Mainz 2017 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 4: Quantum Optics I
Q 4.5: Vortrag
Montag, 6. März 2017, 15:45–16:00, P 5
Quantum state tomography of Kerr squeezed femto second pulses in optical fibers — •Oskar Schlettwein, Kai Barnscheidt, and Boris Hage — Institut für Physik, Universität Rostock, Germany
The intensity dependence of the refractive index in standard optical fibers is usually very small (n2∼ 10−20 m2/W). However it still can get a significant impact if short pulses with high peak power are launched into the small mode field diameter of the fiber. Using 250 fs (FWHM) pulses with peak power in the kW regime the impact of the appearing Kerr- and Raman-effect on the quantum properties of the light field are experimentally analyzed. For this purpose a new schema based on a ring cavity is set up to perform a full quantum state tomography of the light field.
Since the fiber output pulses are multimode quantum states the choice of the local oscillator (LO) plays a crucial role in the tomography. Our setup can be used to gain a LO which has the same temporal pulse shape as our signal without any further shaping technics needed. This allows us to also analyze the quantum properties of non-soliton pulses.
With the further addition of a pulse shaper in the LO path the multimode quantum structure of the Kerr squeezed pulses could be experimentally investigated. Our nummerical calculations predict separable squeezed modes in the pulse with a high amount of squeezing. The shape of this modes as well as the progress into their experimental investigation will be demonstrated.