抄録
We developed a flash lamp-pumped Nd:YAG laser with 2 J, 50 Hz for a laser-hammering method that
inspects tunnel-lining concrete. A simple and compact laser system with a thermal lens effect was
compensated by an adjustment of the image tube with high impact resistance and stability. As a result of
a 1.5-month outdoor practical test, this laser system was shown to be available for maintenance-free
operation.
