Patent ID: 7192425
Filing Date: 2007-03-20
Classification: A61F

Abstract:
1. A laser treatment apparatus comprising: a laser source; an optical guiding body which guides a treatment laser beam emitted from the laser source; an irradiation optical system for irradiating the treatment beam guided by the optical guiding body; a first beam splitter placed in the irradiation optical system to split the treatment beam guided thereto, the first beam splitter having a predetermined polarization dependence such that reflectances are different in P- and S-polarized components of the treatment beam; a depolarizer placed in an optical path between the optical guiding body and the first beam splitter to spatially disturb a polarization state of the guided treatment beam, the depolarizer eliminating a change in the polarization state of the guided treatment beam due to a change in optical guiding state of the optical guiding body; and a first photo-detector which detects output of one of the treatment beams split by the first beam splitter after passing through the depolarizer.