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Instantaneous Temperature-rise History and Nonequilibrium Thermophysical Properties of Thin Films Irradiated by Transient Laser pulse

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Science China Mathematics 1993年第1期36卷 109-116页

作者：唐大伟曹卉周本濂何冠虎张才根 Institute of Metal Research Academia Sinica International Center for Materials Physics Academia Sinica Shanghai Institute of Technical Physics Academia Sinica

Recent development in the study of nonequilibrium thermophysical properties of thin films in our lab is reported. A high-speed indirect heating system by using 0.1 μs CO_2 laser pulse.was established. A photoelectric installation for micrometric length-change measurement, an infrared radiation pyrometer for transient temperature measurement, a high-speed acquisition system as recording device and microcomputer system for data treatmeat were developed. Using the systems, the traditional flash method is extended to the measurement of thermal diffusivity of the thin films of around 50 μm in thickness, and deviations of this method is analyzed for the case of thin film specimens. Nonsynchronous change of temperature rise and thermal expansion under transient heating was observed.

关键词： instantaneous temperature-rise history thin films nonequilibrium thermophysical properties transient laser pulse.

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2D semiclassical model for high harmonic generation from gas

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Science China Mathematics 2000年第11期43卷 1202-1207页

作者：陈黎明余玮张杰陈朝阳江文勉 Laboratory of Optical Physics Institute of Physics Chinese Academy of Sciences Beijing 100080 China Laboratory for Laser Fusion Institute of Nuclear Physics and Chemistry Mianyang 621900 China Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800 China Laboratory of Optical Physics Institute of Physics Chinese Academy of Sciences Beijing 100080 China Laboratory for Laser Fusion Institute of Nuclear Physics and Chemistry Mianyang 621900 China

The electron behavior in laser field is described in detail. Based on the ID semiclassical model, a2D semiclassical model is proposed analytically using 3D DC-tunneling ionization theory. Lots of harmonic features are explained by this model, including the analytical demonstration of the maximum electron energy 3.17U p Finally, some experimental phenomena such as the increase of the cutoff harmonic energy with the decrease of pulse.duration and the “anomalous” fluctuations in the cutoff region are explained by this model.

关键词： high harmonic generation tunneling ionization ultrashort laser pulse.

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Experimental EOS determination of aluminum at Mbar pressure

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Science China(Physics,Mechanics & Astronomy) 2004年第4期47卷 416-423页

作者： CHEN Jianping1,2, LI Ruxin1, ZENG Zhinan1, WANG Xingtao1 & XU Zhizhan1 1. Shanghai Institute of Optics and Fine Mechanics, Shanghai 201800, China 2. Beijing Aeronautical Technology Research Center, Beijing 100076, China Shanghai Institute of Optics and Fine Mechanics Shanghai China Beijing Aeronautical Technology Research Center Beijing China

A shock wave is driven by a laser pulse.of 1.2 ps duration (FWHM), with the intensity of ～1014 W/cm2 at 785 nm, irradiating a 500 nm thick aluminum foil. A chirped laser pulse.split from the main pulse.is used to detect the shock breakout process at the rear surface of the target based on frequency domain interferometry. The mean shock velocity determination benefits from the precise synchronization (＜100fs resolution) of the shock pump and probe laser pulse., which is calculated from the time the shock takes to travel the 500 nm thick aluminum. The released particle velocity determination benefits from the chirped pulse.frequency domain interferometry. The average shock velocity is 15.15 km/s and the shock release particle velocity is 15.24 km/s, and the corresponding pressure after shock is 3.12 Mbar under our experimental condition.

关键词： shock wave, equation of state, chirped laser pulse.

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