Device for protecting an optical system against excess...

Details Device for protecting an optical system against excess... Device for protecting an optical system against excess...

G - Physics

02

B

G02B 27/00 (2006.01) G02B 17/06 (2006.01) H01S 3/00 (2006.01)

Patent

CA 2274148

The invention concerns a device for protecting an optical system (2) against the excess luminosity of an incident light beam (FO), comprising means (3) forming first and second light beams (F1, F2), and reflecting means (4), the first beam (F1) being guided towards the optical system (2) after being reflected on the reflecting means (4). The invention is characterised in that the reflecting means (4) is a mirror comprising a reflecting layer (11) capable of being ablated at least locally when it is subjected to high luminous intensity, and the second beam (F2) initiates the ablation process of the reflecting layer (11), which is continued and completed by the joint action of the two light beams (F1, F2).

Un dispositif de protection d'un système optique contre des surintensités lumineuses d'un faisceau lumineux incident, comportant deux pupilles adjacentes séparées pour former des premier et second faisceaux lumineux, et un miroir, le premier faisceau étant guidé vers le système optique après réflexion sur le miroir. Le miroir comporte une couche réfléchissante susceptible d'être ablatée au moins localement lorsqu'elle est soumise à une forte intensité lumineuse, et le second faisceau amorce l'ablation de la couche réfléchissante, qui est poursuivie et achevée par l'action conjuguée des deux faisceaux lumineux.

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