Quantum Efficiency of Single Photon Avalanche Diode (SPAD).
Abstract
Observation of faint sources is affected by the chronic problem of photon lack. This problem becomes crucial when very short integration times are required (from micro to milliseconds), as for example in observations of transient phenomena and adaptive optics to correct in real time the atmospheric turbulence. To detect weak and fast transients, CCDs are inadequate because of the readout noise and the readout technique, while SPADs detectors benefiting from the photon counting operating mode, can perform much better. SPAD detectors are very innovative and will offer further opportunities in astrophysical observations. The electro-optical characteristics of these devices are important to prove the applicability of the above cited scientific programs. At COLD laboratory of INAF Osservatorio Astrofisico of Catania several SPAD characterization campaigns have been carried-out. To measure the SPAD QE two different methodologies have been used, one classic and one by using a different approach. We will discuss both methodologies, the related equipment and the obtained results.
- Publication:
-
Memorie della Societa Astronomica Italiana Supplementi
- Pub Date:
- 2006
- Bibcode:
- 2006MSAIS...9..433B
- Keywords:
-
- Singol Photon Avalanche Diode;
- Photon counting;
- Device's characterization.