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HL: Fachverband Halbleiterphysik
HL 29: Poster II
HL 29.77: Poster
Dienstag, 18. März 2025, 18:00–20:00, P1
SUPER drived quantum dot at telecom wavelength — •Zenghui Jiang1, Vikas Remesh2, Frederik Benthin1, Michael Zopf1, and Fei Ding1 — 1Leibniz Universität Hannover, Institut für Festkörperphysik, Appelstraße 2, 30167 Hannover — 2Department of Experimental Physics University of Innsbruck Technikerstr. 25d, Office 01/503 6020 Innsbruck, Austria
To obtain the best photon properties from quantum dots (QDs),a direct drive between the S-shell and ground state (resonance excitation) is required. However, since the excitation laser and the emitted wavelength are very close to each other, filtering out the laser becomes highly challenging. A theoretical study conducted in 2021 by Prof. Doris Reiter's group predicted that with two relatively detuned laser pulses, full population inversion can still be achieved without interacting with other energy levels. Consequently, photon properties comparable to those achieved through resonance excitation can be expected.
To efficiently drive QDs, two temporally overlapping laser pulses with different frequencies are needed. Compared to using two separate lasers for "SUPER" excitation, employing a single laser with a pulse shaper eliminates the need for synchronization between two lasers. However, until now, no experiment using a single laser with a pulse shaper has been performed on telecom-wavelength QDs. In our work, we constructed a pulse shaper using a spatial light modulator to generate two sharply defined laser pulses from a single broadband laser pulse,and successfully *SUPER* excited QD at telecom wavelength.
Keywords: SUPER; Telecom; Quantum Dot