DFB lasers with apodized surface gratings for wavelength stabilization and high efficiency. (27th June 2017)

• Record Type: Journal Article
• Authors: Fricke, J; Decker, J; Maaßdorf, A; Wenzel, H; Erbert, G; Knigge, A; Crump, P
• Is Part Of: Superconductor science & technology. Volume 32:Number 7(2019:Jul.)
• Publication Date: 2017-06-27
• Subjects: laser diode -- Bragg grating -- DFB laser -- wavelength stabilization; Superconductivity -- Periodicals; Superconductors -- Periodicals; 537.623
• DOI: 10.1088/1361-6641/aa715c
• Languages: English
• ISSNs: 0953-2048

Abstract

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 = 30 μ m and resonator length L = 6 mm 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.