The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 05, 1982
Filed:
Jun. 19, 1980
Gary C Bjorklund, Los Altos, CA (US);
David M Bloom, Menlo Park, CA (US);
Paul F Liao, Fair Haven, NJ (US);
Bell Telephone Laboratories, Incorporated, Murray Hill, NJ (US);
Abstract
An apparatus utilizing four-wave degenerate mixing detects birefringence in irregularly shaped objects (6). Laser radiation (120) having a specified polarization is brought to a focus and then sent through the irregularly shaped object. The emerging radiation impinges upon a nonlinear material (8) to form a conjugate beam by means of four-wave degenerate mixing. The conjugate beam, which passes back through the object, is picked off and detected at a replica of the focus point. The detector (10, 11 and 12) includes a polarization detector (10) which is arranged so that a signal is detected only when the object has birefringence.