LD-PUMPED SOLID-STATE LASER SYSTEM AND ITS OPERATING METHOD

摘要

PROBLEM TO BE SOLVED: To provide an LD-pumped solid-state laser system that is put with a driving current limit for preventing the breakage of an LD, can control constantly its output power without requiring manual adjustment on an LD driving current or the limit value of a current even when the LD is deteriorated with time or a temperature variation occurs, and can automatically notify the exchange of the LD when the LD is deteriorated by outputting an alarm.;SOLUTION: A feedback circuit constituted of a control gain 12, the LD 2, a power monitor 4, and a feedback gain 14 constantly controls the output power of the LD-pumped solid-state laser system. When the output power of the laser system changes from its initial state due to the deterioration of the LD and the output range of the LD driving current for outputting constant output power exceeds an initial limit, a differentiation circuit 15 makes the constant control of the output power continuable by automatically adjusting the limit value of a current limiter 13. In addition, when the deterioration of the LD progresses and the adjustment of the limit value becomes impossible, the differentiation circuit 15 indicates the exchange of the LD by outputting the alarm.;COPYRIGHT: (C)2004,JPO&NCIPI