ULTRAFAST OPTICAL NONLINEARITIES OF TYPE-II ALXGA1-XAS/ALAS MULTIPLE QUANTUM-WELLS

被引：17

作者：

FELDMANN, J ^{[1
]}

GOBEL, E ^{[1
]}

PLOOG, K ^{[1
]}

机构：

[1] MAX PLANCK INST FESTKORPERFORSCH,W-7000 STUTTGART 80,GERMANY

来源：

APPLIED PHYSICS LETTERS | 1990年 / 57卷 / 15期

关键词：

D O I：

10.1063/1.103382

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We present experimental studies of the transient optical nonlinearities near the direct band gap of type II AlxGa1-xAs/AlAs multiple quantum wells. The response of the optical nonlinearity at the band-gap excitonic transition is critically dependent on laser photon energy. A complete recovery of the bleached absorption in the lower part of the excitonic resonance with a picosecond time constant at room temperature occurs due to an enhanced collision broadening of the excitonic resonance after the fast spatial Γ-X transfer. Our results demonstrate that the intrinsic response of optical devices based on exciton nonlinearities can be much faster in type II structures as compared to type I structures.

引用

页码：1520 / 1522

页数：3

共 13 条

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