Laser Diodes with a Wide Flat Modal Gain Spectrum in the (1–3)- μm Range

The gain spectra of multilayer quantum-well heterostructures on the basis of GaInAs/GaInPAs and GaInAsSb/AlGaAsSb compounds have been analyzed. The possibility of implementing of wide and almost flat spectrum of modal gain in the near IR range upon inhomogeneous excitation of quantum wells in such compounds is shown

High - Temperature Superconductivity in Iron Based Layered Compounds

We present a review of basic experimental facts on the new class of high - temperature superconductors - iron based layered compounds like REOFeAs (RE=La,Ce,Nd,Pr,Sm...), AFe_2As_2 (A=Ba,Sr...), AFeAs (A=Li,...) and FeSe(Te). We discuss electronic structure, including the role of correlations, spectrum and role of collective excitations (phonons, spin waves), as well as the main models, describing possible types of magnetic ordering and Cooper pairing in these compounds.Comment: 43 pages, 30 figures, review talk on 90th anniversary of Physics Uspekh

Laser Diodes with a Wide Flat Modal Gain Spectrum in the (1–3)- μm Range

The gain spectra of multilayer quantum-well heterostructures on the basis of GaInAs/GaInPAs and GaInAsSb/AlGaAsSb compounds have been analyzed. The possibility of implementing of wide and almost flat spectrum of modal gain in the near IR range upon inhomogeneous excitation of quantum wells in such compounds is shown