Patent ID: 8134099
Filing Date: 2012-03-13
Classification: B23K,B28D,C03B,H01L,Y10T

Abstract:
1. A laser working method for irradiating a plate-shaped object to be processed with a laser light while locating a converging point within the object, so as to form a modified region serving as a starting point for cutting along a line to cut the object, wherein a reflection spatial light modulator, which modulates the laser light, a converging optical system, which converges the laser light modulated by the reflection spatial light modulator inside the object, and an adjustment optical system, which has a first optical element and a second optical element functioning as lenses and located on the optical path between the reflection spatial light modulator and the converging optical system are prepared the first optical element and the second optical element are disposed such that a distance between the reflection spatial light modulator and the first optical element becomes a first focal distance of the first optical element, a distance between the converging optical system and the second optical element becomes a second focal distance of the second optical element, a distance between the first optical element and the second optical element becomes a sum of the first focal distance and the second focal distance, and the first optical element and the second optical element becomes a double telecentric optical system at the time of forming the modified region, the laser light is modulated by a reflection spatial light modulator such that aberration of the laser light occurs at a position on which a converging point of the laser light is located inside the object becomes a predetermined aberration or less.