B. Mangote
L. Gallais
M. Commandré
M. Mende
L. O. Jensen
H. Ehlers
M. Jupé
D. Ristau
A. Melninkaitis
J. Mirauskas
V. Sirutkaitis
S. Kicas
T. Tolenis
R. Drazdys

Femtosecond laser damage resistance of oxide and mixture oxide optical coatings

Optics Letters
Type: Zeitschriftenaufsatz (reviewed)
We report on the laser damage resistance of ion beam - sputtered oxide materials (Al2O3, Nb2O5, HfO2, SiO2, Ta2O5, ZrO2) and mixtures of Al2O3-SiO2, Nb2O5-SiO2, HfO2-SiO2, Ta2O5-SiO2, and ZrO2-SiO2, irradiated by single 500 fs pulses at 1030 nm. Laser-induced damage threshold (LIDT), refractive index, and bandgaps of the single-layer coatings are measured. For pure oxide materials a linear evolution of the LIDT with bandgap is observed. The results are in accordance with our simulations based on photo-ionization and avalanche-ionization. In the case of mixtures, however, deviations from the previous behaviors are evidenced. The evolution of the LIDT as a function of the refractive index is analyzed, and an empirical description of the relation between refractive index and LIDT is proposed.