ROBUST INFRARED GRATINGS IN PHOTOREFRACTIVE QUANTUM-WELLS GENERATED BY AN ABOVE-BAND-GAP LASER

被引：17

作者：

NOLTE, DD ^{[1
]}

WANG, Q ^{[1
]}

MELLOCH, MR ^{[1
]}

机构：

[1] PURDUE UNIV,SCH ELECT ENGN,W LAFAYETTE,IN 47907

来源：

APPLIED PHYSICS LETTERS | 1991年 / 58卷 / 19期

关键词：

D O I：

10.1063/1.105012

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Probe beam intensities more than an order of magnitude larger than pump beam intensities do not erase photorefractive gratings during nondegenerate four-wave mixing in photorefractive GaAs/AlGaAs quantum wells. The pump and probe laser wavelengths are absorbed in spatially separated regions of the multilayer structure. The photoconductivity of a probe beam around 840 nm is confined to the GaAs quantum wells and cannot easily erase the trapped space-charge gratings in the AlGaAs barriers written by an above-band-gap HeNe laser at 633 nm. This allows a weak visible control beam to modulate a strong infrared signal beam.

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页码：2067 / 2069

页数：3

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