We report the generation of sub-Poissonian pulses of light by means of traveling-wave second-harmonic generation (SHG) in a type II phase-matched nonlinear crystal. On direct detection, the quantum noise on the output light, which is polarized orthogonally to the input fundamental field, is measured to be below the shot-noise limit by as much as 0.3 ± 0.2 dB (6 ± 4%). We show that the input fundamental-power dependence of the measured Fano factor, direct-detection noise as a fraction of the shot-noise limit, is in qualitative agreement with the quantum theory of SHG.
© 1996 Optical Society of America
Original Manuscript: April 22, 1996
Published: October 1, 1996
SunHyun Youn, Sang-Kyung Choi, Prem Kumar, and Ruo-Ding Li, "Observation of sub-Poissonian light in traveling-wave second-harmonic generation," Opt. Lett. 21, 1597-1599 (1996)