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Optical free induction decay emission carrying orbit angular momentum from ionic nitrogen enabled by multiple-photon resonance

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Chinese Optics Letters 2024年第6期22卷 177-181页

作者： Kailu Wang Haicheng Mei Jingsong Gao Liang Xu Hongbing Jiang Yi Liu Shanghai Key Laboratory of Modern Optical System University of Shanghai for Science and TechnologyShanghai 200093China State Key Laboratory for Mesoscopic Physics School of PhysicsPeking UniversityBeijing 100871China cas center for excellence in ultra-intense laser science Shanghai 201800China

Coherent optical emission of free induction decay (FID) excited by the multiple-photon resonance has been recently observed in nitrogen ions produced by intense femtosecond laser *** we report that orbit angular momentum (OAM) of the pump laser pulses can be transferred to the much longer pulsed free induction decay emission with the OAM *** was found that when the pump laser frequency approaches the fraction of the 391.4 nm emission (ν_(0)/5),an FID emission is emitted whereas its topological charge was identified to be 5 times of the pump *** to the reduced laser intensity with a vortex pump compared to the conventional Gaussian beam,the resonant pump laser wavelength presents a redshift,and the FID signal is significantly weaker.

关键词： air lasing orbital angular momentum free induction decay femtosecond pulses photoionization

Bunching enhancement for coherent harmonic generation by using phase merging effects

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Matter and Radiation at Extremes 2024年第5期9卷 10-21页

作者： Ke Feng Kangnan Jiang Runshu Hu Shixia Luan Wentao Wang Ruxin Li State Key Laboratory of High Field laser Physics and cas center for excellence in ultra-intense laser science Shanghai Institute of Optics and Fine Mechanics(SIOM)Chinese Academy of Sciences(CAS)ShanghaiPeople’s Republic of China School of Physical science and Technology ShanghaiTech UniversityShanghaiPeople’s Republic of China center of Materials science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijingPeople’s Republic of China

In this paper,promising but simple schemes are investigated to enhance the micro-bunching of relativistic electron beams for coherent harmonic generation(CHG)by using phase merging *** contrast to the standard CHG scheme,two specially designed dispersion sections(DSs)are adopted with the DS-modulator–DS *** phase space of the e beam is appropriately coupled in the first DS,and the electrons within one seed wavelength can merge to the same phase with a matched second ***-bunching of the e beam can thus be enhanced by a large margin with much higher-harmonic *** e beams from laser wakefield accelerators(LWFAs)as an example,start-to-end simulations are performed to show the effectiveness and robustness of the proposed schemes with several *** beam current can be optimized to several tens to hundreds of kiloamperes,and the radiation power reaches hundreds of megawatts in the extreme ultraviolet regime within a 3.5 m-long *** proposed schemes offer new opportunities for future compact free-electron lasers driven by LWFAs and provides prospects for truly compact and widely applicable systems.

关键词： modulator harmonic phase

Stable,intense supercontinuum light generation at 1 kHz by electric field assisted femtosecond laser filamentation in air

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Light(science & Applications) 2024年第2期13卷 354-365页

作者： Yaoxiang Liu Fukang Yin Tie-Jun Wang Yuxin Leng Ruxin Li Zhizhan Xu See Leang Chin State Key Laboratory of High Field laser Physics Shanghai Institute of Optics and Fine Mechanics and CAS Center for Excellence in Ultra-intense Laser ScienceChinese Academy of SciencesShanghaiChina center of Materials science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijingChina Centre d’Optique Photonique et Laser(COPL)and Département de physiquede génie physique et d’optiqueUniversitéLavalQuébecQuébecCanada

Supercontinuum(SC)light source has advanced ultrafast laser spectroscopy in condensed matter science,biology,physics,and *** to the frequently used photonic crystal fibers and bulk materials,femtosecond laser filamentation in gases is damage-immune for supercontinuum generation.A bottleneck problem is the strong jitters from filament induced self-heating at kHz repetition rate *** demonstrated stable kHz supercontinuum generation directly in air with multiple mJ level pulse *** was achieved by applying an external DC electric field to the air plasma *** pointing jitters of the 1 kHz air filament induced SC light were reduced by more than 2 *** stabilized high repetition rate laser filament offers the opportunity for stable intense SC generation and its applications in air.

