The 1064nm partially reflective coatings has been widely used in high-power laser optical components. The current research status on 1064nm partially reflective coatings is that it is difficult to balance the electric field and spectral tolerance. In order to satisfy both high spectral efficiency and high laser induced damage threshold, we use HfO2 and SiO2 to design and fabricate three kinds of coatings with different electric field distributions. This paper measured the actual spectra of the three coatings and obtained high spectral efficiency. The damage threshold of the coatings is measured by the damage threshold test platform built by the laboratory. The final research results show that when the matching layer is on the side of the substrate, the electric field is lower and the damage threshold of the coatings is higher.
Third harmonic separator has proven to be a critical component in high-power laser systems, which can be used for beam splitting and optical path change of 355 nm laser. It is desirable for the coating to have high spectral efficiency and laser induced damage threshold. Through precise fabrication, the spectrum efficiency can easily meet the requirements with high reflection at 355nm and high transmittance at 532nm and 1064nm. However, the issue is more complicated and quite challenging for obtaining high LIDT, because high refractive index materials tend to have high absorption at ultraviolet, which contribute to a decreased LIDT together with the electric field inside the film. It is significant to investigate the interplay between absorption, electric field intensity and LIDT. In this paper, materials of HfO2 and SiO2 are used to design and fabricate the two third harmonic separator with similar film structure, high spectral efficiency and different electric field distribution by electron beam evaporation. Spectral measurements results show that the prepared samples all have similar spectra with high spectral efficiency. Damage threshold and weak absorption test results show that high intra-film electric field distribution results in higher weak absorption and lower damage threshold. Our research has important reference significance for the design and preparation of high damage threshold third harmonic separator.
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