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Proceedings Paper

Controllable photon source
Author(s): Dániel Oszetzky; Attila Nagy; Aladár Czitrovszky
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Paper Abstract

We have developed our pervious experimental setup using correlated photon pairs (to the calibration of photo detectors) to realize a controllable photon source. For the generation of such photon pairs we use the non-linear process of parametric down conversion. When a photon of the pump beam is incident to a nonlinear crystal with phase matching condition, a pair of photons (signal and idler) is created at the same time with certain probability. We detect the photons in the signal beam with a single photon counting module (SPCM), while delaying those in the idler beam. Recently we have developed a fast electronic unit to control an optical shutter (a Pockels cell) placed to the optical output of the idler beam. When we detect a signal photon with the controlling electronic unit we are also able to open or close the fast optical shutter. Thus we can control which idler photons can propagate through the Pockels cell. So with this photon source we are able to program the number of photons in a certain time window. This controllable photon source that is able to generate a known number of photons with specified wavelength, direction, and polarization could be useful for applications in high-accuracy optical characterisation of photometric devices at the ultra-low intensities. This light source can also serve as a standard in testing of optical image intensifiers, night vision devices, and in the accurate measurement of spectral distribution of transmission and absorption in optical materials.

Paper Details

Date Published: 25 October 2006
PDF: 6 pages
Proc. SPIE 6372, Advanced Photon Counting Techniques, 637214 (25 October 2006); doi: 10.1117/12.685999
Show Author Affiliations
Dániel Oszetzky, Research Institute for Solid State Physics and Optics (Hungary)
Attila Nagy, Research Institute for Solid State Physics and Optics (Hungary)
Aladár Czitrovszky, Research Institute for Solid State Physics and Optics (Hungary)

Published in SPIE Proceedings Vol. 6372:
Advanced Photon Counting Techniques
Wolfgang Becker, Editor(s)

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