Patents by Inventor Joseph B. Brown, III

Joseph B. Brown, III 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).

  • Wavelength conversion by quasi phase matching and the manufacture and use of optical articles therefor
    Patent number: 5157754
    Abstract: Articles and process for wavelength conversion are disclosed which use a series of aligned sections of optical materials for wavelength conversion selected from materials having the formula K.sub.1-x Rb.sub.x TiOMO.sub.4 where x is from 0 to 1 and M is selected from P and As and materials of said formula wherein the cations of said formula have been partially replaced by at least one of Rb.sup.+, Tl.sup.+ and Cs.sup.+, and at least one of Ba.sup.++, Sr.sup.++ and Ca.sup.++. The series of sections is characterized with regard to a change in nonlinear optical coefficient, section length, and section .DELTA.k (i.e., the difference between the sum of the propagation constants for the incident waves and the sum of the propagation constants for the waves generated). The sections are selected such that the sum for the series of the product of the length of each section with the .DELTA.k is equal to about 2.pi.
    Type: Grant
    Filed: July 18, 1991
    Date of Patent: October 20, 1992
    Assignee: E. I. Du Pont de Nemours
    Inventors: John D. Bierlein, Joseph B. Brown, III, Carolus J. van der Poel