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Nonlinear Energy Cascading in Turbulence during the Internal Reconnection Event at the Sino-United Spherical Tokamak
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作者 柴忪 许宇鸿 +3 位作者 高喆 王文浩 刘阳青 谭熠 《Chinese Physics Letters》 SCIE CAS CSCD 2017年第2期56-59,共4页
The characteristics of the energy transfer and nonlinear coupling among edge electromagnetic turbulence in thermal quench sub-period of the internal reconnection event (IRE) are studied at the sino-united spherical ... The characteristics of the energy transfer and nonlinear coupling among edge electromagnetic turbulence in thermal quench sub-period of the internal reconnection event (IRE) are studied at the sino-united spherical tokamak device using multiple Langmuir and magnetic probe arrays. The wavelet bispectral analysis and the modified Kim method are applied to investigate linear growth/damping and nonlinear energy transfer rates, along with multi-field turbulence interactions. The results show a multi-field nonlinear energy transfer from electrostatic to magnetic turbulence that results in two-mode coupling in magnetic turbulence, which may play a crucial role to trigger the IRE. 展开更多
关键词 nonlinear Energy Cascading in Turbulence during the Internal Reconnection Event at the Sino-United Spherical Tokamak kHz
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The Tolerance of All-Optical Switching Based on Cascaded Second-Order Nonlinearity in PPLN APE Waveguide 被引量:1
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作者 Ting Xue, Jian Yu, Mei Sang, ShiChen LiCollege of Precision Instrument and Optoelectronics Engineering, Tianjin University (300072) P.R.China Laboratory of Optoelectronics Information Technical Science, EMC. 《光学学报》 EI CAS CSCD 北大核心 2003年第S1期311-312,共2页
Based on solving the couple mode equation numerically, the characterization of the signal power on the gate power was analyzed. And the relationship of the tolerance of the grating period and the bulk temperature on t... Based on solving the couple mode equation numerically, the characterization of the signal power on the gate power was analyzed. And the relationship of the tolerance of the grating period and the bulk temperature on the interaction length was analyzed. 展开更多
关键词 PPLN WAVE The Tolerance of All-Optical Switching Based on cascaded Second-Order nonlinearity in PPLN APE Waveguide on of APE in
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Single-to-Multiple Channel Wavelength Conversions and Tuning of Picosecond Pulses in Quasi-Phase-Matched Waveguides 被引量:1
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作者 王健 孙军强 +3 位作者 罗传红 孙琪真 张新亮 黄德修 《Chinese Physics Letters》 SCIE CAS CSCD 2006年第7期1806-1809,共4页
We report the single-to-multiple channel wavelength conversions of 1.57-ps pulses based on cascaded secondharmonic generation and difference frequency generation in quasi-phase-matched periodically poled lithium hieba... We report the single-to-multiple channel wavelength conversions of 1.57-ps pulses based on cascaded secondharmonic generation and difference frequency generation in quasi-phase-matched periodically poled lithium hiebate waveguides. For single-to-single channel wavelength conversion, no external cavity laser is required with use of a fibre ring laser. The conversion efficiency is about -21.44 dB. The converted idler wavelength can be tuned from 1526.4nm to 1537.5nm as the lasing pump wavelength is varied from 1566.1 nm to 1555.0nm. By employing several input pumps, tunable single-to-dual and single-to-triple channel wavelength conversions are experimentally demonstrated. 展开更多
关键词 cascadeD 2ND-ORDER nonlinearITY DIFFERENCE-FREQUENCY-GENERATION LITHIUM-NIOBATE
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Evolution of Dark Spatial Soliton in Quasi-phase-matched Quadratic Media
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作者 WANGFei-Yu CHENXian-Feng CHENYu-Ping YANGYi XIAYu-Xing 《Communications in Theoretical Physics》 SCIE CAS CSCD 2005年第4期732-734,共3页
We theoretically investigate the evolvement of dark spatial soliton withcascading quadratic nonlinearity in quasi-phase-matched second harmonic generation. It is shown thatthe dark solitary wave can propagate stably w... We theoretically investigate the evolvement of dark spatial soliton withcascading quadratic nonlinearity in quasi-phase-matched second harmonic generation. It is shown thatthe dark solitary wave can propagate stably when background intensity is large enough, in whichdiffraction of beam can be balanced by the cascading quadratic nonlinearity. We also analyze theinfluence of phase-mismatch on the stabihty of dark soliton propagation. 展开更多
关键词 dark spatial soliton cascaded quadratic nonlinearity
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Electro-optically tunable self-focusing and self-defocusing in KTP crystals by a cascaded second-order process
