| GaAs中的飞秒自由感应衰减 |
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| 引用本文： | 李青,罗琦,丘志仁,李伟良,余向阳,周建英. GaAs中的飞秒自由感应衰减[J]. 光学学报, 2000, 20(1): 14-117 |
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| 作者姓名： | 李青 罗琦 丘志仁 李伟良 余向阳 周建英 |
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| 作者单位： | 中山大学超快速激光光谱学国家重点实验室,广州,510275 |
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| 基金项目： | 国家自然科学基金，国家教育部博士点基金，广东省自然科学 |
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| 摘 要： | 用双光束诱导半导体ＧａＡｓ的激子相干态，记录液氮温度样品的光电导信号随双脉冲之间延时的变化。实验与理论分析结果表明：对于均匀增宽的二能级体系，这种中以直接反映相干态的自由感应衰减。求解均匀增宽二能级体系，这种测量方法可以直接反映相干态的自由感应衰减。求解均匀增宽二能级体系的密度矩阵方程，拟合实验结果得到载流子相干态的退相时间Ｔ２＝１１５ｆｓ。
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| 关 键 词： | 自由感应衰减 光电导 相干态 砷化镓 |
| 收稿时间： | 1998-09-07 |
Time-Resolved Femtosecond Free-Induction-Decay in Semiconductor |
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| Li Qing,Luo Qi,Qiu Zhiren,Li Weiliang,Yu Xiangyang,Zhou jianying. Time-Resolved Femtosecond Free-Induction-Decay in Semiconductor[J]. Acta Optica Sinica, 2000, 20(1): 14-117 |
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| Authors: | Li Qing Luo Qi Qiu Zhiren Li Weiliang Yu Xiangyang Zhou jianying |
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| Abstract: | Coherent properties for excitons and for free carriers in intrinsic bulk GaAs are studied with femtosecond free induction decay (FID). The GaAs at 77 K is excited at its excitonic energy with dual fs pulses from a Ti:Sapphire laser and the FID is recorded through photocurrent detection. The dephasing rates are determined by comparing the FID with theoretical results for density matrix in homogeneouse brodening two level system. |
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| Keywords: | free induction decay photoconductivity coherent state. |
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