Patents by Inventor Xin H. Chen

Xin H. Chen 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).

  • Quasi-phased matched optical waveguide frequency conversion element having a ferroelectric liquid crystalline material exhibiting a periodic structure
    Patent number: 5335303
    Abstract: An optical frequency conversion element has a wave-guiding layer which consists of a .chi..sup.(2) -active ferroelectric liquid crystal. The monomeric or polymeric liquid crystal material has a periodic structure which permits the so-called quasi phase matching of a guided laser beam. The period length of the structure is equal to twice the coherence length l.sub.c =.pi./.DELTA..beta. of the material, whereby .DELTA..beta.=.beta..sub.o (2.omega.)-2.beta..sub.o (.omega.), with .omega.=angular frequency of the fundamental wave, 0=zero-order mode and .beta.=propagation constant of the mode.
    Type: Grant
    Filed: August 5, 1993
    Date of Patent: August 2, 1994
    Assignee: Hoffmann-La Roche Inc.
    Inventors: Richard Buchecker, Xin H. Chen, Jurg Funfschilling, Rolf-Peter Herr, Martin Schadt, Klaus Schmitt