Beam quality optimization of electrically pumped VECSELs for passive modelocking

W. P. Pallmann; M. Hoffmann; M. Miller; J. Baier; H. Moench; I. Dahhan; B. Witzigmann; M. Golling; Y. Barbarin; T. Südmeyer; U. Keller

doi:10.1117/12.873823

21 February 2011 Beam quality optimization of electrically pumped VECSELs for passive modelocking

W. P. Pallmann, M. Hoffmann, M. Miller, J. Baier, H. Moench, I. Dahhan, B. Witzigmann, M. Golling, Y. Barbarin, T. Südmeyer, U. Keller

Author Affiliations +

Proceedings Volume 7919, Vertical External Cavity Surface Emitting Lasers (VECSELs); 79190I (2011) https://doi.org/10.1117/12.873823
Event: SPIE LASE, 2011, San Francisco, California, United States

Abstract

Fundamental mode operation along with high output power is a major challenge for an electrically pumped VECSEL (EP-VECSEL) suitable for passive modelocking. We present an experimental study on the influence of the intermediate DBR reflectivity on the beam quality and the output power of EP-VECSELs. For designs with reflectivities of 90%, 82% and 71% the highest possible power for the best achievable beam quality was 15.1 mW (M² = 1.1, 82% device). We can demonstrate that a correctly chosen intermediate DBR reflectivity is necessary for both good beam quality and high power, and that a trade-off in power has to be accepted.

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W. P. Pallmann, M. Hoffmann, M. Miller, J. Baier, H. Moench, I. Dahhan, B. Witzigmann, M. Golling, Y. Barbarin, T. Südmeyer, and U. Keller "Beam quality optimization of electrically pumped VECSELs for passive modelocking", Proc. SPIE 7919, Vertical External Cavity Surface Emitting Lasers (VECSELs), 79190I (21 February 2011); https://doi.org/10.1117/12.873823

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