Design and characteristics of widely tunable quantum-well laser diodes

Abstract

Light-current and tuning characteristics of semiconductor injection lasers in an external cavity are analyzed. The active region of the lasers is an asymmetric multiple quantum-well heterostructure under conditions of non-uniform excitation. Such a design of laser diodes results in a wide range tunable emission spectrum.

Production of broadband modal gain spectra in asymmetric multiple quantum-well Ga0.47In0.53As/Ga0.18In0.82As0.4P0.6heterostructures

“…Note that, as the pump current is increased, the gain spectrum transforms and its maximum shifts in the shortwavelength region from 1.25 to 1.35 mm due to increasing population mainly in narrow quantum wells, so that the gain in the long-wavelength region between 1.5 and 1.6 mm increases much slower. A similar behaviour of the total modal gain was observed for asymmetric multiple quantumwell GaAs heterostructures [5].…”

“…The idea of nonuniform excitation of quantum wells in GaAs/Al x Ga 1Àx As compounds was proposed in [5,6], where the broadband gain spectrum was obtained in the wavelength range between 0.79 and 0.85 mm. It was shown that the emission wavelength of interband transitions in quantum-well lasers depends on the thickness of active layers.…”

Self-consistent calculations of the energy and tunable emission spectra of doping superlattices

“…Tuning curves are calculated for laser diodes which wavelength of the emission is selected in the external cavity, such as the Littman and Metcalf configuration. 10 Trace gas detection with similar tunable sources is easily provided with a multipass cell. 11 The calculation procedure of the tuning curves includes the determination of the sheet photon density S in the active region of the laser source.…”

<title>Temperature dependence of the threshold and Auger recombination in asymmetric quantum-well heterolasers</title>

“…A plausible way for solving this problem can be application of the semiconductor lasers based on asymmetric quantum-well heterostructures [2] . These laser heterostructures can serve as broadband light sources for multi-channel fiber-optical network systems [3].…”