title: Highly efficient broadband sum-frequency generation in the visible wavelength range.
abstract: We report on efficient broadband sum-frequency generation, converting a 140 THz near-infrared bandwidth to the visible regime with photon conversion efficiency greater than 90%. Using a 20-mm-long aperiodically adiabatively poled KTP crystal, the spectral range 660-990 nm was converted to 405-500 nm using a strong pump wave at 1030 nm. The photon conversion efficiency was confirmed to be 92±0.5% when pumped with an intensity of 0.94  GW/cm2. Our experimental results agreed very well with analytic predictions and numerical simulations.
authors: Huseyin
authors: H
authors: Cankaya
authors: Anne-Laure
authors: AL
authors: Calendron
authors: Haim
authors: H
authors: Suchowski
authors: Franz X
authors: FX
authors: Kärtner