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Sökning: WFRF:(Belkin Mikhail A.)

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1.
  • Oberhausen, Wolfhard, et al. (författare)
  • Phase-matching in terahertz quantum cascade laser sources based on Cherenkov difference-frequency mixing
  • 2023
  • Ingår i: APL Photonics. - : AIP Publishing. - 2378-0967. ; 8:9
  • Tidskriftsartikel (refereegranskat)abstract
    • Terahertz quantum cascade laser sources based on intra-cavity Cherenkov difference-frequency generation in dual-wavelength mid-infrared quantum cascade lasers are currently the only monolithic semiconductor laser technology that can deliver continuous-wave coherent terahertz output at room temperature. Because the Cherenkov difference-frequency generation process enables terahertz radiation generation and extraction across a wide range of frequencies, it is often assumed that phase-matching conditions for this process are automatically fulfilled. We theoretically analyze and experimentally demonstrate that phase-matching plays an important role in these devices, and significant improvements in terahertz power output can be achieved by adjusting the waveguide configuration of the quantum cascade lasers to provide better phase-matching.
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2.
  • Wacker, Andreas, et al. (författare)
  • Simulating Quantum Cascade Lasers: The Challenge to Quantum Theory
  • 2023
  • Ingår i: Mid-Infrared and Terahertz Quantum Cascade Lasers. - 9781108427937 - 9781108552066 ; , s. 153-172
  • Bokkapitel (refereegranskat)abstract
    • Quantum cascade lasers provide a variety of challenges to theory, which are outlined in this review: (i) The choice of basis states is discussed, where energy eigenstates are badly defined if the full periodic structure is considered. (ii) The tunneling through barriers requires a treatment of quantum coherences, which sets particular demands on the formulation of the quantum kinetic equations. Here the advantages and disadvantages of different approaches such as rate equations, Monte-Carlo simulations, different density matrix approaches, and Green’s functions methods are addressed. (iii) The evaluation of gain is detailed, where broadening is of utmost importance. (iv) An overview regarding the electrical instabilities of the extended structure due to domain formation is given, which strongly affect the overall performance.
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