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Utilizing weak pump depletion to stabilize squeezed vacuum states

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Heurs,  Michele
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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Fulltext (public)

1503.02854.pdf
(Preprint), 3MB

oe-23-13-16517.pdf
(Any fulltext), 18MB

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Citation

Denker, T., Schütte, D., Wimmer, M. H., Wheatley, T. A., Huntington, E. H., & Heurs, M. (2015). Utilizing weak pump depletion to stabilize squeezed vacuum states. Optics Express, 23: 016517. doi:10.1364/OE.23.016517.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0028-5A19-3
Abstract
We propose and demonstrate a pump-phase locking technique that makes use of weak pump depletion (WPD) - an unavoidable effect that is usually neglected - in a sub-threshold optical parametric oscillator (OPO). We show that the phase difference between seed and pump beam is imprinted on both light fields by the non-linear interaction in the crystal and can be read out without disturbing the squeezed output. Our new locking technique allows for the first experimental realization of a pump-phase lock by reading out the pre-existing phase information in the pump field. There is no degradation of the detected squeezed states required to implement this scheme.