A novel dual filtering mechanism for laser safety eyewear with polycarbonate lens coated by zirconium dioxide and silicon dioxide.

In laser safety eyewear, due to the lack of complete blocking of ultraviolet and infrared rays, we proposed a structure based on one-dimensional multilayer composed of several layers of silicon dioxide and zirconium dioxide materials alternately behind polycarbonate lens. It is find out that the acceptance angle range to the photonic crystal is 0 to 39°. This incident angle range corresponds to the band gap of the photonic crystal. In the transverse electric polarization, with increasing incident angle, the width of the gap rises, while in the transverse magnetic polarization decreases. Our results show that in the transverse electric mode, the optical density gradually increases with increasing angle while it decreases in the transverse magnetic one. The higher optical density, the higher eye protection at specified wavelength. If the incident wavelength is placed in the band gap region, the field intensity gradually decays. Therefore, the proposed structure for laser safety eyewear can provide the maximum reflection on the surface of the lens. Our supposed structure for safety eyewear can be used in infrared lasers.