Solid-State Laser With Superfluid Liquid He Cooling
Original Publication Date: 1979-Dec-01
Included in the Prior Art Database: 2005-Feb-20
The efficiency of a tunable IR solid-state laser, like a color center laser, increases with decreasing temperature. Therefore, the sample crystal is immersed directly into a superfluid helium (He) bath. Below the lambda point the thermal conductivity of He is practically infinite. Heat generated in the laser crystal by optical pumping is carried away most effectively. The temperature is not raised at the crystal liquid interface. The cooling bath stays completely quiet. and it does not deteriorate the optical properties of the laser cavity.