Title: Calculation of reflectance for double quantum well laser at both minimum dispersion and minimum attenuation spectra

Authors: Deyasi Arpan

Addresses: Department of Electronics and Communication Engineering, RCC Institute of Information Technology, Kolkata, India

Abstract: Double heterojunction laser is one of the better candidates under the umbrella of quantum well laser owing to its both carrier confinement and mode confinement capabilities. The major operational advantage it exhibits through intersubband transition between the minibands; and henceforth, bandwidth estimation of the reflectivity profile becomes crucial for theoretical engineers. This requires analysis of the reflectivity profile, and it critically depends on both material composition as well as operating spectrum. In the present paper, reflectivity of double quantum well laser is computed analytically based on the principle of Bragg grating, and corresponding full-width-at-half-maximum (FWHM) is evaluated. Peak reflectivity variation with both order no of the structure as well as grating period of both the operating windows are evaluated, and corresponding peak amplitude for every reflectivity profile is measured. Computation is carried out separately at both minimum dispersion and minimum attenuation windows, and result deals with a vis-à-vis comparative study based on their performance. Role of confinement factors and number of layers are taken into account for optimum performance.

Keywords: quantum cascade laser; reflectivity; FWHM; minimum attenuation; minimum dispersion; peak amplitude.

DOI: 10.1504/IJNP.2022.126394

International Journal of Nanoparticles, 2022 Vol.14 No.2/3/4, pp.92 - 105

Received: 12 Jul 2021
Accepted: 09 Feb 2022
Published online: 24 Oct 2022 *

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