超快激光在纳米溶液中的超连续光丝光谱技术

Supercontinuum generation technique for ultrafast laser filamentation in nanoparticle-doped water

为了产生宽谱带超连续白光光谱,将飞秒激光聚焦到纳米溶液中形成光丝,最终产生出400~950 nm的超连续白光光谱。采用集成CCD的显微镜装置对伴随光丝的气泡进行拍摄,并研究了气泡定向运动的规律。计算表明,气泡的运动速度可以达到0.16 m/s,这表明水流也可以达到相应的速度。这种由光丝导致的高速水流,可对微流控技术的研究起到积极的作用。

It is well known that femtosecond laser filamentation can be initiated by ultrashort laser pulses in condensed media.The supercontinuum generation was studied with the generated white light ranging from 400 to 950 nm in nanoparticle-doped water.We summarized the motion of the generated bubbles.The velocity of the bubble reached 0.16 m/s,and it means that the water flow can also reach the corresponding speed.This could be a potential technique for microfluidic chip fabrications.