We have developed a new optical system that transforms the circle profile beam generated with near Gaussian intensity distribution by the YAG2ω laser (second harmonics of a Q-switched Nd:YAG laser) into a line-profile beam. This transformed bean has uniform distribution to within 5% in the longitudinal direction, and is about 100 mm long and 40 micron wide. For homogenization in the longitudinal direction, we employ a waveguide plate homogenizer. The laser beam is divided by waveguide plates, and the divided beams are overlapped on the surface of the works. We successfully reduced interference fringes by increasing the fixed optical pass difference beyond the inherent time and coherent length for every divided pair of adjacent beams under a controlled space coherent length. In the width direction, the laser beam is focused up to the limited M2 value.
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