Champion Audrey, Beresna Martynas, Kazansky Peter, Bellouard Yves
Opt Express. 2013 Oct 21;21(21):24942-51. doi: 10.1364/OE.21.024942.
Under certain exposure conditions, femtosecond lasers create nanogratings in the bulk of fused silica for which the orientation is governed by the laser polarization. Such nanostructure induces stress that affects optical and chemical properties of the material. Here, we present a method based on optical retardance measurement to quantify the stress around laser affected zones. Further, we demonstrate stress dependence on the nanogratings orientation and we show that the stress within single nanogratings lamellae can locally be as high as several gigapascals.
在某些曝光条件下，飞秒激光会在熔融石英内部产生纳米光栅，其取向由激光偏振决定。这种纳米结构会诱导应力，进而影响材料的光学和化学性质。在此，我们提出一种基于光学延迟测量的方法，用于量化激光影响区域周围的应力。此外，我们证明了应力对纳米光栅取向的依赖性，并表明单个纳米光栅薄片内的应力局部可高达几吉帕斯卡。
