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Simulation on terahertz emission from air plasma induced by circularly polarized few-cycle laser pulses

Chinese Optics Letters 2014年第A2期12卷 157-159页

作者：王凤超 School of Science Shanghai Institute of Technology Shanghai 201418 China

We investigate the terahertz （THz） wave emission from air plasma by analyses and simulations. An elliptically polarized THz wave is generated, whereas a circularly polarized carrier-envelope phase （CEP） stabilized few-cycle laser pulse is applied. Its elliptieity and intensity depend on the pulse duration of the driving laser pulse. And the polarization rotates along the CEP of the driving laser pulse. The THz generation is also simulated for different filament lengths. As the filament extends, the polarization of the generated THz wave rotates along the filament.

关键词： 320.7110 Ultrafast nonlinear optics 350.5400 Plasmas 300.2140 Emission 260.5430 Polarization

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Cooling-induced increase of methane cluster size investigated under a Coulomb explosion scheme

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Chinese Optics Letters 2013年第14期11卷 10-13页

作者：李松卢海洋张辉 Kazuhisa Nakajima 刘建胜倪国权 State Key Laboratory of High Filed Laser Physics Shanghai Institute of Optics and Fine Mechanics the Chinese Academy of Sciences Shanghai 201800 China High Energy Accelerator Research Organization (KEK) Ibaraki 305-0801 Japan

In this letter, we discuss the increase in the average cluster size by lowering the stagnation temperature of the methane （CH4） gas. The Coulomb explosion experiments are conducted to estimate the cluster size and the size distribution. The average CH4 cluster sizes Nay of 6 230 and 6 580 are acquired with the source conditions of 30 bars at 240 K and 60 bars at 296 K, respectively. Empirical estimation suggests a five-fold increase in the average size of the CH4 clusters at 240 K compared with that at room temperature under a backing pressure of 30 bars. A strong nonlinear Hagena parameter relation （Г^＊∝ T0^-3.3） for the CH4 clusters is revealed. The results may be favorable for the production of large-sized clusters by using gases at low temperature and high back pressures.

关键词： 020.2649 Strong field laser physics 350.5400 Plasmas

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Investigations of ionization-induced injection of laser wake field acceleration using phenomenological model

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Chinese Optics Letters 2013年第14期11卷 114-117页

作者：陈强刘建胜李文涛邓爱华王文涛田野王成 State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800 China

We develop a phenomenological model to investigate dynamics of ionization-induced injection. In the ＂bubble＂ regime of laser wakefield acceleration （LWFA）, it is found that there is an upper limit for laser intensity of ionization-induced injection. In the plane perpendicular to the laser polarization, when the laser pulse is linearly polarized, ionization-induced injected electrons exhibit a filamented structure and semi-coherent betatron oscillation.

关键词： 350.5400 Plasmas 350.4990 Particles 350.5610 Radiation

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Full-aperture backscatter diagnostics and applications at the Texas Petawatt Laser facility

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Chinese Optics Letters 2014年第A2期12卷 152-156页

作者： C. Wang C. Wagner G. Dyer E. Gaul N. Kandadai N. Riley D. Kuk E. McCary A. Meadows I. Pomerantz M. Spinks T. Borger A. Bernstein M. Donovan M. Martinez T. Ditmire Bjorn M. Hegelich Center for High Energy Density Science University of Texas Austin Texas 78712

In this paper, we present the development and application of a full-aperture baekscatter diagnostics system at the Texas Petawatt Laser （TPW） facility. The diagnostic system includes three independent diagnostic stations. With this system, we obtained TPW on-shot focus properties, and high-harmonic spectral emission flOln solid foils （e.g., Cu and Al） and their Si substrate in an experiment to study laser hole boring, which show the hole-boring mechanism at relativistic intensities. The measured on-target full-power focal spots from ultrathin film targets help determine the optimum target thickness at certain laser contrast parameters for particle acceleration and neutron generation experiment, which is also a relative measurement of shot-to- shot intensity fluctuations.

关键词： 320.7090 Ultrafast lasers 020.2649 Strong field laser physics 300.6360 Spectroscopy, laser 350.5400 Plasmas

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