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High power single mode quantum cascade lasers with a narrow far field are important for several applications including surgery or military countermeasure. Existing technologies suffer from drawbacks such as operation temperature and scalability. In this paper we introduce a fabrication approach that potentially solves simultaneously these remaining limitations. We demonstrate and characterize deep...
We introduce a successful double metal Terahertz (THz) Quantum Cascade Laser (QCL) meant for astrophysical heterodyne measurement. The laser ridge is embedded in Benzocyclobutene (BCB) and works in continuous wave operation, emitting monochromatic light around 4.745 THz with a peak power of almost 1.8 mW at 10 K and a power consumption of ∼1.6 W. Moreover, thanks to the integration of a top metal...
We investigate the functionalities of dual-section (DS) distributed feedback (DFB) quantum cascade lasers (QCLs) in continuous wave (CW) and intermittent continuous wave (iCW) operation. We analyze internal etaloning with spectrally resolved light-current-voltage characterization, time-resolved spectral analysis of thermal chirping during iCW operation. The experimental analysis is accompanied by...
We present the first realization of a single-mode surface-emitting quantum cascade laser array. The ten lasers operate over a bandwidth of 175 cm−1 between wavelengths of 8 and 10 μm and show similar pumping characteristics. The device is compatible with milliwatt continuous wave operation, which makes it suitable for spectroscopic applications.
Recent demonstrations of light emission from group IV materials such as Ge and its alloy with Sn renew the vision for the realization of an all group IV based opto-electronic platform. We compare some of these approaches to our strain method and mention rewarding research to further improve materials and concepts.
Surface emitting semiconductor lasers in the terahertz frequency range are highly demanded for spectroscopy, imaging, security and other applications. Due to their compactness and high power, Quantum Cascade Lasers (QCLs) are one of the most important laser sources in this region. The selection rule of intersubband transitions forces the radiation to be TM polarized and thus generated in-plane, consequently...
We theoretically and experimentally investigate a band edge Photonic Crystal (PhC) Quantum Cascade Laser (QCL) operating at 3.1 THz. The surface emission is achieved by using a second-order Bragg grating at the PhC tile boundaries. Highly directional surface emitting far-field patterns are observed.
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