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Dual-beam ultra high temporal contrast Ti:Sa laser system based on a double CPA technique

机译:基于双CPA技术的双光束超高时间对比度Ti:Sa激光系统

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Interaction of laser radiation with matter at relativistic intensity requires laser pulses with a very clean temporal shape. The temporal contrast of high intensity laser systems based on laser gain materials and optical parametric amplification is determined substantially by the level of amplified spontaneous emission (ASE) and parametric fluorescence, respectively, originating from the laser front end [1]. It is remarkable that the temporal contrast of amplified and recompressed pulses grows nearly linear with the energy injected in the laser power amplifiers. During the last few years considerable efforts have been devoted to increase the temporal ASE contrast of high intensity systems. These latters include the invention of the double chirped pulse amplification (DCPA) [2] architecture, that implements intermediate pulse recompression and nonlinear temporal filtering of the short pulse, investigation of nonlinear methods [3-6] required for the practical realization of a reliable DCPA, and also the development of plasma mirror technique [7], that supports substantial improvement of temporal contrast, but is currently applicable only to low repetition rate systems.
机译:相对论强度的激光辐射与物质的相互作用需要具有非常干净的时间形状的激光脉冲。基于激光增益材料和光学参量放大的高强度激光系统的时间对比度主要由分别来自激光器前端的放大自发发射(ASE)和参量荧光的水平决定[1]。值得注意的是,放大和重新压缩的脉冲的时间对比度与注入激光功率放大器的能量几乎成线性增长。在过去的几年中,已经进行了相当大的努力来增加高强度系统的时间ASE对比度。后者包括双chi脉冲放大(DCPA)[2]体系结构的发明,该体系结构实现了中间脉冲再压缩和短脉冲的非线性时间滤波,研究了实际实现可靠的非线性方法[3-6] DCPA,以及等离子镜技术的发展[7],支持时间对比度的显着改善,但目前仅适用于低重复率系统。

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