Optical external efficiency of terahertz quantum cascade laser based on Cerenkov difference frequency generation

被引：2
|
作者：
Hamadou, A. [1 ,4 ]
Thobel, J-L [2 ]
Lamari, S. [3 ,4 ]
机构：
[1] Univ Mohamed Elbachir Elibrahimi, Fac Sci & Technol, Dept Genie Civil, Bordj Bou Arreridj 34000, Algeria
[2] Univ Lille 1, Inst Elect Microelect & Nanotechnol IEMN, UMR 8520, Ave Poincare,BP 60069, F-59652 Villeneuve Dascq, France
[3] Univ Ferhat Abbas Setif 1, Fac Sci, Dept Phys, Setif 19000, Algeria
[4] Lab Etud Surfaces & Interfaces Mat Solides LESIMS, Setif 19000, Algeria
来源：
JOURNAL OF NONLINEAR OPTICAL PHYSICS & MATERIALS | 2019年 / 28卷 / 04期
关键词：
Terahertz quantum cascade laser; difference frequency generation; optical external efficiency; Cerenkov; phased matching;
D O I：
10.1142/S021886351950036X
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
In this paper, we consider terahertz sources based on Cerenkov difference frequency generation in a dual-wavelength mid-infrared quantum cascade laser and calculate analytically the optical external efficiency of the out-going terahertz wave. The mid-infrared pumps operate simultaneously and have a common upper level. For short cavity lengths and low terahertz losses in the substrate, we find that implementation of the Cerenkov emission scheme in terahertz difference frequency generation quantum cascade lasers improves the optical external efficiency dramatically. The maximum value of the latter is close to 19%, but is only attainable if the laser exhibits negligible mid-infrared transmission losses.
引用
收藏
页数：15
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