USA As Represented by Secretary of the Navy

Anthony Garzarella

Dong Ho Wu

An ultra-sensitivity optical-fiber magneto-optic field sensor includes an input fiber passing optical power from an optical source into the sensor; a polarizer optically coupled to and downstream of the input fiber; an analyzer optically coupled to and downstream of the polarizer; an output fiber passing optical power out of the sensor to a photoreceiver; and a magneto-optic crystal element optically coupled between the polarizer and the analyzer. The ultra-sensitivity optical-fiber magneto-optic field sensor has an optical axis extending between the input and output fibers along which a beam of optical power is transmitted.

Apparatus and system for an ultra sensitivity magneto-optic sensor for high sensitivity magnetic field detection and measurements

An apparatus, for measuring an applied electrical field and for reducing perturbation to the electrical field being measured, includes a laser integrated into an electro optic crystal sensor head prior to the output fiber. A probe beam is passed along the crystal direction of low birefringence of nearly circular optical indicatrix, rather than one of high EO modulation. The EO crystal is placed between two crossed polarizers and oriented such that a small tilt angle is subtended between its optic axis and the path of the probe beam. Improved optical coupling is achieved by using a large core multimode fiber at the output, to reduce optical insertion losses. A collimating lens emits the intensity modulated laser beam back to a photodetector, where the intensity modulated laser beam is converted to an electrical signal representing both field strength and phase of the electrical field applied to the sensor head.

Apparatus and system for a quasi longitudinal mode electro optic sensor for high power microwave testing

An apparatus, for measuring an electric field while minimally perturbing the electric field being measured, includes an analyzing stage and a sensor head. The sensor head is optically coupled to the analyzing stage by a laser probe beam transmitted from the analyzing stage. The sensor head includes an electro optic crystal disposed between two gradient index lenses, where the first gradient index lens emits a laser beam transmitted from the analyzing stage to the sensor head, where the electric field is applied and where, the electro optic crystal transforms the laser beam probe into a phase modulated laser beam. The second gradient index lens transmits the phase modulated laser beam back to the analyzing stage, where polarization optics and a photodetector convert the phase modulated laser beam into an electrical signal representing field strength and phase of the electric field.

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Ellicott City, MD, United States of America

Anthony Garzarella