Gain recovery dynamics of a terahertz quantum cascade laser

被引：27
|
作者：
Green, Richard P. [1 ,2 ,3 ]
Tredicucci, Alessandro [1 ,2 ]
Vinh, Ngui Q. [4 ]
Murdin, Ben [5 ]
Pidgeon, Carl [6 ]
Beere, Harvey E. [7 ]
Ritchie, David A. [7 ]
机构：
[1] CNR, NEST, INFM, I-56126 Pisa, Italy
[2] Scuola Normale Super Pisa, I-56126 Pisa, Italy
[3] Univ Glasgow, Dept Elect & Elect Engn, Glasgow G12 8LT, Lanark, Scotland
[4] Inst Plasma Phys Rijnhuizen, FOM, FELIX Free Electron Laser Facil, NL-3430 BE Nieuwegein, Netherlands
[5] Univ Surrey, Adv Technol Inst, Guildford GU2 7XH, Surrey, England
[6] Heriot Watt Univ, Dept Phys, Edinburgh EH14 4AS, Midlothian, Scotland
[7] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England
来源：
PHYSICAL REVIEW B | 2009年 / 80卷 / 07期
基金：
英国工程与自然科学研究理事会;
关键词：
SEMICONDUCTOR SUPERLATTICES; OSCILLATION;
D O I：
10.1103/PhysRevB.80.075303
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The gain recovery time of a bound-to-continuum terahertz quantum cascade laser is measured using a stimulated emission photocurrent technique. At low temperatures a value similar to 50 ps is found. This tends to decrease with rising temperature, and suggests that class B laser dynamics should be expected from these devices. Both the value and the trend in the gain recovery time are found to be consistent with hopping transport through the miniband. Power-dependent measurements of the photocurrent clearly show the effects of inhomogeneous broadening of the gain transition.
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页数：5
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