title: Quantum-noise measurements in high-efficiency single-pass second-harmonic generation with femtosecond pulses.
abstract: The quantum-noise properties of single-pass second-harmonic blue-light generation with femtosecond pulses have been measured. A conversion efficiency of as much as 63.5% of second-harmonic generation at 428.8 nm was observed in a KNbO(3) crystal with femtosecond (130-fs) pulses with wavelengths centered at 857.6 nm. The quantum noise on the generated blue light was measured to be 1.0 dB (1.4 dB of squeezing inferred) below the shot-noise limit. The noise reduction was found to be sensitive to the average power and the center wavelength of the input fundamental pulses under the condition of strong pump depletion.
authors: Y Q
authors: YQ
authors: Li
authors: D
authors: D
authors: Guzun
authors: M
authors: M
authors: Xiao