Femtosecond measurements of near-infrared pulse induced mid-infrared transmission modulation of quantum cascade lasers

被引：4

作者：

Cai, Hong ^{[1
,2
]}

Liu, Sheng ^{[1
,2
]}

Lalanne, Elaine ^{[2
]}

Guo, Dingkai ^{[2
,3
]}

Chen, Xing ^{[2
,3
]}

Wang, Xiaojun ^{[4
]}

Choa, Fow-Sen ^{[2
,3
]}

Johnson, Anthony M. ^{[1
,2
,3
]}

机构：

[1] Univ Maryland Baltimore Cty, Dept Phys, Baltimore, MD 21250 USA

[2] Univ Maryland Baltimore Cty, CASPR, Baltimore, MD 21250 USA

[3] Univ Maryland Baltimore Cty, Dept CSEE, Baltimore, MD 21250 USA

[4] AdTech Opt Inc, City Of Industry, CA 91748 USA

来源：

APPLIED PHYSICS LETTERS | 2014年 / 104卷 / 21期

关键词：

D O I：

10.1063/1.4880358

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We temporally resolved the ultrafast mid-infrared transmission modulation of quantum cascade lasers (QCLs) using a near-infrared pump/mid-infrared probe technique at room temperature. Two different femtosecond wavelength pumps were used with photon energy above and below the quantum well (QW) bandgap. The shorter wavelength pump modulates the mid-infrared probe transmission through interband transition assisted mechanisms, resulting in a high transmission modulation depth and several nanoseconds recovery lifetime. In contrast, pumping with a photon energy below the QW bandgap induces a smaller transmission modulation depth but much faster (several picoseconds) recovery lifetime, attributed to intersubband transition assisted mechanisms. The latter ultrafast modulation (>60 GHz) could provide a potential way to realize fast QCL based free space optical communication. (C) 2014 AIP Publishing LLC.

引用

页数：4

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