Patent ID: 9632320
Date: 2017-04-25
CPC Classifications: G02B,H01L,H01S

Claim:
1. A laser irradiation device comprising: a semiconductor laser oscillator having laser diodes arranged two-dimensionally in fast-axis and slow-axis directions; and a homogenizer to which a laser beam emitted from the semiconductor laser oscillator is incident, and which is configured to condense the laser beam onto a long-length incident region at a surface to be irradiated, wherein the homogenizer divides the laser beam into a plurality of beams with respect to a short-axis direction of the incident region, and superimposes the plurality of divided beams on the surface to be irradiated to cause the superimposed beams to be incident on the incident region, and the slow-axis direction of the semiconductor laser oscillator is inclined with respect to a long-axis direction of the incident region, wherein at an incident position to the homogenizer, a profile of the laser beam shows a maximum value periodically at a pitch P with respect to the fast-axis direction, and when a dimension of a cross-section of the laser beam at the incident position to the homogenizer in the long-axis direction is denoted by L, and an inclined angle between the slow-axis direction of the semiconductor laser oscillator and the long-axis direction is denoted by θ, the inclined angle θ is in a range of 0.5 times to 1.5 times sin