用于高平均功率下高效超快laser脉冲压缩的低色散低损耗介质光栅
Low-dispersion low-loss dielectric gratings for efficient ultrafast laser pulse compression at high average powers
摘要：
我们已经开发出低色散（1480 l/mm），无共振，衍射光栅的介电材料耐飞秒激光损伤$(SiO_{2}/HfO_{2})$。用能制作对角线达1 m的光栅的设备制作了直径为14 cm的样品，在λ = 810 nm处的平均衍射效率为99.1%，均匀性为0.4%。这些光栅在面外几何结构中压缩30 fs脉冲的实现可以导致压缩器效率为~ 95%。测得的激光吸收比目前的超快拍瓦级压缩器光栅低500倍，这将使这些激光系统的平均功率处理能力大幅增加。
英文摘要：
We have developed low-dispersion (1480 l/mm), resonance-free, diffraction gratings made of dielectric materials resistant to femtosecond laser damage $(SiO_{2}/HfO_{2})$. A 14 cm diameter sample was fabricated resulting in a mean diffraction efficiency of 99.1% at λ = 810 nm with 0.4% uniformity using equipment which can fabricate gratings up to 1m diagonal. The implementation of these gratings in the compression of 30 fs pulses in an out-of-plane geometry can result in compressor efficiencies of ~95%. The measured laser absorption is 500x lower than current ultrafast petawatt-class compressor gratings which will enable a substantial increase in average power handling capabilities of these laser systems.
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