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Mode-locked Vertical External-Cavity Surface-Emitting Lasers (ML-VECSELs) have seen advances in pulse energy and peak power thanks to improved power handling techniques and structure designs. The significant increase in gain and intra-cavity power, coupled with the VECSEL's accessible external-cavity, has made the addition of intra-cavity elements for frequency conversion possible even for lossy conversion mechanisms. In this paper, we report a gold-patterned Semiconductor Saturable Absorbing Mirror (SESAM) that functions both as a slow saturable absorber in a ML-VECSEL and as an intracavity strip line Photo-Conductive Antenna (PCA) for THz emission. Here we describe the design of the strip emitter, THz-Time Domain Spectroscopy (TDS) performed with a ML-Yb fibre laser and the mode-locked characterisation of a ML-VECSEL built with the patterned SESAM.
T. Chen Sverre,A. P. Turnbull,P. C. Gow,E. Mavrona,J. R. C. Woods,C. R. Head,V. Apostolopoulos, andA. C. Tropper
"Mode-locked VECSEL SESAM with intracavity antenna for terahertz emission", Proc. SPIE 10087, Vertical External Cavity Surface Emitting Lasers (VECSELs) VII, 100870O (22 February 2017); https://doi.org/10.1117/12.2252346
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T. Chen Sverre, A. P. Turnbull, P. C. Gow, E. Mavrona, J. R. C. Woods, C. R. Head, V. Apostolopoulos, A. C. Tropper, "Mode-locked VECSEL SESAM with intracavity antenna for terahertz emission," Proc. SPIE 10087, Vertical External Cavity Surface Emitting Lasers (VECSELs) VII, 100870O (22 February 2017); https://doi.org/10.1117/12.2252346