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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Generation of two-mode squeezed states by nondegenerate optical parametric process

Kunchi Peng, Changde Xie, Maoquan Huang, Jingde Liu, Tiancai Zhang, Yimin Lian, Chen Yu

Published May 11, 1993• 0 citations
Publisher

Abstract

The full quantum treatment on the three-mode interaction in an optical parametric oscillator (OPO) is presented. The simultaneous resonance of three nondegenerate modes in the OPO cavity has been experimentally demonstrated. Reductions in photocurrent noise of 30% relative to the vacuum noise level are obtained for frequency offsets near 2 MHz.

DOI
10.1117/12.144094

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The full quantum treatment on the three-mode interaction in an optical parametric oscillator (OPO) is presented. The simultaneous resonance of three nondegenerate modes in the OPO cavity has been experimentally demonstrated. Reductions in photocurrent noise of 30% relative to the vacuum noise level are obtained for frequency offsets near 2 MHz.
A full quantum treatment about the process of parametric down-conversion with frequency degenerate but polarization non-degenerate in an optical parametric oscillator (OPO) cavity is presented. Using the linearized Langevin equations and spectral matrix, we calculated the squeezing spectra of the coupled mode in the output field. The squeezing as a function of driving field and detection frequency is obtained. The results obtained, which are compared with those found semiclassically by Reynaud et al. , indicate that it is possible to generate a two-mode coherent squeezed state with large amplitude. The quantum correlation between the signal and the idler modes is also discussed. It is shown that there is an inseparable relationship between the two-mode squeezing and the intermode quantum correlation.
We have constructed a mode-locked optical parametric oscillator (OPO), synchronously pumped by the second harmonic of a continuously mode-locked Nd:YAG laser and based on type II phase matching in a KTP crystal. The two subharmonics (signal and idler waves) are nearly degenerate in frequency but are distinct orthogonal polarization states, and the oscillator is thus a nondegenerate OPO. Above threshold, the intensities of the signal and idler output beams should be highly correlated, as recently demonstrated for a similar single-frequency OPO.1 Ideally, the quantum noise on the corresponding photocurrent difference signal is completely suppressed for frequencies that are small compared to the OPO cavity bandwidth. Since this configuration produces intense light beams with potentially very good noise suppression, it is an important prototype for possible applications, e.g., to spectroscopy. Initial results with our OPO show an excess uncorrelated polarization noise, possibly due to depolarized light scattering in the KTP crystal. When the OPO cavity is stabilized with the signal and idler degenerate in frequency, they can be mixed to form a superposition by manipulating their polarization. When the oscillator is pumped below threshold, a pulsed squeezed vacuum state is produced in two such mixtures.2 When the polarizations are mixed inside the OPO cavity by a Faraday rotator, the backaction evasion necessary for a quantum nondemolition (QND) measurement of one of the field quadratures of an externally injected beam is obtained.3 The pulsed local oscillator used in observing the squeezing or QND effects is derived from the fundamental output of the pump laser. Progress in implementing these experiments with our mode-locked OPO is described as well as possible applications to time-domain measurements with noise below the shot-noise limit.