Method and structure for impingement cooling a laser rod

摘要

The apparatus includes a laser rod (12), e.g. solid YAG material, with a longitudinal axis surrounded by inner (24) and outer (28) sleeves. The space between the inner and outer sleeves forms a fluid channel through which coolant is introduced via input ports (32), filling the fluid channel between the sleeves. Evenly distributed small jet holes (38) are provided through the inner sleeve to allow the coolant to spray through to the laser rod operating at a high power density. After the coolant has impinged perpendicularly on the laser rod, it is drawn off through coolant outlet ports (36), dissipating heat from the rod.