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:
Jul. 19, 1977
Filed:
Sep. 29, 1976
Robert James Bennett, Carmel, NY (US);
Daniel Richard Grischkowsky, Peekskill, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A dark pulse is manifested when the intensity of a laser beam, for example, a continuous wave laser beam drops to zero and returns to its original intensity in a very short time period. A modulator for producing dark pulse outputs is disclosed which includes a two-photon absorption cell provided with two input laser beams: a continuous wave beam having a frequency .omega..sub.1 and a mode-locked laser beam having a frequency .omega..sub.2 selected such that .omega..sub.1 + .omega..sub.2 = .OMEGA..sub.12 where .OMEGA..sub.12 is also the two-photon absorption frequency of the vapor contained in the cell. The mode locked beam modulates the continuous wave beam to produce the desired dark pulses.