Patent ID: 8717666
Filing Date: 2014-05-06
Classification: G02F

Abstract:
1. A miniature, solid-state, compact source of entangled photons comprising: a laser source to produce a laser beam; a pair of nonlinear crystals in physical contact along mutually confronting optical surfaces, with one of the pair of nonlinear crystals having an input face with the laser beam incident thereon and the other of the pair of nonlinear crystals having an output face and rotated 90°, along an axis perpendicular to the input face; a high reflection coating on the output face, wherein as the laser beam exits the high reflection coating, the laser beam comprises a spatially separated laser emission and an spontaneous parametric down conversion (SPDC) light emission; a wavelength dispersive device to block the spatially separated laser emission and redirect the SPDC light emission; a fiber coupling point, configured to receive the SPDC light emission; and a monolithic base substrate to which the laser source, the pair of nonlinear crystals and the fiber coupling point are mounted so at to establish and preserve alignment during manufacture; and wherein the miniature, solid-state compact source of entangled photons requires only milliwatts of electrical power for operation.