[RpL 770] Fwd: Maria Chekhova: Giant twin-beam generation along the pump energy propagation (23.12)

Пн Дек 15 15:33:12 MSK 2014

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Subject: 	Maria Chekhova: Giant twin-beam generation along the pump 
energy propagation (23.12)
Date: 	Mon, 15 Dec 2014 12:05:30 +0000
From: 	Russian Quantum Center information <info на rqc.ru>
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To: 	<akorneev на rplab.ru>

Maria Chekhova: Giant twin-beam generation along the pump energy 
propagation (23.12)

    Maria Chekhova: Giant twin-beam generation along the pump energy
    propagation

*On 23th of December at 17:00* Maria Chekhova, a head of Quantum 
Radiation group and Single-Photon Technology unit at Max-Planck 
Institute for the Science of Light in Erlangen, Germany, and 
simultaneously a part-time lecturer at Moscow State University, will 
hold a seminar in the Russian Quantum Center:

«Walk-off effects, originating from the difference between the group and 
phase velocities, limit the efficiency of nonlinear optical 
interactions. While transverse walk-off can be eliminated by proper 
medium engineering, longitudinal walk-off is harder to avoid. In 
particular, ultrafast twin-beam generation via pulsed parametric 
down-conversion and four-wave mixing is only possible in short crystals 
or fibres or in double-path schemes. In our recent experiments, we have 
shown that in high-gain parametric down-conversion, one can overcome the 
destructive role of both effects and even turn them into useful tools 
for shaping the emission. In one of our experiments, the signal beam is 
emitted along the pump Poynting vector; in another one, group velocity 
of the signal beam matches that of the pump. The result is dramatically 
enhanced generation of both signal and idler twin beams, with the 
simultaneous narrowing of angular and frequency spectrum. The effect 
will enable efficient generation of ultrafast twin photons and beams in 
cavities, waveguides, and whispering-gallery mode resonators. It also 
provides a source of tunable broadband radiation with high directivity, 
which can be considered as an OPO without a cavity.»

Maria Chekhova is head of Quantum Radiation group and Single-Photon 
Technology unit at Max-Planck Institute for the Science of Light in 
Erlangen, Germany. She is also part-time affiliated with M.V. Lomonosov 
Moscow State University. She has authored more than 100 papers in 
refereed journals. Her research is focused on the generation and 
characterization of nonclassical light, obtained via nonlinear optical 
effects as well as from nano-emitters. Her main achievements are 
investigation of the polarization properties of single-mode biphotons, 
observation of the dispersion spreading of a biphoton, generation of 
bright squeezed vacuum in polarization-entangled states and witnessing 
its macroscopic entanglement. She is teaching courses on nonlinear 
optics and related subjects at the Lomonosov Moscow State University and 
the University of Erlangen-Nuremberg. She also gave short courses at the 
Extreme Photonics School in Ottawa, 2013 and 2014.

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