中文摘要：

提出了一种用于飞秒钛宝石激光器的复合型透射式脉冲压缩光栅。该光栅由1 250line/mm和3 300line/mm两种光栅集成在一个熔石英基底上制成,其工作中心波长为800nm,工作波段为700~900nm。1 250line/mm光栅用于脉冲压缩;3 300line/mm光栅的运用则有益于减少透射光栅的反射损失,同时由于采用高频光栅结构代替了传统增透膜,可有效减少光栅基底的波前形变。该复合光栅完全由熔石英材料构成,故具有很高的损伤阈值。利用严格耦合波理论对该复合型透射光栅的微结构进行了优化设计,结果表明：1 250line/mm光栅在中心波长800nm处的-1级衍射效率可达98%;3 300line/mm增透光栅的透过率在700~900nm波段可以达到99.7%以上。最后,应用全息记录技术和离子刻蚀技术实际制备了Φ65mm×1mm的复合式透射脉冲压缩光栅,实测衍射效率与理论设计相符。

英文摘要：

A composite transmission pulse compression grating was proposed for femto-second Ti ＂ sapphire la- sers. The composite transmission grating with 700--900 nm bandwidth worked at a center wavelength of 800 nm was consisted of two gratings with groove densities 1 250 line/ram and 3 300 line/mm and they were integrated in a fused silica plate. The 1 250 line/ram grating was used for compressing laser pulse. The 3 300 line/ram anti- reflection grating was conductive to decreasing the reflection loss and avoiding the wave-front distortion by using a high frequency grating structure to replace the anti-reflection film on the surface oi the Iusea sllma plato, vxm~- pletely being made of fused silica, the composite pulse compression grating has a high laser damage threshold. The composite transmission grating was designed based on the rigorous coupled wave theory. The optimization caleulation results show that the --lst order diffraction efficiency of the 1 250 line/ram grating is up to 98% （@ 800 nm） and the transmission of the 3 300 lp/mm grating is up to 99.7% at 700--900 nm bandwidth. Finally, the composite transmission pulse compression grating（Ф65 mm× 1 mm） was fabricated by holographic recording and ion bean etching and its diffraction efficiency is co＇incident with that of the theoretical analysis.