Excess-noise-enhanced parametric down conversion
نویسندگان
چکیده
We calculate the influence of excess noise on parametric down conversion in an unstable optical parametric oscillator ~OPO!, using a quantum quasimode description. We find a strongly enhanced pair photon generation rate below threshold as compared to a conventional stable cavity setup of comparable gain and loss. In addition, the oscillation threshold is lowered due to the influence of the excess noise and the squeezing properties of the emitted light are significantly changed. In general, the maximal quantum-noise suppression in one quadrature component is reduced, which poses strong limitations for the practical usefulness of a geometrically unstable OPO source. The analytical results from our quasimode description are in good agreement with numerical simulations using a positive-P representation of the field in mode space and in position space.
منابع مشابه
Does Excess Quantum Noise Exist in Spontaneous Processes?
We investigate the role of excess quantum noise in type-II degenerate parametric down conversion in a cavity with non-orthogonal polarization eigenmodes. Since only two modes are involved we are able to derive an analytical expression for the twin-photon generation rate measured outside the cavity as a function of the degree of mode nonorthogonality. Contrary to recent claims we conclude that t...
متن کاملNoise characteristics of correlated two-photon production via parametric down-conversion
This paper gives a review of the phase and intensity quantum correlation between two photons in the process of optical parametric down-conversion (OPDC). Special emphasis is on the squeezed spectrum and squeezed intensity fluctuations in non-degenerate OPDC above threshold. Several experimental results of squeezed spectra and sub shot-noise intensity fluctuations are presented. PACS number(s): ...
متن کاملEfficiency-enhanced optical parametric down conversion for mid-infrared generation on a tandem periodically poled MgO-doped stoichiometric lithium tantalate chip.
We report an efficiency-enhanced mid-infrared generation via optical parametric down conversion. A tandem periodically-poled MgO-doped stoichiometric lithium tantalate crystal is used to realize on-chip generation and amplification of mid-infrared radiation inside an optical parametric oscillator cavity. We achieved 21.2% conversion efficiency (24% slope efficiency), which is among the highest ...
متن کاملEntanglement and nonclassicality in four-mode Gaussian states generated via parametric down-conversion and frequency up-conversion
Multipartite entanglement and nonclassicality of four-mode Gaussian states generated in two simultaneous nonlinear processes involving parametric down-conversion and frequency up-conversion are analyzed assuming the vacuum as the initial state. Suitable conditions for the generation of highly entangled states are found. Transfer of the entanglement from the down-converted modes into the up-conv...
متن کاملSpectral properties of high-gain parametric down-conversion.
High-gain parametric down-conversion (PDC) is a source of bright squeezed vacuum, which is a macroscopic nonclassical state of light and a promising candidate for quantum information applications. Here we study its properties, such as the intensity spectral width and the spectral width of pairwise correlations. In agreement with the theory, we observe an increase in the spectral width by 27% co...
متن کامل