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:
Feb. 11, 1997
Filed:
May. 18, 1994
Pierre Tournois, Cagnes S/Mer, FR;
Thomson-CSF, Paris, FR;
Abstract
A dispersive, optical delay line for frequency modulated light wave pulses, especially laser waves, comprises a first optical grating and a second optical grating that are parallel to each other, separated by a distance d and localized with a pitch a on the surface of a material that has an index N and is transparent to light waves. An incident wave .SIGMA. is diffracted at an angle .theta.' greater than the limit angle of refraction by transmission through the first and second optical gratings, the angle of emergence from the second grating being also equal to .theta.'. The values of the parameters N, .theta.', a and d are chosen so that a variation in delay time .DELTA.t.sub.R of the pulse through the line corresponds to a modulation bandwidth .DELTA.f of the pulse in a quasi-linear domain. Application to compression/expansion to obtain high-power or very short laser pulses.