Opt Express. 2023 Apr 24;31(9):14521-14531. doi: 10.1364/OE.484287.
We report a novel modified Gires-Tournois interferometer (MGTI) starting design for high-dispersive mirrors (HDMs). The MGTI structure combines multi-G-T and conjugate cavities and introduces a large amount of dispersion while covering a wide bandwidth. With this MGTI starting design, a pair of positive (PHDM) and negative highly dispersive mirrors (NHDM) providing group delay dispersions of +1000 fs and -1000 fs in the spectral range of 750 nm to 850 nm is developed. The pulse stretching and compression capabilities of both HDMs are studied theoretically by simulating the pulse envelopes reflected from the HDMs. A near Fourier Transform Limited pulse is obtained after 50 bounces on each positive and negative HDM, which verifies the excellent matching between the PHDM and NHDM. Moreover, the laser-induced damage properties of the HDMs are studied using laser pulses of 800 nm and 40 fs. The damage thresholds of the PHDM and NHDM are approximately 0.22 J/cm and 0.11 J/cm, respectively. The laser-induced blister structure of the HDMs is observed, the formation and evolution processes of the blister are evaluated.
我们报告了一种新颖的高色散镜（HDM）用改良 Gires-Tournois 干涉仪（MGTI）起始设计。该 MGTI 结构结合了多 G-T 和共轭腔，并在覆盖宽带宽的同时引入了大量的色散。使用这种 MGTI 起始设计，我们开发出了一对正（PHDM）和负高色散镜（NHDM），在 750nm 至 850nm 的光谱范围内提供了+1000fs 和-1000fs 的群延迟色散。通过模拟从 HDM 反射的脉冲包络，我们从理论上研究了这两种 HDM 的脉冲拉伸和压缩能力。在每个正和负的 HDM 上进行 50 次反射后，得到了一个接近傅里叶变换限制的脉冲，这验证了 PHDM 和 NHDM 之间的优异匹配。此外，我们使用 800nm 和 40fs 的激光脉冲研究了 HDM 的激光诱导损伤特性。PHDM 和 NHDM 的损伤阈值分别约为 0.22J/cm 和 0.11J/cm。我们观察了 HDM 的激光诱导鼓包结构，并评估了鼓包的形成和演化过程。
