Optical Characterization at Cryo-T
@ Solid State Physics group

Te Solid State Physics Group manages a state-of-the-art optical cryostat for the characterization of quantum emitters at low temperatures. The recirculating-liquid-He cryostat allows controlling the temperature with a thermal stability of <10 mK across a range of 3.8-350 K via a PC interface. The above-mentioned temperature range can be scanned over a minimum time of 5 minutes. Stabilization time for any specific temperature across this range is typically 30 s. The sample chamber is under high vacuum and equipped with 5 double-window ports for optical access, allowing for the implementation of temperature-dependent characterization of quantum light emitters, including confocal single-photon-sensitive photoluminescence, auto-correlation measurements in single-photon emission regime, and optically-detected magnetic resonance with MW source. The sample is mounted on a PC-controlled piezoeletric stage with 5 mm travel distance and 50 nm accuracy over a 2 µm fine positioning range, allowing for luminescence mapping along the three spatial axes. Laser excitation sources at 405 nm, 488 nm, 520 nm, 561 nm and 660 nm wavelengths are fiber-light coupled to a 100x objective, allowing for diffraction-limited confocal imaging.