用于高能拍瓦激光器的具有补偿时空耦合的内部分束脉冲压缩器
In-house beam-splitting pulse compressor with compensated spatiotemporal coupling for high-energy petawatt lasers
摘要：
实现千焦级高能拍瓦（PW）到百拍瓦（100 PW）脉宽为ps到fs的激光器的最大瓶颈之一是压缩器中需要大到米级的光栅，以避免激光对光栅的损伤。然而，这种高质量的米级光栅目前还很难制造。在这里，我们提出了一种新的内部分束压缩器的基础上的属性，即光栅的损伤阈值依赖于脉冲宽度。新方案由于分束光束共用前两个平行光栅，在提高稳定性的同时，节省了昂贵的光栅，并简化了压缩器的尺寸。此外，基于玻璃板的透射波前比大光栅的衍射波前能更好、更精确地控制这一事实，提出了设计透射波前的玻璃板来补偿由第二、第三光栅和其他内部光学器件（如分束器）引入的波前畸变。这种方法简单、经济，可以补偿压缩器内的时空畸变，从而提高压缩器外变形镜由于角啁啾而无法补偿的焦强。与多光束拼接孔径组合方案相结合，新的压缩器提供了一种新的方案，以实现高能量PW-100 PW激光器，甚至艾瓦激光器相对较小的光栅在未来。
英文摘要：
One of the most serious bottleneck on achieving kilojoule-level high-energy petawatt (PW) to hundreds-petawatt (100PW) lasers with ps to fs pulse duration is the requirement of as large as meter-sized gratings in the compressor so as to avoid the laser-induced damage to the gratings. However, this kind of meter-sized grating with high quality is hard to manufacture so far. Here, we propose a new in-house beam-splitting compressor based on the property that the damage threshold of gratings depend on the pulse duration. The new scheme will simultaneously improve the stability, save expensive gratings, and simplify the size of compressor because the split beams share the first two parallel gratings. Furthermore, based on the fact that the transmitted wavefront of a glass plate can be much better and more precisely controlled than that of the diffraction wavefront of a large grating, then glass plates with designed transmitted wavefront are proposed to compensate the wavefront distortion introduced by the second, the third gratings, and other optics in-house such as the beam splitter. This simple and economical method can compensate the space-time distortion in the compressor and then improve the focal intensity, which otherwise cannot be compensated by the deformable mirror outside the compressor due to angular chirp. Together with multi-beams tiled-aperture combining scheme, the novel compressor provides a new scheme to achieve high-energy PW-100PW lasers or even exawatt lasers with relatively small gratings in the future.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
