Regensburg 2016 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 5: Quantum Dots and Wires: Single Photon Sources
HL 5.5: Vortrag
Montag, 7. März 2016, 11:15–11:30, H15
Single-photon emission at a rate of 143 MHz from deterministic quantum-dot microlenses triggered by a mode-locked VECSEL — •Alexander Schlehahn1, Mahmoud Gaafar2, Max Vaupel2, Manuel Gschrey1, Peter Schnauber1, Jan-Hindrik Schulze1, Sven Rodt1, André Strittmatter1, Wolfgang Stolz2, Arash Rahimi-Iman2, Tobias Heindel1, Martin Koch2, and Stephan Reitzenstein1 — 1Institut für Festkörperphysik, Technische Universität Berlin, 10623 Berlin, Germany — 2Department of Physics and Material Sciences Center, Philipps-Universität Marburg, 35032 Marburg, Germany
We report on the realization of an ultra-bright quantum-dot (QD) based single-photon source. The source consists of a deterministic QD microlens and is excited by a mode-locked vertical-external-cavity surface-emitting laser (ML-VECSEL). The frequency-doubled ML-VECSEL operates at a wavelength of 508 nm and features pulse widths of 4.2 ps at a repetition rate of 494 MHz, being about 6 times faster than conventional Ti:sapphire lasers. This unique and compact combination allows us to achieve single-photon fluxes of (143 ± 16) MHz collected by the first lens of the setup, corresponding to a photon-extraction efficiency of (29 ± 3) % with g(2)(0) below 0.03 [1]. Beyond this proof of principle under non-resonant excitation, our concept is perfectly suited for the application of resonant excitation schemes using wavelength-tunable ML-VECSELs and spectrally matched QDs to generate indistinguishable single photons at high rates.
[1] A. Schlehahn et al., Appl. Phys. Lett. 107, 041105 (2015)