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Since typically low temperatures turn the quasi three level system of Yb:YAG into a four level system much higher efficiencies are expected by cryogenic cooling. Former experiments achieved efficiencies up to 30 % [3], which is below theoretical expectations [1,2]. To increase the efficiency through a better overlap between the pumped area and the seed beam profile, a novel all-reflective relay imaging...
Yb3+-doped gain media are promising candidates for high efficient lasers since they have a broad spectrum, a long fluorescence lifetime, a quantum efficiency close to one and they can be pumped directly by laser diodes. Nevertheless even the heating of those laser media causes problems like thermal lenses, limited average output powers due to thermal destruction and huge cooling efforts. One promising...
It has been shown, that cryogenic cooling of Yb3+-doped media is increasing laser performance significantly[1,2]. The reason for this is the thermal depopulation of the lower laser levels turning the quasi three level extraction scheme into a real four level scheme. By now most of these cryogenic cooled amplifiers aim on liquid nitrogen temperature. For future systems it has to be estimated what is...