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Applied Physics B

Generation of two-mode quadrature-phase squeezing and intensity-difference squeezing from a cw-NOPO

K. C. Peng, Q. Pan, H. Wang, Yichi Zhang, H. Su, C.D. Xie

Published Jun 1, 1998• 49 citations
Publisher
DOI
10.1007/s003400050463

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Physical Review A•Feb 20, 2008•20 citations
The configuration of a semimonolithic continuous nondegenerate optical parameter oscillator consisting of an α-cut KTP crystal pumped by an intracavity frequency-doubled and frequency-stabilized Nd∶YAP laser is designed. Both two-mode quadrature-phase squeezing of 3.7dB and intensity-difference squeezing of 7dB have been generated from the cw-NOPO operating respectively below and above the oscillation threshold. The system can operate stably to generate the squeezed light for over half an hour.
The stable red laser,which is generated by the laser at 1.3 μm wavelength from an all-solid-state single frequency infrared laser pumping a frequency-doubler,is used to pump a continuous wave nondegenerate optical parametric oscillator(cw-NOPO) consisting of LBO crystal with type-Ⅱ non-critical phase matching.The intensity-difference squeezing of 3.9 dB at a telecommunication wavelength has been generated from the cw-NOPO operating above the oscillation threshold through the frequency down-conversion process.
We investigate time-dependent properties of Einstein-Podolsky-Rosen (EPR) light beams generated in a nondegenerate optical parametric oscillator (NOPO) driven by a sequence of laser pulses with Gaussian time-dependent envelopes. This investigation continues our previous analysis [H. H. Adamyan and G. Yu. Kryuchkyan, Phys. Rev. A 74, 023810 (2006)] and involves problems of two-mode quadrature squeezing as well as intensity-difference squeezing in the time domain. The peculiarities of EPR beams are also discussed in the framework of phase-space quantum distributions. Two kinds of non-Gaussian Wigner functions, for the reduced one-mode state of periodically pulsed NOPO and for EPR beams which are combined on a one-half beam splitter are calculated numerically. We also investigate the Wigner functions of intensity-correlated twin beams following the conditional photon state-preparation scheme. It is demonstrated that the Wigner functions involve negative values in parts of the phase space for the schemes with one, two, and three photons.