Gain and luminescence spectra of broadband emitters based on asymmetric quantum-well heterostructures

Design and characteristics of widely tunable quantum-well laser diodes

“…The tuning range is determined by the width of the gain spectrum and hence it is rather narrow in these cases. Widening the gain spectrum is possible due to a novel conception of asymmetric quantum-well heterostructures where the potential profile in barrier regions and arrangement of differ active layers relative to current emitters play an essential role [9,10].…”

Calculation of gain and luminescence spectra of quantum-cascade laser structures taking into account asymmetric emission line broadening

“…Joining the functions at zero [C À F 1 (0) C F 2 (0)] and taking into account the normalisation condition (C À C 2), we can determine the C À and C coefécients. A combined model of the emission line broadening, in which, at the same broadening parameters, the proéle is described by a Lorentzian at DE`0 and by a Gaussian at DE b 0, was proposed in [6].…”

Effect of composition of barrier layers region on polarization radiation characteristics of quantum-well heterolaser

“…Laser radiation is known to be the combination of spontaneous and stimulated radiations. The intensity of spontaneous radiation is specified by the velocity of spontaneous transitions [6,7]:…”

“…where A cv is Einstein coefficient, d is the width of the quantum well, m rit = m c m vit /(m c + m vit ) is the reduced mass associated with the respective transversal components of the heavy or light holes (i = h, l), parameter α γ ni characterizes polarization dependence of the probability of the optical transitions and depends on the type of modes (TE or TM), levels involved (heavy or light holes), and transition energy E cv = E cni −E vni [6]; f e (E cni ) and f h (E vni ) are Fermi-Dirac distribution functions of the electrons and holes of the states E cni and E vni participating in the optical transitions [8]:…”