Journal
COATINGS
Volume 11, Issue 12, Pages -Publisher
MDPI
DOI: 10.3390/coatings11121513
Keywords
notch filter; electron beam evaporation; ion-assisted deposition; surface roughness; residual stress
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A new laser protective lens based on a multilayered notch filter design with low residual stress and low surface roughness has been developed. The experimental results show that the optical transmittance meets the design requirements, with a transmittance of 0.2% at the center wavelength and an average transmittance of 70% in the transmission band.
We present a new laser protective lens based on a multilayered notch filter design with low residual stress and low surface roughness. An18-layer notch filter was prepared by electron beam evaporation with an ion-assisted deposition technique, which was composed of SiO2 and Nb2O5 with a center wavelength of 532 nm. The optical transmittance, residual stress, surface roughness, and surface morphology were measured by a UV/VIS/NIR spectrophotometer, Twyman-Green interferometer, scanning probe microscope, Linnik microscopic interferometer, and field-emission scanning electron microscopy (FE-SEM). The transmittance of the notch filters at center wavelength is 0.2%, and the average transmittance of the transmission band is about 70%. The residual stress of the notch filter is -0.298 GPa, and the root mean square surface roughness is 1.88 nm. The experimental results show that the optical transmittance meets the design requirements.
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