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16 November 2018 Femtosecond laser-induced modifications of frequency tripling mirrors
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We have studied laser induced material modification in a frequency tripling mirror (FTM) consisting of alternating hafnia and silica layers. The third-harmonic signal generated by a train of femtosecond laser pulses (791 nm, 55 fs, 110 MHz) drops over time until it reaches about 20% of the initial value. From the observed changes in reflection and transmission of the mirror a refractive index change of 0.07 was estimated, which occurs in the layer with the highest field enhancement. This index change triggers a drop in the field enhancement, which reduces the efficiency of nonlinear optical processes. The estimated value of ▵n allowed us to explain the 80% reduction in conversion efficiency and as well as an observed decrease in two-photon absorption.
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Amir Khabbazi Oskouei, Sebastian Baur, Luke Emmert, Marco Jupe, Thomas Willemsen, Morten Steinecke, Lars Jensen, Detlev Ristau, and Wolfgang Rudolph "Femtosecond laser-induced modifications of frequency tripling mirrors", Proc. SPIE 10805, Laser-Induced Damage in Optical Materials 2018: 50th Anniversary Conference, 108051W (16 November 2018);

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