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21 February 2011 Beam quality optimization of electrically pumped VECSELs for passive modelocking
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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.
© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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);


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