LD pumped intro-cavity OPO high repetition frequency 2 μm laser

The development and application background of 2 μm laser were summarized. Two schemes to obtain 2 μm laser were compared and the indirect tunable scheme was adopted.After LD pumped intra-cavity KTP OPO being adopted, the pump peak value power density was increased and high repetition frequency of 2 μm laser was implemented easily. With KTP crystal cut under specifically angle and OPO resonator designed reasonably, 2 μm laser output efficiency was improved effectively. 2 μm laser experiment was performed, and 11.2 W of 2 μm laser output was realized．