超快泵探针对GaAs中X射线诱导的瞬态光学反射率变化的探测 |
| |
引用本文: | 王博,白永林,徐鹏,缑永胜,朱炳利,白晓红,刘百玉,秦军君.超快泵探针对GaAs中X射线诱导的瞬态光学反射率变化的探测[J].红外与激光工程,2015,44(10):3130-3133. |
| |
作者姓名: | 王博 白永林 徐鹏 缑永胜 朱炳利 白晓红 刘百玉 秦军君 |
| |
作者单位: | 1.中国科学院西安光学精密机械研究所瞬态光学与光子技术国家重点实验室,陕西 西安 710119; |
| |
基金项目: | 国家自然科学基金(11305259) |
| |
摘 要: | 理论估算并实验验证了在X射线脉冲激发下低温砷化镓的光学折射率调制特性。泵浦-探针实验表明,低温砷化镓中存在的高密度复合缺陷大大减小了载流子寿命,使超热电子的弛豫时间小于110-12 s,载流子的复合时间小于 210-12 s,折射率的扰动时间约为210-12 s。通过理论分析,给出了自由载流子和俄歇效应对该弛豫过程的定量估算,与实验结果吻合较好。该研究表明低温生长砷化镓是一种有效的可用于单次瞬态皮秒时间分辨X射线探测的材料。
|
关 键 词: | 低温生长砷化镓 X射线探测器 折射率扰动 皮秒时间分辨 |
收稿时间: | 2015-02-06 |
Ultrafast pu mp-probe detection of X-ray induced transient optical reflecti vity changes in GaAs |
| |
Affiliation: | 1.State Key Laboratory of Transient Optics and Photonics,Xi'an Institute of Optics and Precision Mechanics,Chinese Academy of Sciences,Xi'an 710119,China;2.Key Laboratory of Ultra-fast Photoelectric Diagnostics Technology,Xi'an Institute of Optics and Precision Mechanics,Chinese Academy of Sciences,Xi'an 710119,China;3.University of Chinese Academy of Sciences,Beijing 100049,China |
| |
Abstract: | The optical index modulation was theoretically estimated and demonstrated under short X-ray excitation in low-temperature-grown GaAs(LT_GaAs). Hot-electron thermalization time 1 ps, carrier recombination time 2 ps and the duration of the index perturbation was determined by the carrier recombination time which was of order -2 ps in LT_GaAs with a high density of recombination defects. Predictions of radiation-induced changed in the optical refractive index were in reasonably good agreement with the limited experimental data available, suggesting that LT_GaAs was a highly promising material for high speed single transient ionizing radiation detector. |
| |
Keywords: | |
本文献已被 万方数据 等数据库收录! |
| 点击此处可从《红外与激光工程》浏览原始摘要信息 |
|
点击此处可从《红外与激光工程》下载全文 |
|