| 摘要 |
A laser apparatus and a method for generating harmonic beam are provided to generate a high-output harmonic beam with a simple method without increasing an output of a laser and high technology. A laser apparatus includes a SHG(Second Harmonic Generation) crystal unit(50) and an optical transmission unit. The SHG crystal unit converts a primary beam having a primary frequency to a beam having secondary harmonic frequency by passing the primary beam therethrough. The optical transmission unit is directed to face the SHG crystal unit for transmitting the primary beam twice on an optical path through SHG crystal unit and transmitting the primary beam and secondary harmonic beam on the optical path.
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