHz photonic millimeter signal at room temperature.

关键词： fiber lasers four-wave mixing Opto-DMD processor tunable microwave signal

Far-field super-resolution imaging by nonlinearly excited evanescent waves

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Advanced Photonics 2021年第2期3卷 61-67页

作者： Zhihao Zhou Wei Liu Jiajing He Lei Chen Xin Luo Dongyi Shen Jianjun Cao Yaping Dan Xianfeng Chen Wenjie Wan Shanghai Jiao Tong University University of Michigan-Shanghai Jiao Tong University Joint InstituteState Key Laboratory of Advanced Optical Communication Systems and NetworksShanghaiChina Shanghai Jiao Tong University School of Physics and AstronomyMOE Key Laboratory for Laser Plasmas and Collaborative Innovation Center of IFSAShanghaiChina Jiangnan University School of ScienceWuxiChina

Abbe’s resolution limit,one of the best-known physical limitations,poses a great challenge for any wave system in imaging,wave transport,and dynamics.Originally formulated in linear optics,the Abbe limit can be broken using nonlinear optical interactions.We extend the Abbe theory into a nonlinear regime and experimentally demonstrate a far-field,label-free,and scan-free super-resolution imaging technique based on nonlinear four-wave mixing to retrieve near-field scattered evanescent waves,achieving a sub-wavelength resolution ofλ∕5.6.This method paves the way for numerous new applications in biomedical imaging,semiconductor metrology,and photolithography.

关键词： nonlinear optics four-wave mixing evanescent wave super-resolution fourier ptychography

Einstein-Podolsky-Rosen entanglement in bad cavity case

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Chinese Physics B 2010年第7期19卷 297-301页

作者：袁绥洪胡响明 Department of Physics Huazhong Normal University

This paper explores continuous variable entanglement in four-wave mixing when the atomic relaxation time is comparable to and longer than the cavity relaxation time. In this case the atomic memory is included in the field correlations and the entanglement in the output fields can be significantly enhanced. Einstein Podolsky Rosen （EPR） entanglement is achievable even in the bad cavity limit. This shows the EPR entanglement generation without need of good cavity.

关键词： atomic memory effect EPR entanglement four-wave mixing

Directional coherent light via intensity-induced sideband emission

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Light(Science & Applications) 2016年第1期5卷 33-38页

作者： Andrew J Traverso Chris O’Brien Brett H Hokr Jonathan V Thompson Luqi Yuan Charles W Ballmann Anatoly A Svidzinsky Georgi I Petrov Marlan O Scully Vladislav V Yakovlev Texas A&M University College StationTX 77843USA Princeton University PrincetonNJ 08544USA Baylor University WacoTX 76798USA

We introduce a unique technique for generating directional coherent emissions that could be utilized to create coherent sources in a wide range of frequencies from the extreme ultraviolet(XUV)to the deep infrared.This is accomplished without population inversion by pumping a two-level system with a far-detuned strong optical field that induces the splitting of the two-level system.A nonlinear process of four-wave mixing then occurs across the split system,driving coherent emission at sidebands both redand blue-detuned from the pump frequency,and propagates both forward and backward along the pump beam path.We observed this phenomenon in dense rubidium vapor along both the D_(1) and D_(2) transitions.The sideband emission exhibits a short pulse duration(o1 ns)with threshold-like behavior dependent on both the pump intensity and Rb vapor density.This technique offers a new capability for manipulating the emission frequency simply through intensity-induced atomic modulation that can be scaled to most frequency regimes using various atomic/molecular ensembles and pump energies.

关键词： coherent emission collective coherence four-wave mixing

Theoretical study on phase conjugation in weakly injected vertical-cavity surface-emitting lasers

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Chinese Physics B 2008年第5期17卷 1821-1825页

作者：张伟利潘炜罗斌李孝峰邹喜华王梦遥 School of Information Science & Technology Southwest Jiaotong University

This paper gives a detailed theoretical investigation on phase conjugation induced by nearly degenerate fourwave mixing in single mode vertical-cavity surface-emitting lasers （VCSELs） with weak optical injection. Considering VCSELs that can work in linearly polarized or elliptically polarized states, it derives the theoretical expression of the conjugated field by small signal analysis based on the vectoral rate equations-the spin-flip model. For linearly polarized state, VCSELs show similar conjugate spectra to edge-emitting semiconductor lasers. For the elliptically polarized state, dichroism and birefringence parameters as well as the spin-flip rate can change the conjugate spectra. Especially, when frequency detuning of the probe and pump waves is between the positive and negative relaxation oscillation frequency, changes are evident. For specific values of parameters, conjugate efficiency between 20 dB to 40 dB are obtained.

关键词： phase conjugate VCSELs polarization four-wave mixing

Advances in soliton microcomb generation

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Advanced Photonics 2020年第3期2卷 2-28页

作者： Weiqiang Wang Leiran Wang Wenfu Zhang Chinese Academy of Sciences Xi’an Institute of Optics and Precision MechanicsState Key Laboratory of Transient Optics and PhotonicsXi’anChina University of Chinese Academy of Sciences BeijingChina

Optical frequency combs,a revolutionary light source characterized by discrete and equally spaced frequencies,are usually regarded as a cornerstone for advanced frequency metrology,precision spectroscopy,high-speed communication,distance ranging,molecule detection,and many others.Due to the rapid development of micro/nanofabrication technology,breakthroughs in the quality factor of microresonators enable ultrahigh energy buildup inside cavities,which gives birth to microcavity-based frequency combs.In particular,the full coherent spectrum of the soliton microcomb(SMC)provides a route to low-noise ultrashort pulses with a repetition rate over two orders of magnitude higher than that of traditional mode-locking approaches.This enables lower power consumption and cost for a wide range of applications.This review summarizes recent achievements in SMCs,including the basic theory and physical model,as well as experimental techniques for single-soliton generation and various extraordinary soliton states(soliton crystals,Stokes solitons,breathers,molecules,cavity solitons,and dark solitons),with a perspective on their potential applications and remaining challenges.

关键词： optical frequency comb soliton microcomb microcavity photonic integration Kerr effect four-wave mixing