Abstract
The local mode lineshape for substitutional H − ions in CaF 2 shows a broadened, two peak structure when La 3+ co-doping up to 6 mol% is included. Pump-probe measurements of the local mode lifetime show a decrease in the anharmonic decay rate as a function of disorder. This phenomenon appears well correlated with four-wave mixing measurements which display a multiexponential behaviour having long lasting components with a homogeneous dephasing time greater than 90 ps.
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