关键词： intense repetition light

Strong field ionization of molecules on the surface of nanosystems

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Chinese Physics B 2024年第4期33卷 25-34页

作者：曲棋文孙烽豪王佳伟高健李辉吴健 State Key Laboratory of Precision Spectroscopy East China Normal UniversityShanghai 200241China Chongqing Key Laboratory of Precision Optics Chongqing Institute of East China Normal UniversityChongqing 401121China Collaborative Innovation center of Extreme Optics Shanxi UniversityTaiyuan 030006China cas center for excellence in ultra-intense laser science Shanghai 201800China

Besides the diverse investigations on the interactions between intense laser fields and molecular systems,extensive research has been recently dedicated to exploring the response of nanosystems excited by well-tailored femtosecond laser *** to the fact that nanostructures hold peculiar effects when illuminated by laser pulses,the underlying mechanisms and the corresponding potential applications can make significant improvements in both fundamental research and development of novel *** this review,we provide a summarization of the strong field ionization occurring on the surface of *** molecules attached to the nanoparticle surface perform as the precursor in the ionization and excitation of the whole nanosystem,the fundamental processes of which are yet to be *** discuss the influence on nanoparticle constituents,geometric shapes and sizes,as well as the specific waveforms of the excitation laser *** intriguing characteristics observed in surface ion emission reflect how enhanced near field affects the localized ionizations and nanoplasma expansions,thereby paving the way for further precision controls on the light-and-matter interactions in the extreme spatial temporal levels.

关键词： nanoparticle femtosecond laser field local field enhancement

Pulse repetition rate effect on the plasma inside femtosecond laser filament in air

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Chinese Optics Letters 2024年第1期22卷 135-140页

作者：尹富康王铁军刘尧香龙娟魏迎霞朱斌周凯南冷雨欣 State Key Laboratory of High Field laser Physics Shanghai Institute of Optics and Fine Mechanics and CAS Center for Excellence in Ultra-intense Laser ScienceChinese Academy of SciencesShanghai 201800China center of Materials science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China laser Fusion Research center and science&Technology on Plasma Physics Laboratory China Academy of Engineering PhysicsMianyang 621999China

The characteristics of plasmas play an important role in femtosecond laser filament-based *** analysis is used to experimentally investigate the plasma density and its temperature of the air filament under different pulse repetition *** our experiments,the measured average plasma density of the filament is 1.54×10^(17)cm^(-3)and the temperature of the plasma is about 5100 K under 100 Hz pulse repetition *** plasma density decreases to1.43×10^(17)cm^(-3)and the temperature increases to 6230 K as the pulse repetition rate increases to 1000 *** experimental observation agrees with the numerical simulation by solving the nonlinear Schr?dinger equations with repetition rate related“low density hole”correction.

关键词： femtosecond laser filamentation cumulative effects electron density

Microscopic nonlinear optical activities and ultrafast carrier dynamics in layered AgInP_(2)S_(6)

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Photonics Research 2024年第4期12卷 691-700页

作者： ZIXIN WANG NINGNING DONG YU MAO CHENDUAN CHEN XIN CHEN CHANG XU ZHOUYUAN YAN JUN WANG Aerospace laser Technology and Systems Department CAS Key Laboratory of Materials for High-Power LaserShanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China center of Materials science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China cas center for excellence in ultra-intense laser science(CEULS) State Key Laboratory of High Field Laser PhysicsShanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China

Since the emergence of graphene, transition metal dichalcogenides, and black phosphorus, two-dimensional materials have attracted significant attention and have driven the development of fundamental physics and optoelectronic devices. Metal phosphorus trichalcogenides(MPX3), due to their large bandgap of 1.3–3.5 eV, enable the extension of optoelectronic applications to visible and ultraviolet(UV) wavelengths.

