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For high average power lasers with double-end-pumped multi-slab (DEPMS) configuration, a non-uniform gain distribution within each slab caused by the step-doped multi-slab will lead to the amplified spontaneous emission (ASE) effect and then reduce the laser performance. As an example, longitudinal gradient doping is used in a DEPMS Yb:YAG pulsed amplifier to create uniform longitudinal gain (ULG)...
A kind of hybrid algorithm for diffractive optical elements (DOE) design is described. The pure phase plates (PPE) simulated by this method homogeneously concentrate more than 97% of the incident energy into the desired focal-plane region. The intensity focal-plane profile has an almost perfectly flat top. Its fit to the required profile measured by the mean square error is 0.25%.
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