Erlangen 2018 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 2: Quantum Optics I

Q 2.2: Vortrag

Montag, 5. März 2018, 11:00–11:15, K 0.016

A Source of correlated photons for femtosecond quantum spectroscopy — •Fabiano Lever, Axel Heuer, Jan Metje, and Markus Guehr — Institut für Physik und Astronomie 0.033, Haus 28, Karl-Liebknecht-Straße 24/25 14476 Potsdam-Golm

In this work, we present a source of down converted photons for future use in nonlinear quantum spectroscopy, in our case on a halogen gas sample. The broadband signal and idler photons which are generated from a narrowband pump pulse are chosen to be resonant with electronic transitions in the sample. The idler pulse creates a nuclear wavepacket whose state is then read by the signal pulse. Although the duration of the two pulses is long, as determined by the narrowband pump, time resolution is obtained due to quantum correlations.

The pump light for the down conversion is obtained in a two step process, a femtosecond Yb:KGW laser is first shifted via transient stimulated Raman scattering and subsequently doubled in an non critically phase matched LBO. A chirped PPLN crystal is then used to obtain a broadband downconversion of the pump into correlated signal and idler beams.