Dynamics of actively mode-locked Quantum Cascade Lasers

被引：44

作者：

Gkortsas, V. -M. ^{[1
,2
]}

Wang, C. ^{[3
]}

Kuznetsova, L. ^{[4
]}

Diehl, L. ^{[4
]}

Gordon, A. ^{[1
,2
]}

Jirauschek, C. ^{[5
]}

Belkin, M. A. ^{[3
]}

Belyanin, A. ^{[6
]}

Capasso, F. ^{[4
]}

Kaertner, F. X. ^{[1
,2
]}

机构：

[1] MIT, Dept Elect Engn & Comp Sci, Cambridge, MA 02139 USA

[2] MIT, Elect Res Lab, Cambridge, MA 02139 USA

[3] Harvard Univ, Dept Phys, Cambridge, MA 02138 USA

[4] Harvard Univ, Sch Engn & Appl Sci, Cambridge, MA 02138 USA

[5] Tech Univ Munich, Inst Nanoelect, Munich, Germany

[6] Texas A&M Univ, Dept Phys, College Stn, TX 77843 USA

来源：

OPTICS EXPRESS | 2010年 / 18卷 / 13期

关键词：

GENERATION; LOCKING; PULSES; WATER;

D O I：

10.1364/OE.18.013616

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The impact of upper state lifetime and spatial hole burning on pulse shape and stability in actively mode locked QCLs is investigated by numerical simulations. It is shown that an extended upper state lifetime is necessary to achieve stable isolated pulse formation per roundtrip. Spatial hole burning helps to reduce the pulse duration by supporting broadband multimode lasing, but introduces pulse instabilities which eventually lead to strongly structured pulse shapes that further degrade with increased pumping. At high pumping levels gain saturation and recovery between pulses leads to suppression of mode locking. In the absence of spatial hole burning the laser approaches single-mode lasing, while in the presence of spatial hole burning the mode locking becomes unstable and the laser dynamics does not reach a steady state anymore. (C) 2010 Optical Society America

引用

页码：13616 / 13630

页数：15

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