Essays about: "QCL"

Showing result 6 - 9 of 9 essays containing the word QCL.

  1. 6. A Measurement Platform for Characterization of Quantum Cascade Lasers

    University essay from KTH/Skolan för informations- och kommunikationsteknik (ICT)

    Author : Joakim Storck; [2016]
    Keywords : ;

    Abstract : A measurement platform has been built to characterize quantum cascade lasers regrown at KTH by measuring their spectral and electrical properties at room temperature. Since the current source used in this work had a compliance voltage which was too low to get above threshold, an adapter was made to put an external voltage source in series with it, raising the voltage over the laser. READ MORE

  3. 7. Interface Roughness in Quantum Cascade Lasers

    University essay from Lunds universitet/Matematisk fysik

    Author : Kasparas Antanas Krivas; [2015]
    Keywords : Quantum Cascade Lasers; Interface Roughness; Modeling; Physics and Astronomy;

    Abstract : The quantum cascade laser (QCL) is a solid state device capable of generating the coherent mid-infrared and terahertz radiation. It is made from layers of different semiconducting materials. This layered structure gives rise to sub-bands, that are employed to achieve charge inversion necessary for lasing. READ MORE

  4. 8. Nonlinear response of a quantum cascade laser in a high intensity electromagnetic field

    University essay from Lunds universitet/Fysiska institutionen; Lunds universitet/Matematisk fysik

    Author : David Winge; [2012]
    Keywords : quantum cascade laser; QCL; nonlinear response; green s functions; gain clamping; Physics and Astronomy;

    Abstract : A theoretical study is presented, in which the nonlinear response of a bi-ased Quantum Cascade Laser (QCL) is calculated. The calculations are based on the nonequilibrium Green’s function formalism. READ MORE

  5. 9. Analysis and optimasation of quantum cascade structures

    University essay from Lunds universitet/Fysiska institutionen; Lunds universitet/Matematisk fysik

    Author : Martin Lindskog; [2012]
    Keywords : quantum cascade laser; QCL; quantum cascade detector; QCD; laser; Green s function theory; non-equilibrium; terahertz; solid state physics; optical gain; semiconductor; heterostructure; Physics and Astronomy;

    Abstract : The quantum cascade laser (QCL) is a semiconductor heterostruc- ture using inter sub-band transitions to generate stimulated emission. The quantum cascade detector (QCD) is a similar to the QCL, but the heterostructure is tailored to absorb radiation and give a read-out current. READ MORE