Quantum noise reduction in singly resonant sub/second harmonic   generation
  We study the quantum noise in the harmonic mode of a singly resonant frequency doubler simultaneously driven in both modes. This simple extension of the frequency doubler greatly improves its performance as a bright squeezed light source. Specifically, for parameters corresponding to reported experiments, 80 % of noise suppression is easily achieved, the phase of the corresponding squeezed quadrature can be freely and easily chosen, and the output power is nearly doubled. 
C. Cabrillo, J. L. Roldan, P. Garcia-Fernandez