Quantum statistics of a novel frequency doubler
Andrew G. White, Hans‐A. Bachor, David E. McClelland
Monolithic cavities are used in experiments requiring compactness, reduced optical losses, and high mechanical, temperature, and frequency stability. The evanescently coupled monolith, or MOTIRR (MOnolithic Total Internal Reflection Resonator) is of particular interest because it allows very high finesse, the limit to the losses being set solely by the intrinsic absorption of the monolith material and the surface quality of the monolith and coupler. Singly and doubly resonant frequency doubling systems are predicted to exhibit squeezing in both the fundamental and the second harmonic modes. This has been observed in dielectric-coated monolithic systems, which have produced the most intense bright squeezing yet observed. However, because these systems use dielectric coatings, they are wavelength dependent, reducing the utility of the beam for applications of bright squeezing, such as spectroscopy. Evanescently coupled systems have no particular wavelength dependence and are thus suitable as broadband doublers. Indeed, they have recently been used to generate bright squeezed light. However, current designs impose a fixed phase relationship between the fundamental and the second harmonic. If this relationship is not at an optimum, which is normally the case, the effective nonlinear coupling constant can be degraded significantly, which, in turn, may degrade the squeezing. We present a novel design for a MOTIRR that allows the phase between the fundamental and second harmonic to be tuned experimentally. Further, it uses polarization-sensitive coupling to allow independent control of the amplitudes of the fundamental and second-harmonic modes. Preliminary results on conversion efficiencies and quantum-noise behavior of the fundamental and second-harmonic modes are given.
•May 8, 1994•0 citations