Modulation of transient stress distributions for controlling femtosecond laser-induced cracks inside a single crystal

摘要: After the photoexcitation by a femtosecond laser pulse inside LiF single crystal, four cracks appear in directions of crystal from photoexcited region. In our previous study, we found that laser-induced stress wave is responsible for generation and elongation crystal. This finding suggests can control modulating waves. this applied parallel fs irradiation with spatial light modulator to generate multiple waves at same time, modulation crack formation; one became thinner shorter than any other cracks. By pump-probe imaging dynamics generation, showed constructive interference tip could compress crack, which results crack.