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Proceedings Paper

Pulse shortening of an ultrafast VECSEL
Author(s): D. Waldburger; C. G. E. Alfieri; S. M. Link; E. Gini; M. Golling; M. Mangold; B. W. Tilma; U. Keller
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Paper Abstract

Ultrafast, optically pumped, passively modelocked vertical external-cavity surface-emitting lasers (VECSELs) are excellent sources for industrial and scientific applications that benefit from compact semiconductor based high-power ultrafast lasers with gigahertz repetition rates and excellent beam quality. Applications such as self-referenced frequency combs and multi-photon imaging require sub-200-fs pulse duration combined with high pulse peak power. Here, we present a semiconductor saturable absorber mirror (SESAM) modelocked VECSEL with a pulse duration of 147 fs and 328 W of pulse peak power. The average output power was 100 mW with a repetition rate of 1.82 GHz at a center wavelength of 1034 nm. The laser has optimal beam quality operating in a fundamental transverse mode with a M2 value of <1.05 in both orthogonal directions. The VECSEL was grown by metal-organic vapor phase epitaxy (MOVPE) with five pairs of strain-compensated InGaAs quantum wells (QWs). The QWs are placed symmetrical around the antinodes of the standing electric field at a reduced average field enhancement in the QWs of ≈ 0.5 (normalized to 4 outside the structure). These results overcome the trade-off between pulse duration and peak power of the state-of-the-art threshold values of 4.35 kW peak power for a pulse duration of 400 fs and 3.3 W peak power for a pulse duration of 107 fs.

Paper Details

Date Published: 10 March 2016
PDF: 8 pages
Proc. SPIE 9734, Vertical External Cavity Surface Emitting Lasers (VECSELs) VI, 973409 (10 March 2016); doi: 10.1117/12.2209251
Show Author Affiliations
D. Waldburger, ETH Zürich (Switzerland)
C. G. E. Alfieri, ETH Zürich (Switzerland)
S. M. Link, ETH Zürich (Switzerland)
E. Gini, ETH Zürich (Switzerland)
M. Golling, ETH Zürich (Switzerland)
M. Mangold, ETH Zürich (Switzerland)
B. W. Tilma, ETH Zürich (Switzerland)
U. Keller, ETH Zürich (Switzerland)

Published in SPIE Proceedings Vol. 9734:
Vertical External Cavity Surface Emitting Lasers (VECSELs) VI
Keith G. Wilcox, Editor(s)

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