DFB lasers with apodized surface gratings for wavelength stabilization and high efficiency
J. Fricke, J. Decker, A. Maaßdorf, H. Wenzel, G. Erbert, A. Knigge and P. Crump
Published in:
Semicond. Sci. Technol., vol. 32, no. 7, pp. 075012 (2017).
Abstract:
We present results of GaAs-based distributed-feedback (DFB) broad-area (BA) lasers with integrated surface-etched gratings. Lasers with longitudinally varying (apodized) Bragg gratings are compared to lasers with uniform gratings. DFB-BA lasers with apodized gratings show improved conversion efficiency and output power compared to those with uniform gratings. DFB-BA lasers with narrow contact stripe width W = 30µm and resonator length L = 6mm show a peak conversion efficiency of 60% and maintain efficiency >50% to an output power of >6 W. The spectral FWHM linewidth is below 0.5 nm. Furthermore DFB lasers with implemented apodized gratings are less sensitive to fabrication tolerances.
Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik, Gustav-Kirchhoff-Str. 4, 12489 Berlin, Germany
Keywords:
laser diode, Bragg grating, DFB laser, wavelength stabilization.
Copyright © 2017 IOP Publishing Ltd. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IOP Publishing Ltd.
Full version in pdf-format.