Quantum dot cascade laser

Abstract

The invention discloses a quantum dot cascade laser, comprising a lower waveguide, a quantum dot active area layer and an upper waveguide. The quantum dot active area layer is of multi-period cascade, each period comprises multiple quantum wells / barriers and quantum dot intercalations, wherein the multiple quantum wells / barriers are used for regulating energy band structures so as to provide an electronic quantum conveying channel; and the quantum dot intercalations are used for realizing quantum dot participation sub-band lasing. In addition, a quantum well material of the quantum well / barrier is InxGa1-xAs, and x is larger than 0 and smaller than 1; and a quantum barrier material of the quantum well / barrier is InxAl1-yAs, and y is larger than 0 and smaller than 1. According to the quantum dot cascade laser disclosed by the invention, multiple quantum dot intercalations are guided to a suitable position in the quantum dot active area layer so that performance indexes of the quantum dot laser, such as power conversion efficiency, characteristic temperature and threshold density, are greatly improved.

Description

technical field [0001] The invention belongs to the technical field of semiconductor optoelectronics, and in particular relates to a quantum dot cascade laser, in particular to a quantum dot cascade laser with a quantum dot intercalation active region structure. Background technique [0002] Quantum cascade lasers (Quantum Cascade Lasers, QCLs), as a novel semiconductor coherent light source, are the product of the combination of "energy band engineering" and high-precision molecular beam epitaxy growth technology, and their wavelengths can cover environmental protection, communication and other fields Mid- and far-infrared bands with great application value. The core of QCLs, that is, the basic structure of the active region layer is composed of multiple thin layers of compound semiconductors with a thickness of several nanometers. With a sub-band or micro-band structure, electrons make radiative transitions between these discrete quantum states to constitute optical gain....

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem that the quantum dot cascade laser based on the strained self-organized growth quantum dot active region can not be lased yet, and some performance indicators of the traditional quantum well active region based quantum cascade laser are not high, it provides The invention provides a quantum dot cascaded laser with a quantum dot intercalation active region structure

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