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Free keywords:
Quantum Physics, quant-ph, Physics, Optics, physics.optics
Abstract:
We report on the experimental frequency conversion of a dim, coherent
continuous-wave light field from 1550nm to 532nm with an external photon-number
conversion efficiency of (84.4 +/- 1.5)%. We used sum-frequency generation,
which was realized in a standing-wave cavity built around a periodically poled
type I potassium titanyl phosphate (PPKTP) crystal, pumped by an intense field
at 810 nm. Our result is in full agreement with a numerical model. For
optimized cavity coupler reflectivities it predicts a conversion efficiency of
up to 93% using the same PPKTP crystal.