Membrane quantum well waveguide lasers

Klokkou, Nicholas, Richardson, Stephen C., Daykin, Jake, Woods, J. R. C., Gorecki, J., Bek, Roman, Jetter, Michael and Apostolopoulos, Vasilis (2024) Membrane quantum well waveguide lasers. Keller, Ursula (ed.) In Vertical External Cavity Surface Emitting Lasers (VECSELs) XIII. vol. PC12868, SPIE. p. 18 . (doi:10.1117/12.3004996).

Abstract

We study coherent laser arrays operating in epitaxially grown semiconductor membrane quantum wells. The samples are deposited by transfer on substrates of oxidized silicon and we record the real and reciprocal space of the laser emission. The Laser arrays are in a lateral emission geometry and are waveguides lasers where the end mirrors are the end-facets of the cleaved membranes which usually form cavities in the order of 100 microns. We are able to create waveguide laser arrays with modal widths of approximately 5-10 microns separated by 10-20 microns. We use real and reciprocal space imaging to examine the emission characteristics of the lasing cavity. Remarkably, we discover that the mutual coherence is preserved whether the cavity operates on a single longitudinal mode or multiple modes. We will show how their emission and coherence can be controlled using a digital micromirror device to control the position and shape of the pump illumination studying threshold, coherence and frequency.

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Contributors

Author: Nicholas Klokkou

Author: Stephen C. Richardson

Author: J. Gorecki

Author: Vasilis Apostolopoulos

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