Device for protecting an optical system against excess luminosity

摘要

A device for protecting an optical system against the excess luminosity of an incident light beam. The device forms first and second light beams from an incident light beam. A mirror reflects the first beam which is then guided toward the optical system. The mirror includes a reflecting layer capable of being ablated, at least locally, when it is subjected to high luminous intensity. The second beam initiates the ablation process of the reflecting layer, which is continued and completed by the joint action of the first and second light beams.