用飞秒相干反斯托克斯拉曼散射（fs-CARS）技术研究γ射线辐照蓝宝石晶体中的声子动力学。

Phonon dynamics in γ-ray irradiated sapphire crystals studied by fs-CARS technique.

作者信息

Du Xin, Zhang Mingfu, Meng Qingkun, Song Yunfei, He Xing, Yang Yanqiang, Han Jiecai

机构信息

Department of Physics, Center for Condensed Matter Science and Technology, Harbin Institute of Technology, Harbin 150001, China.

出版信息

Opt Express. 2010 Oct 25;18(22):22937-43. doi: 10.1364/OE.18.022937.

DOI:10.1364/OE.18.022937

PMID:21164632

Abstract

We have studied the ultrafast dynamics of coherent phonons in sapphire crystals irradiated with 60Co γ-rays for three different doses by femtosecond time-resolved coherent anti-Stokes Raman scattering (fs-CARS) technique at room temperature. The obtained fs-CARS signals exhibit well-defined quantum beats, which are ascribed to the interference of the 645 and 750 cm-1 phonon modes. The dephasing times of the two modes both decrease with increasing irradiation dose, which is due to the scattering of coherent phonons by the defects introduced by γ-ray irradiation.

摘要

我们利用飞秒时间分辨相干反斯托克斯拉曼散射（fs-CARS）技术，在室温下研究了用60Coγ射线辐照三种不同剂量的蓝宝石晶体中相干声子的超快动力学。所获得的fs-CARS信号呈现出清晰的量子拍，这归因于645和750 cm-1声子模式的干涉。两种模式的退相时间均随辐照剂量的增加而减小，这是由于γ射线辐照引入的缺陷对相干声子的散射所致。