Laser diode directly pumped laser system is the most compact approach to achieve high power laser output To obtain high power 209μm laser output Ho doped YAG material is a favorable material due to it

The most compact method of achieving high power laser output is through a laser diode directly pumped laser system. For high power 2.09μm laser output, Ho doped YAG material is preferred due to its low quantum defect and superior thermal stability. Currently, there are two primary methods for achieving high power 2.09μm laser output. The first method involves directly pumping Ho:YAG with a 1.9um LD, while the second method involves directly pumping TmHo co-doped YAG crystal with a 785nm LD. Please review and revise as necessary.