Ultrafast and widely tuneable vertical-external-cavity surface-emitting laser, mode-locked by a graphene-integrated distributed Bragg reflector
Abstract
We report a versatile and cost-effective way of controlling the unsaturated loss, modulation depth and saturation fluence of graphene-based saturable absorbers (GSAs), by changing the thickness of a spacer between SLG and a high-reflection mirror. This allows us to modulate the electric field intensity enhancement at the GSA from 0 up to 400%, due to the interference of incident and reflected light at the mirror. The unsaturated loss of the SLG-mirror-assembly can be reduced to0. We use this to mode-lock a VECSEL from 935 to 981nm. This approach can be applied to integrate SLG into various optical components, such as output coupler mirrors, dispersive mirrors, dielectric coatings on gain materials. Conversely, it can also be used to increase absorption (up to 10%) in various graphene based photonics and optoelectronics devices, such as photodetectors.
Keywords
Cite
@article{arxiv.1310.2132,
title = {Ultrafast and widely tuneable vertical-external-cavity surface-emitting laser, mode-locked by a graphene-integrated distributed Bragg reflector},
author = {C. A. Zaugg and Z. Sun and V. J. Wittwer and D. Popa and S. Milana and T. Kulmala and R. S. Sundaram and M. Mangold and O. D. Sieber and M. Golling and Y. Lee and J. H. Ahn and A. C. Ferrari and U. Keller},
journal= {arXiv preprint arXiv:1310.2132},
year = {2017}
}