[1] R. E. Slusher, L. W. Hollberg, B. Yurke et al.. Observation of squeezed states generated by four-wave mixing in an optical cavity. Phys. Rev. Lett., 1985, 55(22): 2409~2412
[2] L. A. Wu, H. J. Kimble, J. Hall et al.. Generation of squeezed stares by parametric down conversion. Phys. Rev. Lett., 1986, 57(20): 2520~2523
[3] S. Machicla, Y. Yamamoto. Ultrboadband amplitude squeezing in a semiconductor laser. Phys. Rev. Lett., 1988, 60(9): 792~794
[4] A. Heidmann, R. J. Horowicz, S. Reynaud et al.. Observation of quantum noise reduction on twin laser beams. Phys. Rev. Lett., 1987, 59(22): 2555~2557
[6] J. J. Snyder, E. Giacobin, C. Fabre et al.. Sub-shot-noise measurement using the beat note bwtween quantum-correlated photon beams. J. Opt. Soc. Am. (B), 1990, 7(10): 2132~2136
[7] C. D. Nabors, R. M. Shelby. Two-color squeezing and sub-shot-noise signal recovery in doubly resonant optical parametric oscillators. Phys. Rev. (A), 1990, 42(1): 556~559
[8] J. Mertz, T. Debuisschert, A. Heidmann et al.. Improvement in the observed intensity correlation of optical parametric oscillator twin beams. Opt. Lett., 1991, 16(16): 1234~1236
[10] C. Fabre, E. Giacobino, A. Heidmannand et al.. Noise characteristics of a non-degenerate optical parametric oscillator. J. Phys., 1989, 50(15): 1209~1225
[11] Gao Jiangrui, Wang Hai, Huang Maoquan et al.. Intracavity frequency-doubled and stabilized CW ring Nd:YAG laser with a pair of KTP crystals. Appl. Opt., 1995, 34(9): 1519~1522