Utilizing weak pump depletion to stabilize squeezed vacuum states
Date
2015
Authors
Denker, T.
Schutte, Dirk
Wimmer, M.H.
Wheatley, T.A.
Huntington, Elanor Harriet
Heurs, Michèle
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Optical Society of America
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. In our experimental setup we observe squeezing levels of 1.96±0.01 dB, with an anti-squeezing level of 3.78±0.02dB (for a 0.55mW seed beam at 1064nm and 67.8 mW of pump light at 532 nm). 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.
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Optics Express
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Journal article
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