Author Affiliations
Abstract
State Key Laboratory of High Field Laser Physics and CAS Center for Excellence in Ultra-intense Laser Science, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, China
We report dispersion management based on a mismatched-grating compressor for a 100 PW level laser, which utilizes optical parametric chirped pulse amplification and also features large chirped pulse duration and an ultra-broadband spectrum. The numerical calculation indicates that amplified pulses with 4 ns chirped pulse duration and 210 nm spectral bandwidth can be directly compressed to sub-13 fs, which is close to the Fourier-transform limit (FTL). More importantly, the tolerances of the mismatched-grating compressor to the misalignment of the stretcher, the error of the desired grating groove density and the variation of material dispersion are comprehensively analyzed, which is crucially important for its practical application. The results demonstrate that good tolerances and near-FTL compressed pulses can be achieved simultaneously, just by keeping a balance between the residual second-, third- and fourth-order dispersions in the laser system. This work can offer a meaningful guideline for the design and construction of 100 PW level lasers.
100 PW level laser dispersion management mismatched-grating compressor High Power Laser Science and Engineering
2022, 10(6): 06000e38
Author Affiliations
Abstract
1 Shanghai Institute of Laser Plasma, China Academy of Engineering Physics, Shanghai, China
2 School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing, China
3 National Laboratory for High Power Laser Physics, Shanghai, China
4 Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, China
5 Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang, China
The capability of chirped-pulse compression and beam focusing of an object-image-grating self-tiling grating compressor is demonstrated in an optical parametric chirped-pulse amplification laser for the first time. Probe lasers for tiling error adjustments, which are generally required by the traditional tiled-grating compressor, are not needed in our demonstration any more. With the aid of the double-sized effective optical aperture of the second grating in the compressor, a 490 fs near-transform-limit pulse duration and a 90 μm near-diffraction-limit focal spot are obtained, synchronously, which are very close to the ones achieved by a non-tiled grating compressor with equal-sized individual gratings.
chirped pulse amplification grating compressor tiled grating Collection Of theses on high power laser and plasma physics
2014, 12(1): 1362
Author Affiliations
Abstract
1 中国工程物理研究院上海激光等离子体研究所, 上海 201800
2 中国科学院上海光学精密机械研究所, 上海 201800
Pivotal parameters and restricted condition of the grating-size-limited compressor in an ultra-short, ultra-intense laser system are analyzed, and three basic parameters are obtained. An optimal method for compressor to output a maximal pulse energy is developed, and the maximal output pulse energy of the grating-size-limited compressor is given. Compared with the traditional circular beam method, an advanced elliptical beam method is presented, which could be used to output much higher pulse energy, a smaller spot size and a larger focal intensity. Using numerical simulation, the maximal output pulse energy of the 500 mm grating compressor based on the circular beam and the elliptical beam are calculated separately. The results show that the 500 fs, 500 J, 1 PW pulse can be obtained without using tiled grating technology if elliptical beam method is used.
光学器件 光栅压缩器 拍瓦激光装置 啁啾脉冲放大 optical devices grating compressor petawatt laser facility chirped pulse amplification Collection Of theses on high power laser and plasma physics
2008, 6(1): 80
1 中国工程物理研究院上海激光等离子体研究所, 上海 201800
2 中国科学院上海光学精密机械研究所, 上海 201800
分析了超短超强激光系统中有限尺寸光栅压缩器设计的关键物理参数及约束条件,得到了压缩器优化的三项基本变量。给出了一种输出能量最大化的压缩器优化方法,进而确定了有限尺寸光栅压缩器的最大工作能力。针对传统的圆光束方案提出了改进的椭圆光束方案,增大了聚焦能量,减小了焦斑尺寸,提高了峰值聚焦功率密度。通过数值模拟对500 mm曝光口径介质膜光栅在圆光束和椭圆光束两种方案下的最大输出能力进行分析比较,指出单块光栅在椭圆光束方案下可以实现500 fs,500 J,1 PW的脉冲输出。
光学器件 光栅压缩器 拍瓦激光装置 啁啾脉冲放大
Author Affiliations
Abstract
1 中国科学院上海光学精密机械研究所高功率激光物理联合实验室, 上海 201800
2 中国工程物理研究院激光等离子体研究所, 上海 201800
Alignment errors of sub-aperture gratings in the optical design of tiled gratings and tiled grating compressors are almost unavoidable. It is important to study the relation between alignment errors and temporal properties of the tiled graing. Analyzed by pulse compression theory, the relation between these alignment errors and focused pulse width broadening is obtained. And the numerical calculation results show that planar alignment errors have much more important influences on the pulse duration, which must be controlled within 21.08 μrad, and the groove-width difference also affects the pulse duration severely, so the ratio between the groove-width difference and groove-width must be controlled within 10-5. From the point of view of eliminating angular dispersion, the planar tilt errors and groove parallelism can ompensate each other, and the groove-width difference and planar errors of tip can also compensate each other.
光学器件 拼接光栅压缩器 时域特性 脉冲展宽 偏差补偿 optical devices tiled grating compressor temporal property pulse-broadening alignment errors compensation Collection Of theses on high power laser and plasma physics
2007, 5(1): 113
1 中国科学院上海光学精密机械研究所高功率激光物理联合实验室, 上海 201800
2 中国工程物理研究院激光等离子体研究所, 上海 201800
在拼接光栅和拼接光栅压缩器的设计中,子光栅调节偏差不可避免,各维偏差与拼接光栅的时间特性之间的关系很关键。通过脉冲压缩理论分析得到各维偏差和聚焦脉冲时间宽度展宽之间的解析关系,从数值计算结果分析,面平行左右偏差对脉冲的时间宽度影响较大,必须控制在21.08 μrad内；条纹密度差异对脉冲宽度的影响很显著,相对条纹密度的比值应控制在10-5以内；从消除角色散的角度分析,面平行俯仰偏差和条纹平行度偏差可以相互补偿,条纹密度差异和面平行左右偏差也可以相互补偿。
光学器件 拼接光栅压缩器 时域特性 脉冲展宽 偏差补偿
Author Affiliations
Abstract
Shanghai Institute of Optics and Fine Mechanics, the Chinese Academy of Sciences, Shanghai 201800, China
Theory and experiment haw demonstrated that the coherent addition of multiple small gratings to form a larger grating is viable. an approach referred to as grating tiling. and the key technology of which is to control the relative position and orientation of each grating with high precision. According to the main factors that affect the performance of the tiled grating. We develop a five-DOF ultraprecision stage for the tiled grating experiment. The design and control of the mechanism is discussed and part of experiment results is presented.
grating compressor: tiled grating: flexure mechani Collection Of theses on high power laser and plasma physics
2005, 3(1): 85
