1
Roger J Withrington: Optical display systems utilizing holographic lenses. Hughes Aircraft Company, W H MacAllister, Walter J Adam, February 24, 1976: US03940204 (158 worldwide citation)

This invention is applicable to display systems, such as in a helmet mounted display or a head-up display, utilizing a holographic lens operating at a relatively large off-axis angle in order to perform the dual function of a combiner glass and an eyepiece. The holographic lens is used in conjunctio ...


2
Roger J Withrington, Lacy G Cook, Helene H Jones: Holographic head-up displays. Hughes Aircraft Company, Allen A Dicke Jr, W H MacAllister, August 19, 1980: US04218111 (94 worldwide citation)

There is disclosed an integrated optical design of head-up displays suitable for use in aircraft cockpits and the like. The display system is comprised of a holographic optical element used as the combiner for presenting a direct view of the exterior on which are superimposed image signals generated ...


3
Lacy G Cook, Roger J Withrington: Method and laser beam directing system with rotatable diffraction gratings. Raytheon Company, John E Gunther, Leonard A Alkov, William C Schubert, September 14, 2004: US06792028 (28 worldwide citation)

A laser beam pointing and positioning system includes first and second rotatable diffraction gratings. Each grating deviates a laser beam by a predetermined angle of deviation. The relative rotational position of the gratings is controlled to change the beam steering angle and direction of a laser b ...


4
Lowell M Hobrock, Hugh L Garvin, Roger J Withrington, Clarke T Wellman: Method for fabrication of low efficiency diffraction gratings and product obtained thereby. Hughes Aircraft Company, William J Streeter, A W Karambelas, May 9, 1989: US04828356 (10 worldwide citation)

A reflector and method for fabricating diffraction gratings in reflectors comprises the steps of placing one or more layers (38, 56-64) of a dielectric reflective enhancing material on a reflective surface (34, 54), and forming grooves (40, 66) only in the top layer (38, 64) of the dielectric materi ...


5
Lacy G Cook, Roger J Withrington: Method and laser beam directing system with rotatable diffraction gratings. Patent Docket Administration, Raytheon Systems Company, September 25, 2003: US20030179804-A1

A laser beam pointing and positioning system includes first and second rotatable diffraction gratings. Each grating deviates a laser beam by a predetermined angle of deviation. The relative rotational position of the gratings is controlled to change the beam steering angle and direction of a laser b ...