Patent ID: 8723073
Filing Date: 2014-05-13
Classification: B23K,G02B,H01S

Abstract:
1. An illuminating apparatus configured to illuminate a sample when the sample is in a work stage, the illuminating apparatus comprising: a beam shaping optical system configured to shape a laser beam into a line-shaped laser beam having a dimension in a first direction that exceeds a dimension in a second direction perpendicular to the first direction, the laser beam being emitted during use by a laser source and propagating through the illuminating apparatus along a beam path, the beam shaping unit comprising a homogenizer configured to homogenize the laser beam at least along the first direction; an energy measuring device configured to measure an energy of the line-shaped laser beam; and an energy control system configured to generate a control signal based on the measured energy of the laser beam, the energy control system being configured to control energy output of the laser source and/or transmission of one or more components of the beam shaping optical system based on the control signal, wherein the energy measuring device is in the beam path between the homogenizer of the beam shaping optical system and the work stage.