|
Lasers
Theoretical analysis of profiled quantum-well laser structures
P. G. Eliseev, R. F. Nabiev, A. I. Onishchenko P. N. Lebedev Physical Institute, Russian Academy of Sciences, Moscow
Abstract:
The energy spectrum and transition matrix elements are investigated for a heterostructure laser with an ultra-thin active layer whose thickness is modulated in at least one direction. It is shown that, depending on the depth of the spatial modulation, the density-of-states distribution for such structures has peaks and valleys. This distribution is a transitional case between the spectrum of a one-dimensional quantum well and the spectrum of an array of parallel quantum wires or of a two-dimensional array of quantum dots (in the case of a two-dimensional spatial modulation). Proper choice of the parameters of a profiled structure can result in advantages over the usual quantum-well structure: a peak in the spectrum fixes the laser wavelength and increases the differential gain within a pump-current interval of practical interest, while a valley in the density of states weakens the temperature dependence of the threshold current. The matrix element of the working transitions in a quantum-well structure depends weakly on the quasimomentum in the periodic field, while the forbidden transitions are rather weak compared to the working transitions.
Received: 16.07.1992
Citation:
P. G. Eliseev, R. F. Nabiev, A. I. Onishchenko, “Theoretical analysis of profiled quantum-well laser structures”, Kvantovaya Elektronika, 20:1 (1993), 31–38 [Quantum Electron., 23:1 (1993), 26–32]
Linking options:
https://www.mathnet.ru/eng/qe2930 https://www.mathnet.ru/eng/qe/v20/i1/p31
|
Statistics & downloads: |
Abstract page: | 104 | Full-text PDF : | 55 |
|