关键词： nonlinear ultraviolet phosphorus

Generation of visible Raman operation laser by a fiber electro-optical modulator feedback loop

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Chinese Optics Letters 2024年第2期22卷 180-185页

作者：李睿睿叶蔚然陈一龙陈树谦亓文昊崔金明黄运锋李传锋郭光灿 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 Hefei National Laboratory University of Science and Technology of ChinaHefei 230088China

Phase-coherent multi-tone lasers play a critical role in atomic,molecular,and optical *** them,the Raman opeartion laser for manipulating atomic hyperfine qubits requires gigahertz bandwidth and low phase noise to retain long-term *** operation lasers generated by directly modulated and frequency-multipled infrared lasers are compact and stable but lack feedback control to actively suppress the phase noise,which limits their performance in practical *** this work,we employ a fiber electro-optical modulator driven by a voltage-controlled oscillator(VCO)to modulate a monochromatic laser and employ a second-harmonic generation process to convert it to the visible domain,where the beat note of the Raman operation laser is stabilized by controlling the output frequency of VCO with a digital phase-locked loop(PLL).The low-frequency phase noise is effectively suppressed compared to the scheme without active feedback and it reaches-80 d Bc/Hz@5 k Hz with a 20 k Hz loop ***,this compact and robust scheme effectively reduces the system's complexity and cost,which is promising for extensive application in atomic,molecular,and optical physics.

关键词： phase-coherent laser quantum information trapped ion stimulated Raman transition phase-locked loop

Vector magnetometry in zero bias magnetic field using nitrogen-vacancy ensembles

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Chinese Physics B 2024年第10期33卷 21-29页

作者： Chunxing Li Fa-Zhan Shi Jingwei Zhou Peng-Fei Wang cas Key Laboratory of Microscale Magnetic Resonance and School of Physical sciences 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 Hefei National Laboratory University of Science and Technology of ChinaHefei 230088China

The application of the vector magnetometry based on nitrogen-vacancy(NV)ensembles has been widely investigatedin multiple *** has the superiority of high sensitivity and high stability in ambient conditions with microscale ***,a bias magnetic field is necessary to fully separate the resonance lines of optically detected magneticresonance(ODMR)spectrum of NV *** brings disturbances in samples being detected and limits the rangeof ***,we demonstrate a method of vector magnetometry in zero bias magnetic field using NV *** utilizing the anisotropy property of fluorescence excited from NV centers,we analyzed the ODMR spectrum of NVensembles under various polarized angles of excitation laser in zero bias magnetic field with a quantitative numerical modeland reconstructed the magnetic field *** minimum magnetic field modulus that can be resolved accurately is downto~0.64 G theoretically depending on the ODMR spectral line width(1.8 MHz),and~2 G experimentally due to noisesin fluorescence signals and errors in *** using 13C purified and low nitrogen concentration diamond combinedwith improving calibration of unknown parameters,the ODMR spectral line width can be further decreased below 0.5 MHz,corresponding to~0.18 G minimum resolvable magnetic field modulus.

关键词： vector magnetometry NV ensembles optically detected magnetic resonance(ODMR) zero bias magnetic field

Soliton microcomb generation by cavity polygon modes

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Opto-Electronic Advances 2024年第8期7卷 6-14页

作者： Botao Fu Renhong Gao Ni Yao Haisu Zhang Chuntao Li Jintian Lin Min Wang Lingling Qiao Ya Cheng State Key Laboratory of High Field laser Physics and cas center for excellence in ultra-intense laser science Shanghai Institute of Optics and Fine Mechanics(SIOM)Chinese Academy of Sciences(CAS)Shanghai 201800China Research center for Frontier Fundamental Studies Zhejiang LabHangzhou 311100China Engineering Research center for Nanophotonics&Advanced Instrument Ministry of EducationSchool of Physics and Electronic ScienceEast China Normal UniversityShanghai 200241China School of Physical science and Technology ShanghaiTech UniversityShanghai 200031China center of Materials science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Shanghai Research center for Quantum sciences Shanghai 201315China Hefei National Laboratory Hefei 230088China

Soliton microcombs,which require the hosting cavity to operate in an anomalous dispersion regime,are essential to integrate photonic *** the past,soliton microcombs were generated on cavity whispering gallery modes(WGMs),and the anomalous dispersion requirement of the cavity made by normal dispersion material was achieved through structural dispersion *** inevitably degrades the cavity optical quality factor(Q)and increases pump threshold power for soliton comb *** overcome the challenges,here,we report a soliton microcomb excited by cavity polygon *** modes display anomalous dispersion at near-infrared while optical Q factors exceeding 4×10^(6) are ***,a soliton comb spanning from 1450 nm to 1620 nm with a record low pump power of 11 m W is demonstrated,a three-fold improvement compared to the state of the art on the same material platform.

关键词： thin-film lithium niobate nonlinear optics microresonators