Abstract
In this work, the effect of the defect structure and the parameters of antireflection interference coatings based on alternating layers of Nb2O5/Al2O3 and Nb2O5/SiO2 layers on the laser-induced damage threshold of ZGP crystals under the action of Ho:YAG laser radiation at a wavelength of 2.097 μm was determined. Coating deposition was carried out using the ion-beam sputtering method. The laser-induced damage threshold of the sample with a coating based on alternating layers Nb2O5 and SiO2 was W0d = 1.8 J/cm2. The laser-induced damage threshold of the coated sample based on alternating layers of Nb2O5 and Al2O3 was W0d = 2.35 J/cm2. It has been found that the presence of silicon conglomerates in an interference antireflection coating leads to a decrease in the laser-induced damage threshold of a nonlinear crystal due to local mechanical stresses and the scattering of incident laser radiation.
Highlights
Increasing the power and efficiency of mid-IR laser systems remains one of the main problems of modern laser physics and technology, which is conditioned upon the need for such systems when solving many scientific and applied tasks
Designs of interference coatings based on the alternation of Nb2O5 and SiO2 layers and on the alternation of Nb2O5 and Al2O3 layers for ZGP single crystals used in parametric light generators generating radiation in the wavelength range of 3–5 μm when pumped by laser radiation at a wavelength of ~2.1 μm have been developed during the research
The laser-induced damage threshold (LIDT) at a wavelength of the acting laser radiation of 2.097 μm was determined at a pulse repetition rate of 10 kHz and a pulse duration of 35 ns for ZGP single crystals manufactured by LLC “LOC”, which was W0d = 2.23 J/cm2 without antireflection coatings
Summary
Increasing the power and efficiency of mid-IR laser systems remains one of the main problems of modern laser physics and technology, which is conditioned upon the need for such systems when solving many scientific and applied tasks. The contradictory information on the influence of interference coatings on the LIDT of ZGP presented in [16,17] indicates that the different structures of coatings and methods of their deposition on a nonlinear crystal, as well as the choice of the film-forming materials, significantly affects the efficiency of its application in optical parametric oscillators.
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