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Updated: Mar 19, 2026

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
Parallel-to-orthogonal optical polarization conversion for the generation of phase-modulated millimeter-wave signals
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A novel technique, to our knowledge, for manipulating the polarization states of two longitudinal oscillation modes emitted from a Nd:YVO4 microchip laser was developed. The laser was designed to oscillate in two longitudinal modes with a frequency difference of over 100 GHz, thereby making it suitable as a light source for generating high-purity millimeter waves above 100 GHz. A birefringent crystal was used to orthogonalize the polarization states of the two modes, such that their difference in retardations differed by π radian. The resultant polarization states were successfully stabilized using an active feedback control through the electro-optic effect of the birefringent crystal.
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