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Proceedings Paper

Colliding pulse mode-locked VECSEL
Author(s): Declan Marah; Alexandre Laurain; Wolfgang Stolz; Stephan Koch; Antje Ruiz Perez; John McInerney; Jerome Moloney
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Paper Abstract

Recent development of high power femtosecond pulse modelocked VECSEL with gigahertz pulse repetition rates sparked an increased interest from the scientific community due to the broad field of applications for such sources, such as frequency metrology, high-speed optical communication systems or high-resolution optical sampling. To the best of our knowledge, we report for the first time a colliding pulse modelocked VECSEL, where the VECSEL gain medium and a semiconductor saturable absorber (SESAM) are placed inside a ring cavity. This cavity geometry provides both a practical and an efficient way to get optimum performance from a modelocked laser system. The two counter propagating pulses in our ring cavity synchronize in the SESAM because the minimum energy is lost when they saturate the absorber together. This stronger saturation of the absorber increases the stability of the modelocking and reduces the overall losses of the laser for a given intra-cavity fluence, leading to a lower modelocking threshold. This also allows the generation of fundamental modelocking at a relatively low repetition rate (<GHz) with a higher output power compared to conventional VECSEL cavity. We obtained a total output power of 2.2W with an excellent beam quality, a pulse repetition rate of 1GHz and a pulse duration ranging from 1ps to 3ps. The emitted spectrum was centered at 1007nm with a FWHM of 3.1nm, suggesting that shorter pulses can be obtained with adequate dispersion compensation. The laser characteristics such as the pulse duration and stability are studied in detail.

Paper Details

Date Published: 10 March 2016
PDF: 6 pages
Proc. SPIE 9734, Vertical External Cavity Surface Emitting Lasers (VECSELs) VI, 97340W (10 March 2016); doi: 10.1117/12.2212902
Show Author Affiliations
Declan Marah, Univ. College Cork (Ireland)
Alexandre Laurain, College of Optical Sciences, The Univ. of Arizona (United States)
Wolfgang Stolz, Philipps-Univ. Marburg (Germany)
Stephan Koch, Philipps-Univ. Marburg (Germany)
College of Optical Sciences, The Univ. of Arizona (United States)
Antje Ruiz Perez, Philipps-Univ. Marburg (Germany)
John McInerney, Univ. College Cork (Ireland)
College of Optical Sciences, The Univ. of Arizona (United States)
Jerome Moloney, College of Optical Sciences, The Univ. of Arizona (United States)


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

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