Application of an all-solid-state, frequency-doubled Nd:YAP laser to the   generation of twin beams at 1080 nm
  A laser-diode-pumped intracavity frequency-doubled Nd:YAP/KTP laser is presented. Over 110 mw of TEM00 single-frequency output power at 540-nm wavelength was obtained. The output green laser was employed to pump a semimonolithic nondegenerate optical parametric oscillator to produce intensity quantum correlated twin beams at 1080 nm, and the maximum quantum noise squeezing of 74 %(5.9 dB) on the intensity difference fluctuation between the twin beams is observed. The threshold was reduced and the stability was increased significantly when compared with similar lamp-pumped systems. 
Ruixiang Guo, Julien Laurat, Jiangrui Gao, Changde Xie, Kunchi Peng