3 March 2014 Graphene saturable absorbers for VECSELs
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We report mode-locking of an optically pumped VECSEL using a graphene-based saturable absorber mirror (GSAM). Self-starting and stable modelocked operation is demonstrated with 473 fs pulses at 1.5 GHz repetition rate and 949 nm center wavelength. Wavelength tuning is achieved over a 46 nm bandwidth. We discuss the mirror design, the fabrication of the GSAMs, and give an outlook on further optimization of the design, including dielectric top coatings to protect the graphene and to increase the flexibility in the design.
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V. J. Wittwer, V. J. Wittwer, C. A. Zaugg, C. A. Zaugg, Z. Sun, Z. Sun, D. Popa, D. Popa, S. Milana, S. Milana, T. S. Kulmala, T. S. Kulmala, R. S. Sundaram, R. S. Sundaram, M. Mangold, M. Mangold, M. Golling, M. Golling, Y. Lee, Y. Lee, J. H. Ahn, J. H. Ahn, U. Keller, U. Keller, A. C. Ferrari, A. C. Ferrari, "Graphene saturable absorbers for VECSELs", Proc. SPIE 8966, Vertical External Cavity Surface Emitting Lasers (VECSELs) IV, 89660X (3 March 2014); doi: 10.1117/12.2039111; https://doi.org/10.1117/12.2039111

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