论文部分内容阅读
提出了基于前端发生器和终端放大器,使用光泵浦XeF(C-A)激活介质的太瓦级混合激光器(THL-100)系统。前端发生器由长532 nm的连续激光泵浦的钛宝石飞秒脉冲振荡器,脉冲展宽机构,532 nm的脉冲激光泵浦的再生多通道放大器,衍射光栅压缩器和二次谐波发生器(KDP)组成。其光束输出参数为:脉冲持续时间50 fs,二次谐波(475 nm)辐射能量5 mJ。前端发生器以10 Hz的单脉冲模式工作。XeF(C-A)放大器由双高压脉冲发生器(线性变压器),爆炸式阴极发射真空二极管,电子束注入系统,充满Xe的气室转换器和激光单元组成。高压发生器包括12个变压器,每个变压器有8个电容(40 nF)和火花隙,电容可以充电至100 kV。真空二极管中的电子束参数为:总电流300 kA,峰值电压550kV,脉冲持续时间约150 ns。穿透金属箔片到达Xe转换器的6个100 cm×12 cm电子束的总能量为6~7 kJ。激光系统通过泵浦能量的级联处理导致Xe2*的快速形成,并在(172±5)nm连续辐射。真空紫外辐射通过CaF2窗口辐射到含有XeF2蒸汽和氮气缓冲气体的激光单元中,使XeF2光解,形成XeF*准分子。由真空紫外辐射泵浦的放大器激活介质长110 cm,直径为24 cm。文中通过数值模拟给出了输出参数和第一实验结果,根据XeF(C-A)放大器参数模型和增益测量结果,得到的输出能量高达2~3 J,这意味着50 fs脉冲的峰值功率高达40~60 TW。
A THW-100 system based on front-end generator and terminal amplifier using optically pumped XeF (C-A) activator is proposed. The front-end generator consists of a Ti: Sapphire femtosecond pulse oscillator pumped at 532 nm of continuous laser, a pulse broadening mechanism, a 532 nm pulsed laser pumped regenerative multichannel amplifier, a diffraction grating compressor and a second harmonic generator KDP). The beam output parameters are: pulse duration 50 fs, second harmonic (475 nm) radiant energy 5 mJ. The front-end generator operates in single-pulse mode at 10 Hz. The XeF (C-A) amplifier consists of a dual high-voltage pulse generator (linear transformer), an explosive cathode-emitting vacuum diode, an electron beam injection system, a gas cell converter filled with Xe and a laser unit. The high voltage generator consists of 12 transformers, each with 8 capacitors (40 nF) and a spark gap, which can be charged to 100 kV. The electron beam parameters in the vacuum diode are: total current 300 kA, peak voltage 550 kV, pulse duration about 150 ns. The total energy of six 100 cm × 12 cm electron beams that penetrate the metal foil reaching the Xe converter is 6-7 kJ. The laser system causes a rapid formation of Xe2 * by a cascade of pump energies and continues to radiate at (172 ± 5) nm. Vacuum ultraviolet radiation is radiated through a CaF2 window into a laser cell containing XeF2 vapor and a nitrogen buffer gas, photolysising XeF2 to form XeF * excimer. The amplifier activated by vacuum ultraviolet radiation has an activation medium length of 110 cm and a diameter of 24 cm. In this paper, the output parameters and the first experimental results are given by numerical simulation. According to the XeF (CA) amplifier parameter model and gain measurement results, the output energy is up to 2 ~ 3 J, which means that the peak power of 50 fs pulse reaches 40 ~ 60 TW.