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By introducing side-absorbers to metal-metal waveguides of broadband terahertz quantum cascade lasers, we are able to control and completely suppress higher-order lateral waveguide modes. This change leads to an octave spanning laser spectrum with a 600 GHz wide flat top. In addition, the absence of higher order lateral modes has a strong effect on the pulse generation of injection seeded QCLs. We...
We report on a monolithic extracting structure for terahertz quantum cascade laser based frequency combs. For a spectral bandwidth of more than 600 GHz at a center frequency of 2.5 THz a frequency comb with well-defined farfield pattern could be achieved. In addition the dynamic range of the frequency comb has been significantly improved.
Frequency noise and linewidth properties of different mid-infrared DFB-QCLs using buried-heterostructures and ridge waveguides are compared. The physical origin of frequency noise and the impact of the different lasers parameters are discussed.
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.
The quantum cascade laser (QCL) is a semiconductor laser that employs radiative transitions of an electron between the bounded states in a superlattice (SL) and phenomenon of resonant tunnelling. Here we present a QCL that operates in the terahertz (THz) spectral region at wavelength of 95 mum.The presented device is based on four quantum well design with spatially diagonal radiative transition and...
We present the use of a third order distributed feedback waveguide for double metal THz quantum cascade laser as a successful design to obtain high slope efficiency of 50 mW/A, spectral emission control and narrow single lobed far field (5degtimes 8deg).
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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