Patent ID: 9700959
Date: 2017-07-11
CPC Classifications: B23K,G03F,H01L

Claim:
1. A method for irradiating semiconductor material comprising: selecting a region of a semiconductor material layer surface, the region having a region size and shape; creating on the semiconductor material layer surface, using an optical system with variable image magnification, an image of a mechanically variable aperture comprising movable blades defining a beam spot size and a shape of an excimer laser beam whose size and shape are mechanically variable; said image being the closest to the size and shape of the selected region while mechanically variable aperture in its fully open position; mechanically varying the size and the shape of the mechanically variable aperture by moving the movable blades for adjusting the laser beam spot size and the shape, so that the laser beam spot matches the size and the shape of the selected region; and irradiating the region of the semiconductor material layer surface with the excimer laser beam having the adjusted beam spot size and the adjusted shape.