期刊文献+
共找到3篇文章
< 1 >
每页显示 20 50 100
A theoretical model of the femtosecond laser ablation of semiconductors considering inverse bremsstrahlung absorption
1
作者 林晓辉 张赤斌 +2 位作者 任维松 蒋书运 欧阳全会 《Journal of Semiconductors》 EI CAS CSCD 2012年第4期144-148,共5页
The mechanism of the femtosecond laser ablation of semiconductors is investigated. The collision pro cess of free electrons in a conduction band is depicted by the test particle method, and a theoretical model of none... The mechanism of the femtosecond laser ablation of semiconductors is investigated. The collision pro cess of free electrons in a conduction band is depicted by the test particle method, and a theoretical model of nonequilibrium electron transport on the femtosecond timescale is proposed based on the FokkerPlanck equa tion. This model considers the impact of inverse bremsstrahlung on the laser absorption coefficient, and gives the expressions of electron drift and diffusion coefficients in the presence of screened Coulomb potential. Numerical simulations are conducted to obtain the nonequilibrium distribution function of the electrons. The femtosecond laser ablation thresholds are then calculated accordingly, and the results are in good agreement with the experimental results. This is followed by a discussion on the impact of laser parameters on the ablation of semiconductors. 展开更多
关键词 femtosecond laser nonequilibrium distribution inverse bremsstrahlung absorption ablation mecha-nism
原文传递
Cluster-assisted generation of multi-charged ions in nanosecond laser ionization of pulsed hydrogen sulfide beam at 1064 and 532 nm 被引量:1
2
作者 牛冬梅 李海洋 +3 位作者 罗晓琳 梁峰 程爽 李安林 《Chinese Physics B》 SCIE EI CAS CSCD 2006年第7期1511-1516,共6页
The multi-charged sulfur ions of Sq^+ (q ≤ 6) have been generated when hydrogen sulfide cluster beams are irradiated by a nanosecond laser of 1064 and 532 nm with an intensity of 10^10- 10^12W.cm^-2. S^6+ is the ... The multi-charged sulfur ions of Sq^+ (q ≤ 6) have been generated when hydrogen sulfide cluster beams are irradiated by a nanosecond laser of 1064 and 532 nm with an intensity of 10^10- 10^12W.cm^-2. S^6+ is the dominant multicharged species at 1064 nm, while S^4+, S^3+ and S^2+ ions are the main multi-charged species at 532 nm. A three-step model (i.e., multiphoton ionization triggering, inverse bremsstrahlung heating, electron collision ionizing) is proposed to explain the generation of these multi-charged ions at the laser intensity stated above. The high ionization level of the clusters and the increasing charge state of the ion products with increasing laser wavelength are supposed mainly due to the rate-limiting step, i.e., electron heating by absorption energy from the laser field via inverse bremsstrahlung, which is proportional to λ2,λA being the laser wavelength. 展开更多
关键词 CLUSTER multi-charged ion inverse bremsstrahlung absorption electron impact ionization
原文传递
A Fokker-Planck Code for Laser-Produced Plasmas 被引量:1
3
作者 赵斌 郑坚 《Plasma Science and Technology》 SCIE EI CAS CSCD 2008年第1期22-26,共5页
A Fokker-Planck code is developed based upon Epperlein's scheme to investigate laser-produced plasmas in relevance to inertial confinement fusion. The equations are integrated implicitly by time-splitting method. Thr... A Fokker-Planck code is developed based upon Epperlein's scheme to investigate laser-produced plasmas in relevance to inertial confinement fusion. The equations are integrated implicitly by time-splitting method. Three test problems are simulated to show the versatility of the code. The results are in good agreement with the existing simulations. 展开更多
关键词 FOKKER-PLANCK inverse bremsstrahlung absorption laser-produced plasma electron transport
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部