An autocorrelator that is needed for the characterization of ultraviolet (UV) quantum light sources was funded by MAPEX
An autocorrelator records an approximation of the, so-called, g(2)-function. This function includes valuable information about the photon statistics of any light sources, enabling, e.g., the distinction of coherent, thermal, and single photon sources.
The upgrade includes: The autocorrelator is based on a low-noise, continuous-wave UV laser, a time-resolved photon counting unit with two UV-VIS (visible) light detectors, and a piezo mirror system for precise laser beam positioning.
Key benefits: From a worldwide perspective, the system is one of the very few detection systems for quantum light in the UV spectral range. Exactly this UV spectral range is of particular interest for secured inter-satellite data transmission in space. The system has a high quantum efficiency, which reduces data acquisition times.
Features: This UV autocorrelator is sensitive from around 230 – 700 nm, while its optimal optical detection window stretches from 230 – 550 nm. The applied detectors yield a biphoton time resolution of ≤ 220 ps. The low noise UV laser source in use has a wavelength of 266 nm, which enables the characterization of most UV single photon sources (e.g., based on quantum dots, point defects). Due to the acquired piezo mirror, this UV autocorrelator can automatically readjust itself, which is a key feature for longer acquisition times needed for pioneering materials. In addition, this feature enhances the usability of this setup for external users. Furthermore, conventional time-resolved photoluminescence studies (TRPL) can be performed on the basis of this UV autocorrelator.
Applied by:
Prof. Dr. Gordon Callsen
(Solid State Spectroscopy)
