Pump depletion in parametric down-conversion with low pump energies

Flórez, Jefferson; Lundeen, Jeff S.; Chekhova, M. V.

doi:10.1364/OL.394925

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Pump depletion in parametric down-conversion with low pump energies

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Chekhova, M. V.
Chekhova Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;
Institute of Optics, Information and Photonics, University of Erlangen-Nürnberg;
Department of Physics, M. V. Lomonosov Moscow State University;

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Citation

Flórez, J., Lundeen, J. S., & Chekhova, M. V. (2020). Pump depletion in parametric down-conversion with low pump energies. Optics Letters, 45(15), 4264-4267. doi:10.1364/OL.394925.

Cite as: https://hdl.handle.net/21.11116/0000-0006-C879-1

Abstract

We report the efficient generation of high-gain parametric down-conversion, including pump depletion, with pump powers as low as 100 μW (energies 0.1 μJ/pulse) and conver- sion efficiencies up to 33%. In our simple configuration, the pump beam is tightly focused into a bulk periodically poled lithium niobate crystal placed in free space. We also observe a change in the photon number statistics for both the pump and down-converted beams as the pump power increases to reach the depleted pump regime. The experimental results are a clear signature of the interplay between the pump and the down-converted beams in highly efficient parametric down-conversion sources