Patents by Julie W Parker

Holographic color control systems

Patent number: 4986619
Abstract: Holographic color control systems are disclosed for the production of pseudocolor holograms by in-situ sequential swelling of an emulsion and exposure to three color separation images with a single wavelength reference light source. The resulting holograms yield images in three color primaries with excellent color registration and mixing, producing a full gamut of mixed colors, pastels and neutrals with three-dimensional perspective.
Issued: January 22, 1991
Assignee: Massachusetts Institute of Technology
Inventors: Julie L. Walker, Stephen A. Benton

Full color holographic image combiner system

Application number: 20040066547
Abstract: A device, such as a heads up display, includes equipment for generating a virtual image in the field of view of an observer. The equipment includes at least one light source having a wavelength range less than 2 nm. The light source can be a low pressure gas discharge lamp. The device also includes a holographic optical element that provides a virtual image. The device also includes an image source, such as a mask or an LCD. In one embodiment the holographic optical element combines an image on a display with an ambient image. The holographic element provides multiple colors undistorted in a virtual image appearing to the observer as converging from the same distance.
Issued: April 8, 2004

In-line holographic mask for micromachining

Patent number: 7099057
Abstract: A method of fabricating a holographic mask includes the steps of providing an illumination source and a non-opaque object mask. The source is for generating a coherent illumination beam directed along an axis. The object mask is capable of transmitting a portion of the illumination beam as undiffracted reference wavefronts. The object mask has one or more substantially transparent elements for creating overlapping object wavefronts when the illumination beam is incident thereon. The object mask is disposed in the illumination beam. A holographic recording medium is provided in the illumination beam in line optically with the object mask. The object mask is illuminated with the illumination beam, thereby causing the object mask to allow undiffracted reference wavefronts to pass therethrough. The illumination directed along the axis causes the one or more substantially transparent elements to create object wavefronts which interact with the undiffracted reference wavefronts to create an interference pattern.
Issued:                         August 29, 2006
Inventors:                                                                        William P. Parker, Julie W. Parker
Application number: 20040047014
Abstract: An optically made, high-efficiency in-line holographic mask (ILHM) for in-line holographic patterning of a workpiece, and apparatus and methods for performing same. The ILHM of the present invention combines the imaging function of a lens with the transmission properties of a standard amplitude mask, obviating the need for expensive projection optics.
Type:                                             Application
Filed:                     September 8, 2003
Issued:                         March 11, 2004
Inventors:                                                                         William P. Parker, Julie W. Parker
Patent number: 6618174
Abstract: An optically made, high-efficiency in-line holographic mask (ILHM) for in-line holographic patterning of a workpiece, and apparatus and methods for performing same. The ILHM combines the imaging function of a lens with the transmission properties of a standard amplitude mask, obviating the need for expensive projection optics. The ILHM is either a type I (non-opaque) or type II (opaque) specialized object mask having one or more substantially transparent elements which can be phase-altering, scattering, refracting and/or diffracting. A method of creating a pattern on a workpiece includes the steps of disposing an ILHM, disposing a workpiece adjacent the ILHM and illuminating the ILHM to impart a pattern to the workpiece. In another method, the ILHM is used in combination with a lens. The ILHM is disposed such that a holographic real image is formed at or near the lens object plane, and the workpiece is disposed at or near the lens image plane.
Type:                                             Grant
Filed:                     November 14, 1997
Issued:                         September 9, 2003
Assignee:                                                 Diffraction, LTD
Inventors:                                                                         William P. Parker, Julie W. Parker
Application number: 20020039209
Abstract: An optically made, high-efficiency in-line holographic mask (ILHM) for in-line holographic patterning of a workpiece, and apparatus and methods for performing same. The ILHM of the present invention combines the imaging function of a lens with the transmission properties of a standard amplitude mask, obviating the need for expensive projection optics.
Type:                                             Application
Filed:                     November 14, 1997
Issued:                         April 4, 2002
Inventors:                                                                         WILLIAM P. PARKER, JULIE W. PARKER

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