具有紧凑、高效、大色散、高损伤的脉冲压缩与展宽器件一直是高功率超短脉冲激光技术的核心器件。本项目提出一种新型复合非均匀结构Bragg器件，并开展其在大色散延迟脉冲压缩与展宽方面的应用研究。结合耦合波理论和F矩阵，建立复合非均匀结构Bragg器件的物理模型和结构参数设计方法，分析其衍射特性与群色散延迟特性。研究光热敏折变玻璃的光敏和析晶特性以及非均匀光栅的写入技术，制备复合非均匀结构Bragg器件。开展复合非均匀结构Bragg器件的性能表征研究，明确器件输出的脉冲时空特性。理论与实验相结合，开展基于复合非均匀结构Bragg器件的ns级至百ps级脉冲压缩与展宽技术研究。

The pulse compression and stretching device with compact, high efficiency, large dispersion and high damage threshold is always the core device in high-power ultra-short laser technology. In this project, a novel Bragg device with composite non-uniformity structure is proposed. The application of pulse compression and stretching with large dispersion based on the Bragg device will be studied. Combining on the coupled-wave theory and F matrix, the physical model and structural design method of the Bragg device will be built. The characteristics of diffraction and dispersion will be researched. Based on the research on the photo-sensitivity and crystallization characteristics of photo-thermo-refractive glass and non-uniformity grating-writing technology, the composite non-uniformity Bragg device will be fabricated. Performance of the composite non-uniformity Bragg device will be characterized and the time-space characteristics of output laser pulse will be analyzed. The pulse compression and stretching from ns to hundreds of ps based on the composite non-uniformity Bragg device will be researched theoretically and experimentally.