Hamburg 2009 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 46: Quanteneffekte: Lichtstreuung und Ausbreitung

Q 46.7: Vortrag

Donnerstag, 5. März 2009, 12:00–12:15, VMP 6 HS-E

Four-wave mixing enhanced white-light cavity — •Jörg Evers and Robert Fleischhaker — MPI für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg

In an optical cavity, the bandwidth of supported frequencies and the intensity buildup are inversely proportional. Thus, higher buildup is only possible at the cost of a reduced available frequency range, and this limits possible applications such as in gravitational wave detection. To overcome this limitation, the concept of a white-light cavity was developed, in which the bandwidth of the cavity is enhanced via a medium with negative dispersion inside the cavity. The negative dispersion leads to a frequency-dependent phase compensation that effectively renders a wider range of frequencies resonant with the cavity [1].

Here, we discuss a white-light cavity medium based on four-level atoms in double-Λ configuration. This configuration is known to exhibit resonantly enhanced four-wave mixing [2], such that the spatiotemporal dynamics inside the medium becomes relevant. We perform a full simulation of the propagation of all fields, and find that the probe field dispersion is in addition changed by a coherent field which is generated within the medium via four-wave mixing. Counterintuitively, this in-medium dynamics leads to a further enhancement of the cavity bandwidth [3].

[1] A. Wicht et al., Opt. Commun. 134, 431 (1997)

[2] M. Jain et al., Phys. Rev. Lett. 77, 4326 (1996)

[3] R. Fleischhaker and J. Evers, Phys Rev. A 78, 051802(R) (2008)