A method is introduced for small signal gain measurement in a low-saturation regime using an amplified spontaneous emission (ASE) footprint of a gain media. By this method, the ratio of intensities, with and without a reflector, is measured beside the bandwidth of the ASE, hence two equations are formed. An iterative solution of these equations will simultaneously determine both the small signal gain and the loss.
In this paper we model and design a composite Yb:YAG/YAG hexagonal disk laser. In this edge-pumped thin disk laser
configuration, the pump light incidents from disk edges and propagates through the disk along the zigzag path and
repeatedly passes the gain medium, thus improve the pump uniformity and absorption efficiency. At the first we
calculate the absorbed pump distribution by ray tracing method; secondly with using the fraction of the absorbed pump
density as the heat source, the temperature distribution is simulated by 3D-FEM. Finally the output power is calculated
by solving the quasi-three-level system rate equations. The absorption efficiency, the pump uniformity and temperature
distribution are three effective parameters on the laser system operation. These parameters are investigated and
optimized by this model.
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