Abstract

We consider a degenerate optical parametric oscillator (DOPO). A coherent signal is injected with real amplitude ϵ and phase 2iω₀t. The cavity has two resonant modes at frequencies ν₁ ≃ ω₀ and ν₂ ≃ 2ω₀. A nonlinear crystal converts photons of frequency ν₂ into pairs of photons of frequency ν₁ = v₂/2. A saturable absorber is inserted in the cavity and can absorb photons at the frequency ν₁. The absober is described by a collection of N homogeneously broadened two-level atoms with atomic frequency ω ≃ ω₀.

© 1991 Optical Society of America