Optical two-photon absorption in GaAs measured by optical-pump terahertz-probe spectroscopy

被引：45
|
作者：
Kadlec, F
Nemec, H
Kuzel, P
机构：
[1] Acad Sci Czech Republic, Inst Phys, Prague 18221 8, Czech Republic
[2] Ctr Mol Syst & Biomolecules, Prague 18221 8, Czech Republic
来源：
PHYSICAL REVIEW B | 2004年 / 70卷 / 12期
关键词：
D O I：
10.1103/PhysRevB.70.125205
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Time-resolved terahertz experiments in a novel setup were used for a direct observation of the competition between the single- and two-photon absorption in highly excited GaAs. The experiments were carried out near 800 nm where the single photon absorption usually dominates. The crystal surface was excited by femtosecond laser pulses with fluences up to 4.2 mJ/cm(2), for which the single-photon absorption saturates and the two-photon absorption becomes the leading absorption mechanism. The two-photon absorption coefficient beta, its anisotropy and the depth profile of the photoexcited carriers were determined.
引用
收藏
页码：125205 / 1
页数：6
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