LASER BEAM IRRADIATION DEVICE FOR LASER BEAM TRIMMING DEVICE AND METHOD OF CONTROLLING LASER PULSE WIDTH

摘要

PROBLEM TO BE SOLVED: To provide a laser beam radiation device for a laser beam trimming device and a method of controlling a laser pulse width, by which device and method the pulse width of a giant pulse is controlled to be kept constant. SOLUTION: In the laser beam irradiation device 10 for the laser beam trimming device, which is provided with a laser oscillator 11 furnished with a Q switch unit 11a, a Q switch driver 13 which drives the Q switch unit, and a control part 15 which drives and controls the Q switch driver, a programmable timer circuit 25 of the control part adjusts the time T2 (=T3-T1) for which the Q switch driver is operated so that the pumping time T1 of the laser oscillator is kept constant independent of the period T3 decided by a Q switch frequency.