We investigate a degenerate optical parametric device with a transversely finite unstable cavity configuration operated below threshold. Using an approximate quantum description in terms of a biorthogonal set of effective cavity-matched modes and their adjoint modes, we predict an intracavity field intensity enhancement by the Petermann excess-noise factor, <i>K</i> . This enhancement is accompanied by a reduction of photon bunching and quadrature squeezing.
© 2002 Optical Society of America
(190.4410) Nonlinear optics : Nonlinear optics, parametric processes
(230.4910) Optical devices : Oscillators
(270.2500) Quantum optics : Fluctuations, relaxations, and noise
(270.4180) Quantum optics : Multiphoton processes
Claus Lamprecht and Helmut Ritsch, "Excess-noise-enhanced photon-pair generation in unstable resonators," Opt. Lett. 27, 757-759 (2002)