High Throughput Single Photon Detection for effective SII

          @misc{ scivideos_PIRSA:24100101,
            doi = {10.48660/24100101},
            url = {https://pirsa.org/24100101},
            author = {Leopold, Verena},
            keywords = {Cosmology},
            language = {en},
            title = {High Throughput Single Photon Detection for effective SII},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2024},
            month = {oct},
            note = {PIRSA:24100101 see, \url{https://scivideos.org/pirsa/24100101}}
          }
          

Abstract

In this talk we want to promote a new kind of single photon detector able to record high count rates with the prospect of making stellar intensity interferometry (SII) measurements more effective. This micro-channel plate based photomultiplier tube from Photonscore (LINPix) is nearly dead time free and offers an active area of 8mm diameter. By choosing a matching photocathode, the quantum efficiency (QE) can take values greater than 30% at the desired wavelength. Using a Hi-QE Blue photocathode in a testbench featuring a fs-pulsed laser we were able to measure the timing resolution of the LINPix at different count rates from 190kHz up to 95 MHz. We find that the timing resolution of the detector only increases marginally when increasing the laser power and stays well below 100ps. Hence, we conclude that together with the LINTag, a suitable time to digital converter from Photonscore able to process the high throughput, this system can contribute significantly to the further development of SII.