SOLID-STATE LASER LIGHT PROPAGATION DEVICE

摘要

PROBLEM TO BE SOLVED: To obtain a solid-state laser light propagation device by which a beam diameter and diverging angle that is all the same as those at the output point can be precisely transferred to the incident point even if the thermal lens effect varies with oscillation output of the laser light. SOLUTION: Regarding the solid-state laser light propagation device in which the laser light outputted from the output point returns in a U-shape through a pair of returning mirrors is inputted to an incident point, each of the returning mirrors is composed of a first concave mirror 7 and a second concave mirror 8 respectively having the same focal length (f), the first concave mirror 7 is placed in a position separated from the output point by a distance equal to the focal length (f) and the second concave mirror 8 is placed in a position separated from the incident point by a distance equal to the focal length (f) in such a way that the space between the first and second concave mirrors 7 and 8 is set twice as long as the focal length (f).