Figure 1 | Scientific Reports

Figure 1

From: Quantum-dot micropillar lasers subject to coherent time-delayed optical feedback from a short external cavity

Figure 1

(a) Sketch of the micro-electroluminescence setup. The micropillar is kept at cryogenic temperatures (T = 32 K) inside a He-flow cryostat. The spectral properties are investigated with a grating spectrometer equipped with a CCD camera and Fabry-Perot interferometer (FPI) for increased spectral resolution. The photon statistics is characterized via two single-photon counting modules (SPCMs) which form a Hanbury Brown and Twiss (HBT) setup. A streak camera in synchronscan mode records the temporal response of the microlaser to an injected pulse from a tunable Ti:Sa laser. A long pass filter (LPF) in the external cavity suppresses feedback from the Ti:Sa pulse. (b) Scanning electron microscope image of the used mircopillar structures.

Back to article page