Ultrafast and widely tuneable vertical-external-cavity surface-emitting laser, mode-locked by a graphene-integrated distributed Bragg reflector

C. A. Zaugg, Z. Sun, V. J. Wittwer, D. Popa, S. Milana, T. S. Kulmala, R. S. Sundaram, M. Mangold, O. D. Sieber, M. Golling, Y. Lee, J. H. Ahn, A. C. Ferrari, U. Keller

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96 Citations (Scopus)

Abstract

We report a versatile 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 a single layer graphene (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 to ~0. We use this to mode-lock a vertical-external-cavity surface-emitting laser (VECSEL) from 935 to 981 nm. This approach can be applied to integrate SLG into various optical components, such as output coupler mirrors, dispersive mirrors or dielectric coatings on gain materials. Conversely, it can also be used to increase the absorption (up to 10%) in various graphene based photonics and optoelectronics devices, such as photodetectors.

Original languageEnglish
Pages (from-to)31548-31559
Number of pages12
JournalOptics Express
Volume21
Issue number25
DOIs
Publication statusPublished - 2013 Dec 16

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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    Zaugg, C. A., Sun, Z., Wittwer, V. J., Popa, D., Milana, S., Kulmala, T. S., Sundaram, R. S., Mangold, M., Sieber, O. D., Golling, M., Lee, Y., Ahn, J. H., Ferrari, A. C., & Keller, U. (2013). Ultrafast and widely tuneable vertical-external-cavity surface-emitting laser, mode-locked by a graphene-integrated distributed Bragg reflector. Optics Express, 21(25), 31548-31559. https://doi.org/10.1364/OE.21.031548