• Special Issue
  • Large Scale Laser and Plasma Acceleration
  • 5 Article (s)
Effects of target pre-heating and expansion on terahertz radiation production from intense laser-solid interactions
X.H. Yuan, Y. Fang, D.C. Carroll, D.A. MacLellan, F. Du, N. Booth, M. Burza, M. Chen, R.J. Gray, Y.F. Jin, Y.T. Li, Y. Liu, D. Neely, H. Powell, G. Scott, C.-G. Wahlström, J. Zhang, P. McKenna, and Z.M. Sheng
High Power Laser Science and Engineering
  • Publication Date: Jan. 01, 1900
  • Vol.2 Issue, 1 010000e5 (2014)
Electromagnetic radiation from laser wakefields in underdense plasma
Yue Liu, Wei-Min Wang, and Zheng-Ming Sheng
It is demonstrated by simulations and analysis that a wakefield driven by an ultrashort intense laser pulse in underdense plasma can emit tunable electromagnetic radiation along the laser propagation direction. The profile of such a kind of radiation is closely associated with the structure of the laser wakefield. In general, electromagnetic radiation in the terahertz range with its frequency a few times the electron plasma frequency can be generated in the moderate intensity regime. In the highly nonlinear case, a chain of radiation pulses is formed corresponding to the nonlinear structure of the wake. Study shows that the radiation is associated with the self-modulation process of the laser pulse in the wakefield and resulting transverse electron momenta from modulated asymmetric laser fields.
High Power Laser Science and Engineering
  • Publication Date: Jan. 01, 1900
  • Vol.2 Issue, 1 010000e7 (2014)
Scaling and design of high-energy laser plasma electron acceleration
Kazuhisa Nakajima, Hyung Taek Kim, Tae Moon Jeong, and Chang Hee Nam
Recently there has been great progress in laser-driven plasma-based accelerators by exploiting high-power lasers, where electron beams can be accelerated to multi-GeV energy in a centimeter-scale plasma due to the laser wakefield acceleration mechanism. While, to date, worldwide research on laser plasma accelerators has been focused on the creation of compact particle and radiation sources for basic sciences, medical and industrial applications, there is great interest in applications for high-energy physics and astrophysics, exploring unprecedented high-energy frontier phenomena. In this context, we present an overview of experimental achievements in laser plasma acceleration from the perspective of the production of GeV-level electron beams, and deduce the scaling formulas capable of predicting experimental results self-consistently, taking into account the propagation of a relativistic laser pulse through plasma and the accelerating field reduction due to beam loading. Finally, we present design examples for 10-GeV-level laser plasma acceleration, which is expected in near-term experiments by means of petawatt-class lasers.
High Power Laser Science and Engineering
  • Publication Date: Jan. 01, 1900
  • Vol.3 Issue, 1 01000e10 (2015)
Splicing technology of Ti:sapphire crystals for a high-energy chirped pulse amplifier laser system
Yanqi Liu, Yuxin Leng, Xiaoming Lu, Yi Xu, and Cheng Wang
We develop a splicing technology of Ti:sapphire crystals for a high-energy chirped pulse amplifier laser system that can suppress the parasitic lasing to improve the amplification efficiency compared to a large-size single Ti:sapphire crystal amplifier. Theoretical investigations on the characteristics of the amplifier with four splicing Ti:sapphire crystals, such as parasitic-lasing suppression and amplification efficiencies, are carried out. Some possible issues resulting from this splicing technology, including spectral modulation, stretching or splitting of the temporal profile, and the sidelobe generation in the spatial domain (near field and far field), are also investigated. Moreover, the feasibility of the splicing technology is preliminarily demonstrated in an experiment with a small splicing Ti:sapphire crystals amplifier. The temporal profile and spatial distribution of the output pulse from the splicing Ti:sapphire crystal amplifier are discussed in relation to the output pulse from a single Ti:sapphire crystal amplifier.
High Power Laser Science and Engineering
  • Publication Date: Jan. 01, 1900
  • Vol.2 Issue, 2 02000e11 (2014)