Hannover 2016 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 11: Poster: Quantum Optics and Photonics I
Q 11.33: Poster
Montag, 29. Februar 2016, 16:30–19:00, Empore Lichthof
Correlation measurement via unbalanced homodyning with a weak local oscillator — •Christian Reiher1, Melanie Mraz1, Steve Jäger1, Semjon Köhnke1, Johannes Kröger2, Jan Sperling3, Heinrich Stolz2, Werner Vogel3, and Boris Hage1 — 1AG Experimentelle Quantenoptik, Institut für Physik, Universität Rostock, Germany — 2AG Halbleiteroptik, Institut für Physik, Universität Rostock, Germany — 3AG Theoretische Quantenoptik, Institut für Physik, Universität Rostock, Germany
We present an experiment to evaluate the photostatistics of squeezed states of light by correlation measurements via unbalanced homodyne detection with a weak local oscillator. As squeezer an optical parametric amplifier with a PPKTP-chrystal is used. The measurements will be carried out with a τ-SPAD (single-photon avalanche diode) click detector. The main task will be to attenuate the light field to a sufficiently low intensity. Hence the cleanness of the used light field is of special interest, i.e. no other light should trigger our detector, like the light of the pump beam, the seed beam or stray light. The pump beam will be blocked by dichroic mirrors and an edge filter. The seed beam will be blocked by two out of phase rotating choppers. The second one opens the path to the detector only while the first one blocks the seed beam, resulting in a disruption of cavity-length-control. First investigations showed, that there is no negative effect on the resonator length by using this method. This way we make sure that no other event will occur during the deadtime of the detector.