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4 March 2019 Investigations on the origins of self-mode-locking in vertical-external-cavity surface-emitting-lasers: nonlinear lensing and the role of the microcavity
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Abstract
Ultra-short pulse generation with saturable-absorber-free vertical-external-cavity surface-emitting-lasers (VECSELs) has raised significant interest in recent years due to the promises it holds for further peak-power scaling and cost-efficiency as well as for the design of more flexible, compact and simpler cavities. Although demonstrated for various devices, the self-mode-locking phenomenon in VECSELs still lacks a consistent explanation. Here, nonlinear lensing in a VECSEL gain chip as a possible mode-locking mechanism, directly measured via Z-scans at laser-relevant wavelengths, and the role of the microcavity resonance on the strength and dispersion of the Kerr nonlinearity are discussed. Furthermore, the impact on self-mode-locking is considered.
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Christian Kriso, Sascha Kress, Tasnim Munshi, Marius Großmann, Roman Bek, Michael Jetter, Peter Michler, Wolfgang Stolz, Martin Koch, and Arash Rahimi-Iman "Investigations on the origins of self-mode-locking in vertical-external-cavity surface-emitting-lasers: nonlinear lensing and the role of the microcavity", Proc. SPIE 10901, Vertical External Cavity Surface Emitting Lasers (VECSELs) IX, 109010H (4 March 2019); https://doi.org/10.1117/12.2510373
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