Abstract
We measured the temporal change of the beam divergence of a copper vapor laser using the saturable absorber DASBTI. The recovery time of the absorption of the DASBTI (∽ 50 ps) is much shorter than the temporal change of the intensity of the copper vapor laser (∽ 20 ns). In this case, the transmissivity is a linear function of the instantaneous intensity. The beam divergence can be derived from the input and output power.
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