New concepts for short-wavelength quantum cascade lasers and few-cycle THz emitters
New concepts for short-wavelength quantum cascade lasers and few-cycle THz emitters
Helm, M.
I will discuss two recent advances related to semiconductor light sources in the infrared and THz regions. One example is a quantum cascade laser operating at a wavelength shorter than 4 microns above room temperature with high peak power. It is based on strained InGaAs/InAlAs on InP, with the addition of high barriers of pure AlAs for better confinement and strain compensation. In a novel few-cycle THz emitter we try to combine the advantages of the high electric bias field in photoconductive antennas with a large active area. This is achieved with an interdigitated electrode structure, partially covered in order to mask one field polarity. As a result no destructive interference of the emitted THz wave occurs, which allows upscaling of the device area.
Keywords: THz emitter; quantum cascade laser
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Invited lecture (Conferences)
Japan-Germany Colloquium 2005: Semiconductor Physics and Technology, 14.-16.02.2005, Dresden, Deutschland
Permalink: https://www.hzdr.de/publications/Publ-7148