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Recent progress in the design and realization of quantum cascade lasers emitting at THz frequencies will be discussed. High temperature and high power operation are reported and broadband emitters are discussed. THz lasers oscillating in micro-resonators with extremely small modal volumes will be also presented.
A THz quantum cascade structure has been designed to allow population relaxation between crossing Landau levels from different subbands under perpendicular magnetic field. Electroluminescence measurements show intersubband luminescence as well as inter-Landau level emission (cyclotron emission).
Intense terahertz emitters are one of the most important components of terahertz (THz) time-domain spectroscopy systems. In this presented report, the development of THz emitters over the last two decades is reviewed, and an outlook for future THz emitters is given. The physical principle behind the THz generation process is discussed for two types of emitters: state-of-the-art large-area photoconductive...
This paper presents a new concept for the generation of terahertz (THz) radiation. Instead of accelerating carriers in an external bias field as state-of-the-art THz emitters generate THz radiation, the THz radiation is generated by lateral Photo-Dember currents induced by inhomogeneous optical excitation. The principle is proven in the simplest geometry on GaAs.
We present a terahertz quantum cascade laser based on InGaAs/InAlAs/InP material system with double metal waveguide that reaches operating temperature of 123 K with continuous wave power output 4.5 mW at 10 K and slope efficiency comparable to GaAs/AlGaAs counterparts.
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