• Special Issue
  • High Energy Density Physics and High Power Laser 2014
  • 10 Article (s)
Conceptual design of the Kumgang laser: a high-power coherent beam combination laser using SC-SBS-PCMs towards a Dream laser
Hong Jin Kong, Sangwoo Park, Seongwoo Cha, Heekyung Ahn, Hwihyeong Lee, Jungsuk Oh, Bong Ju Lee, Soungwoong Choi, and Jom Sool Kim
High Power Laser Science and Engineering
  • Publication Date: Jan. 01, 1900
  • Vol.3 Issue, 1 010000e1 (2015)
Design and current progress of the Apollon 10 PW project
J.P. Zou, C. Le Blanc, D.N. Papadopoulos, G. Chériaux, P. Georges, G. Mennerat, F. Druon, L. Lecherbourg, A. Pellegrina, P. Ramirez, F. Giambruno, A. Fréneaux, F. Leconte, D. Badarau, J.M. Boudenne, D. Fournet, T. Valloton, J.L. Paillard, J.L. Veray, M. Pina, P. Monot, J.P. Chambaret, P. Martin, F. Mathieu, P. Audebert, and F. Amiranoff
High Power Laser Science and Engineering
  • Publication Date: Jan. 01, 1900
  • Vol.3 Issue, 1 010000e2 (2015)
Application of image processing based on multiple filters in an alignment system
Peiying Zeng, Baoqiang Zhu, De’an Liu, and Jianqiang Zhu
Beam alignment depends on CCD real-time image analysis and processing. In order to improve the quality of the alignment, multiple filters are used in far-field and near-field image processings. These multiple filters are constituted of an average filter and a median filter in different connection sequences, so that they can deal with different kinds of noise. To reduce the effect of the unknown nonlinear relationship between motor running steps and deviation pixels, a feasible methodology is offered to improve this phenomenon and a fuzzy algorithm is applied to the motor feedback control process. Because of the fuzzy control it is not necessary to establish an accurate mathematical model, so the impact of the nonlinear relationship will be reduced.
High Power Laser Science and Engineering
  • Publication Date: Jan. 01, 1900
  • Vol.2 Issue, 3 03000e16 (2014)
Ultrafast ignition with relativistic shock waves induced by high power lasers
Shalom Eliezer, Noaz Nissim, Shirly Vinikman Pinhasi, Erez Raicher, and José Maria Martinez Val
In this paper we consider laser intensities greater than where the ablation pressure is negligible in comparison with the radiation pressure. The radiation pressure is caused by the ponderomotive force acting mainly on the electrons that are separated from the ions to create a double layer (DL). This DL is accelerated into the target, like a piston that pushes the matter in such a way that a shock wave is created. Here we discuss two novel ideas. Firstly, the transition domain between the relativistic and non-relativistic laser-induced shock waves. Our solution is based on relativistic hydrodynamics also for the above transition domain. The relativistic shock wave parameters, such as compression, pressure, shock wave and particle flow velocities, sound velocity and rarefaction wave velocity in the compressed target, and temperature are calculated. Secondly, we would like to use this transition domain for shock-wave-induced ultrafast ignition of a pre-compressed target. The laser parameters for these purposes are calculated and the main advantages of this scheme are described. If this scheme is successful a new source of energy in large quantities may become feasible.
High Power Laser Science and Engineering
  • Publication Date: Jan. 01, 1900
  • Vol.2 Issue, 3 03000e22 (2014)
Pump phase transfer and its control in hybrid seeded optical parametric amplifiers
Peng Yuan, Jingui Ma, Yongzhi Wang, Jing Wang, Daolong Tang, and Liejia Qian
Due to the existence of spatial walk-off and/or group-velocity mismatch effects, pump-to-signal phase transfer becomes inevitable during parametric amplification. We experimentally demonstrate that in hybrid seeded optical parametric amplifiers (OPAs) that include two OPA stages seeded by the signal and idler waves, respectively, the phase of the output signal can be restored to its initial value, although there are spatial and temporal phase fluctuations on the pump source. This method significantly relaxes the requirement for high pump beam quality, which is always very stringent in parametric amplification systems. With the introduction of this scheme into birefringent phase-matching OPAs or chirped-pulse OPAs, it should be promising to achieve intense femtosecond laser pulses that are close to the diffraction limit in space and ultra-high contrast in time, simultaneously.
High Power Laser Science and Engineering
  • Publication Date: Jan. 01, 1900
  • Vol.2 Issue, 4 04000e30 (2014)
Pulse fidelity in ultra-high-power (petawatt class) laser systems
Colin Danson, David Neely, and David Hillier
There are several petawatt-scale laser facilities around the world and the fidelity of the pulses to target is critical in achieving the highest focused intensities and the highest possible contrast. The United Kingdom has three such laser facilities which are currently open for access to the academic community: Orion at AWE, Aldermaston and Vulcan & Astra-Gemini at the Central Laser Facility (CLF), STFC (Science and Technology Facilities Council) Rutherford Appleton Laboratory (RAL). These facilities represent the two main classes of petawatt facilities: the mixed OPCPA/Nd:glass high-energy systems of Orion and Vulcan and the ultra-short-pulse Ti:Sapphire system of Astra-Gemini. Many of the techniques used to enhance and control the pulse generation and delivery to target have been pioneered on these facilities. In this paper, we present the system designs which make this possible and discuss the contrast enhancement schemes that have been implemented.
High Power Laser Science and Engineering
  • Publication Date: Jan. 01, 1900
  • Vol.2 Issue, 4 04000e34 (2014)
Tape casting of a YAG/Yb:YAG/YAG transparent ceramic for a broadband tunable laser
Chao Wang, Wenxue Li, Xianghui Yang, Dongbi Bai, Kangwen Yang, Xuewei Ba, Jiang Li, Yubai Pan, and Heping Zeng
High Power Laser Science and Engineering
  • Publication Date: Jan. 01, 1900
  • Vol.2 Issue, 4 04000e36 (2014)
High energy density physics research at IMP, Lanzhou, China
Yongtao Zhao, Rui Cheng, Yuyu Wang, Xianming Zhou, Yu Lei, Yuanbo Sun, Ge Xu, Jieru Ren, Lina Sheng, Zimin Zhang, and Guoqing Xiao
High Power Laser Science and Engineering
  • Publication Date: Jan. 01, 1900
  • Vol.2 Issue, 4 04000e39 (2014)