Lovering, D.J., Levenson, J.A., Vidakovic, P., Webjörn, J. and Russell, P.St.J.
Noiseless optical amplification in quasi-phase-matched bulk lithium niobate
Optics Letters, 21, (18), . (doi:10.1364/OL.21.001439).
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An optical parametric amplifier (OPO) has been demonstrated in bulk, periodically poled lithium niobate and is shown to operate with a noise figure well below the classical limit. In contrast to conventional OPSs, this device uses quasi-phase matching to provide the coupling between the pump and the signal. Comparison of the measured performance with that of a theoretical model reveals that the main intrinsic contribution to the output noise is due to spatial and temporal mode mixing, which arises as a consequence of tight focusing of the incident beams. Factors that affect the performance of this amplifier are identified theoretically and their relative importance investigated for both amplification and squeezing.
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