| 摘要 |
PROBLEM TO BE SOLVED: To improve amplification efficiency using a simple structure. SOLUTION: LD bars 10 and 11 and rod lenses 12 and 13, for exciting the strip of an excitation part Q including the rod light axis of a laser rod 1, are provided, and reflecting mirrors 14 and 15 for transmitting a laser beam A through the strip of the excitation part Q for a plurality of times, for example five times, are provided. |
