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The power scalability of solid-state rod lasers in general is limited by the thermally induced mechanical stress approaching the fracture stress of the laser material. In conventional end-pumped lasers, the spatial heat-generation density profiles follow a nearly exponential law, resulting in a reduction of the maximum possible pump power when compared with a transversally pumped rod of the same length...
A method for scaling end-pumped rod lasers to high output powers by employing multi-segmented crystals is presented and the optimum lengths and absorption coefficients for the segments are given.
A method for scaling end-pumped rod lasers to high output powers by employing a crystal with a hyperbolic dopant concentration profile is presented. An output power of 187 W with 53% optical-to-optical efficiency has been demonstrated.
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