Stimulated terahertz emission from intraexcitonic transitions in Cu2O -: art. no. 017402

被引：58
|
作者：
Huber, R [1 ]
Schmid, BA
Shen, YR
Chemla, DS
Kaindl, RA
机构：
[1] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA
[2] EO Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA
来源：
PHYSICAL REVIEW LETTERS | 2006年 / 96卷 / 01期
关键词：
D O I：
10.1103/PhysRevLett.96.017402
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We report the first observation of stimulated emission of terahertz radiation from internal transitions of excitons. The far-infrared electromagnetic response of Cu2O is monitored via broadband terahertz pulses after ultrafast resonant excitation of three-dimensional 3p excitons. Stimulated emission from the 3p to the energetically lower 2s bound level occurs at a photon energy of 6.6 meV, with a cross section of similar to 10(-14) cm(2). Simultaneous excitation of both exciton levels, in turn, drives quantum beats, which lead to efficient terahertz emission sharply peaked at the difference frequency.
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页数：4
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