In this paper, we demonstrate the temporal dependency of an Er:LiYF4laser on the upper laser level energy transfer upconversion. By spectroscopic measurements and numerical simulations, we calculate a value for this upconversion of 9 × 10-17cm3/s. We also report a 60% higher average output power for short-pulse duration, which is complementary to some earlier findings.
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Wetter et al. (2009) studied this question.
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