Northrop Grumman Systems Corporation

Other

Litton Systems, Inc.

Northrop Grumman Guidance and Electronics Company, Inc.

Sanan Shaibani

John Mansell

Joseph Krystkowiak

Akbar Arab-Sadeghabadi

Bahram Khoobehi

A Douglas Meyer

Marguerite B McDonald

Stephen D Klyce

Akbar Arab-Sadenghabadi

John S Morvant, Jr

Joseph Krysthowiak

Akbar Arab Sadenghabadi

A fiber optic acoustic transducer includes a mandrel having a first portion that preferably formed generally as a cylinder having a projection extending from one end. A grating collar also preferably formed in a generally cylindrical configuration. The grating collar has a passage extending therethrough so that it may mounted on the projection. An optical fiber has a sensor portion wound around the first portion of the mandrel and a second portion wound around the grating collar with a fiber Bragg grating being formed in the second portion of the optical fiber.

Transducer mandrel with attachment for holding fiber Bragg grating mounting collar

A method is provided for producing an optical acoustic sensor. In one embodiment, a method comprises winding a single-mode optical sensor fiber around at least one mandrel. The optical acoustic sensor fiber can comprise a core region having a diameter of about 2 &#x3bc;m to about 8 &#x3bc;m and a cladding region having an outer diameter of about 8 &#x3bc;m to about 20 &#x3bc;m. The method can also comprise interconnecting the at least one mandrel into an optical acoustic sensor.

Micro fiber optical sensor

Optical fibers, especially those having a core layer, a cladding layer over the core layer, FBG's formed in the core layer, the cladding layer, or both, a buffer layer over the cladding layer, and an outer jacketing layer.

Optical sensor fiber with protective jacketing layers

Methods and apparatus for reducing noise in optical apparatus comprising a delay line by utilizing a plurality of wavelength specific delay lines to delay an input waveform such as a pulse rather than a single delay line. In a preferred embodiment an apparatus is configured to generate an optical waveform by distributing an input optical waveform among a plurality of environmentally isolated legs, wherein each leg contributes to the generated optical waveform by reflecting back at least a portion of light distributed to the leg, and the distribution among the plurality of legs is at least partially wavelength dependent.

Compensating interferometer including delay lines with reduced noise

Methods and apparatus for generating an optical waveform by distributing an input optical waveform among a plurality of environmentally isolated legs wherein each leg comprises a Bragg grating and contributes to the generated optical waveform by using the Bragg grating to reflect back at least a portion of light distributed to the leg.

Compensating interferometer with Bragg reflectors

An apparatus for profiling a cornea of an eye is disclosed which comprises a topography instrument for determining the curvature of the cornea, a computer system for receiving information from the topography instrument for determining whether any areas of the cornea need to be ablated to correct for any abnormalities of the cornea, a diffractive optical element which is constructed based upon the determination of which areas of the cornea need to be ablated, and a beam of radiation being projected at the diffractive optical element for the diffractive optical element to modulate the beam of radiation and direct the modulated beam of radiation at the cornea for ablating the cornea to correct for any abnormalities of the cornea.

Laser surgical apparatus for sculpting a cornea using a diffractive

A laser (e.g., excimer laser) and masking apparatus performs controlled sculpting of eye surfaces, such as corneal surfaces. The masking system includes a single/multi-layer (e.g., metallic) coated substrate (e.g., fused silica) with multiple openings in the substrate of desired size, shape and spacing to control the power transmission of a laser used in conjunction with the mask. The power transmission is controlled through the use of diffraction and absorption. The power transmission can be attuned to a particular surface by using topographical information of the surface in question. The surgeon can observe the topographical information and then pattern the openings (size, number, shape, spacing) so that reshaping can be done with greater intensity (using larger or more openings) to remove more corneal tissue in areas that the surgeon feels need more reshaping. Areas that need less reshaping can be masked complete by not placing holes or openings in that area of the mask, or by placing fewer or smaller openings.

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Woodland Hills, CA, United States of America

Sanan Shaibani