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作者 Ruma Debnath Digvijay Singh Hada +1 位作者 Susheel Kumar Beda Ardhendu Saha 《Chinese Optics Letters》 SCIE EI CAS CSCD 2016年第12期103-107,共5页
We report the transformation of a linear electro-optically tunable non-phase-matched second-order nonlinear process into a cascaded second-order nonlinear process in a bulk KTP crystal to generate the effect of electr... We report the transformation of a linear electro-optically tunable non-phase-matched second-order nonlinear process into a cascaded second-order nonlinear process in a bulk KTP crystal to generate the effect of electrooptically tunable Kerr-type nonlinearity. By applying an electric field on the x–y plane, parallel to the z-axis of the crystal, phase mismatch is created, which introduces a nonlinear phase shift between the launched and reconverted fundamental waves from the generated second harmonic wave. Due to the nonuniform radial intensity distribution of a Gaussian beam, a curvature will be introduced into the fundamental wavefront, which focuses or defocuses the incident beam while propagating through the crystal. 展开更多
关键词 tunable cascaded optically focusing wavefront applying nonlinearity created harmonic matching
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Temporal-filtering dissipative soliton in an optical parametric oscillator 被引量:1
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作者 Hui Tong Fuyong Wang +2 位作者 Zhipeng Qin Guoqiang Xie Liejia Qian 《High Power Laser Science and Engineering》 SCIE CAS CSCD 2022年第2期80-86,共7页
Dissipative solitons have been realized in mode-locked fiber lasers in the theoretical framework of the Ginzburg±Landau equation and have significantly improved the pulse energy and peak power levels of such lase... Dissipative solitons have been realized in mode-locked fiber lasers in the theoretical framework of the Ginzburg±Landau equation and have significantly improved the pulse energy and peak power levels of such lasers.It is interesting to explore whether dissipative solitons exist in optical parametric oscillators in the framework of three-wave coupling equations in order to substantially increase the performance of optical parametric oscillators.Here,we demonstrate a temporalfiltering dissipative soliton in a synchronously pumped optical parametric oscillator.The temporal-gain filtering of the pump pulse combined with strong cascading nonlinearity and dispersion in the optical parametric oscillator enables the generation of a broad spectrum with a nearly linear chirp;consequently,a significantly compressed pulse and high peak power can be realized after dechirping outside the cavity.Furthermore,we realized,for the first time,dissipative solitons in an optical system with a negative nonlinear phase shift and anomalous dispersion,extending the parameter region of dissipative solitons.The findings may open a new research block for dissipative solitons and provide new opportunities for mid-infrared ultrafast science. 展开更多
关键词 cascading nonlinearity dissipative solitons optical parametric oscillators temporal filtering
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Investigation of Compressible Electromagnetic Flute Mode Instability in Finite Beta Plasma in Support of Z-pinch and Laboratory Astrophysics Experiments
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作者 V.I.Sotnikov V.V.Ivanov +6 位作者 R.Presura J.N.Leboeuf O.G.Onishchenko B.V.Oliver B.Jones T.A.Mehlhorn C.Deeney 《Communications in Computational Physics》 SCIE 2008年第8期611-623,共13页
Flute mode turbulence plays an important role in numerous applications,such as tokamak,Z-pinch,space and astrophysical plasmas.In a low beta plasma flute oscillations are electrostatic and in the nonlinear stage they ... Flute mode turbulence plays an important role in numerous applications,such as tokamak,Z-pinch,space and astrophysical plasmas.In a low beta plasma flute oscillations are electrostatic and in the nonlinear stage they produce large scale density structures co-mingling with short scale oscillations.Large scale structures are responsible for the enhanced transport across the magnetic field and appearance of short scales leads to ion heating,associated with the ion viscosity.In the present paper nonlinear equations which describe the nonlinear evolution of the flute modes treated as compressible electromagnetic oscillations in a finite beta inhomogeneous plasma with nonuniform magnetic field are derived and solved numerically.For this purpose the 2D numerical code FLUTE was developed.Numerical results show that even in a finite beta plasma flute mode instability can develop along with formation of large scale structures co-existing with short scale perturbations in the nonlinear stage. 展开更多
关键词 Flute instability plasma turbulence nonlinear cascades
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