Patents by Inventor Dennis M. Callahan, JR.

Dennis M. Callahan, JR. has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 11054676
    Abstract: A system and method for improving spatial light modulator (SLM) devices such as Surface Acoustic Wave (SAW) modulators are disclosed. The SAW modulators can improved angular bandwidth and suppress unwanted diffractive orders. In one example, a coating layer(s) is applied to a proximal face of the SAW modulator to improve coupling of guided modes into leaky modes. Additionally, applying coating layers(s) such as a hybrid anti-reflective/highly reflective coating to an exit face of the SAW modulator can suppress transmission of undesired diffractive order(s).
    Type: Grant
    Filed: May 25, 2018
    Date of Patent: July 6, 2021
    Assignee: The Charles Stark Draper Laboratory, Inc.
    Inventors: Ian Ward Frank, Jeffrey A. Korn, Steven J. Byrnes, Dennis M. Callahan, Jr.
  • Publication number: 20190384221
    Abstract: SAW modulators are used as components of diffractive imaging systems. Arrays of the modulators can be used to detect the light field from a scene. In specific applications, they can be used to provide matched filtering for object recognition.
    Type: Application
    Filed: June 12, 2019
    Publication date: December 19, 2019
    Inventors: Gregg E. Favalora, Juha-Pekka Laine, Joseph J. Register, Dennis M. Callahan, Jr., Ian Ward Frank
  • Publication number: 20180341127
    Abstract: A system and method for improving spatial light modulator (SLM) devices such as Surface Acoustic Wave (SAW) modulators are disclosed. The SAW modulators can improved angular bandwidth and suppress unwanted diffractive orders. In one example, a coating layer(s) is applied to a proximal face of the SAW modulator to improve coupling of guided modes into leaky modes. Additionally, applying coating layers(s) such as a hybrid anti-reflective/highly reflective coating to an exit face of the SAW modulator can suppress transmission of undesired diffractive order(s).
    Type: Application
    Filed: May 25, 2018
    Publication date: November 29, 2018
    Inventors: Ian Ward Frank, Jeffrey A. Korn, Steven J. Byrnes, Dennis M. Callahan, JR.
  • Publication number: 20180329271
    Abstract: A system and method for a Surface Acoustic Wave (SAW) spatial light modulator module, or SAW device that provides varying acoustic wave speed are disclosed. The SAW device includes a substrate of a material such as lithium niobate, and a coating layer is applied to the substrate. A SAW transducer of the device is configured to produce SAW signals that propagate with a propagation velocity around an interface between the substrate and the coating layer. The SAW signals couple light signals of a light source into modulated light signals that are emitted from the bottom face and/or edge face of the substrate. In embodiments, a frequency of RF drive signals applied to the SAW transducer in conjunction with the propagation velocity of the SAW signals produces a decrease in a SAW wavelength of the SAW signals as compared to current SAW device systems and methods.
    Type: Application
    Filed: May 10, 2018
    Publication date: November 15, 2018
    Inventors: Ian Ward Frank, Dennis M. Callahan, JR., Steven J. Byrnes, Michael Gerhard Moebius, Gregg E. Favalora