| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a Q switch type fiber laser beam machining device adopting a fiber MOPA (Master Oscillator Power Amplifier) system where the protection of fiber for amplification and the improvement of laser beam machining properties and quality are attained. <P>SOLUTION: The fiber laser beam machining device includes: amplifier fiber 10; a seed laser oscillation part 12; a fiber core excitation part 14; a laser emission part 16; a machining table 18; a control part 20 or the like. The control part 20 applies first pulse killer to an YAG (Yttrium Aluminum Garnet) laser oscillator 22 in the seed laser oscillation part 12 through a Q switch driver 32, and further, to the fiber core excitation part 14, for controlling the output of LD light FB for core excitation, applies a current change control signal CH, a current command value I<SB>w</SB>for waiting, a current command value I<SB>S</SB>for amplification, a build up time command value J<SB>up</SB>or the like to an LD power source 44. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
