Abstract-Design and simulation of terahertz GaAs/AlGaAs quantum cascade laser for higher power performance

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• Ali Asghar Khorami^a, b, , , 
• Ali Riahi^a, 
• Mohsen Ghahramani^a, 
• Pedram Bazvand^a

• ^a Research Institute for Laser & Optics, University of Imam Hossein, Tehran 16585-179, Iran
• ^b School of Engineering, Department of Nanoelectronics, Tarbiat Modares University, 14115-143 Tehran, Iran

Received 12 January 2015, Accepted 26 October 2015, Available online 10 November 2015

http://www.sciencedirect.com/science/article/pii/S0030402615014965

Terahertz (THz) quantum cascade lasers (QCLs) emit radiation due to intersubband optical transitions that could be engineered by design. In this paper, in an effort to improve the output power of THz QCLs, the new active-region design based on diagonal transitions is designed and simulated. The results, obtained from self-consistent solutions of the Schrödinger and Poisson equations, show that this design has better performance rather than reported previous works, and the output power of this device can be further improved to produce milliwatts of terahertz radiation at higher temperatures.