Intravolume diffractive optical elements

G - Physics – 06 – F

Patent

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G06F 17/50 (2006.01) B23K 26/00 (2006.01) G02B 5/18 (2006.01) G02B 5/32 (2006.01) G03H 1/08 (2006.01) G06F 19/00 (2006.01)

Patent

CA 2420370

A method of producing in a solid transparent material, a diffractive optical element for the transformation of an incident wave in a predefined manner, by developing a mathematical model of the element in terms of the required transformation, then using that model for determining a set of points which form the desired diffractie optical element, and then focusing a pulsed laser beam sequentially onto the points in the set, such that it causes optical breakdown damage at those points. Numerical solutions for determining the positions of the set of points from the mathematical model are presented. The production of number of elements for specific applications is described. Complete laser systems capable of monitoring the production of the points in real time according to the results obtained by diffraction of the incident wave by the element under production.

La présente invention concerne un procédé de production d'un matériau solide transparent, un élément optique de diffraction destiné à la transformation d'une onde incidente d'une manière prédéfinie. Ce procédé consiste à élaborer un modèle mathématique de cet élément en termes de cette transformation requise, puis à utiliser ce modèle de façon à déterminer un ensemble de points qui forment l'élément optique de diffraction recherché, puis à concentrer un faisceau laser pulsé de façon séquentielle sur les points de cet ensemble, de sorte qu'il entraîne des dommages de rupture au niveau de ces points. Cette invention concerne aussi des solutions numériques permettant de déterminer les positions de cet ensemble de points à partir de ce modèle mathématique, ainsi que la production d'un certain nombre d'éléments destinés à des applications spécifiques. Cette invention concerne enfin des systèmes laser complets capables de surveiller la production de ces points en temps réel en fonction des résultats obtenus par la diffraction de l'onde incidente à l'aide de l'élément en cours de production.

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