利用飞秒时间选通技术对埋藏在高散射介质中的物体进行成像

Imaging Objects through Highly Scattering Media using Femtosecond Cross correlation Time gating

利用５０ｆｓ互相关时间选通门和锁相放大相结合，成功地实现了对埋藏在不同散射介质中的物体进行透射式成像。互相关时间选通门有效地选出了携带物体信息的弹道光子和蛇行光子，排除了给成像带来背景噪声的漫射光子。锁相放大器的采用进一步滤掉噪声，提高了对较厚散射介质的成像能力。

A combination of 50 fs cross correlation time gating and lock in amplifier detection is shown to be a versatile technique to image objects through various highly scattering medium.The ballistic component and snake component of the ultrafast laser pulse,which contain the information of the objects,are effectively selected,while the diffuse component,which contributes bright background noise to the image,is eliminated by time gating using femtosecond cross correlation secondharmonic generation.