Design and preparation technology of laser protective film window of satellite

In view of the current development of anti-satellite laser weapons, it is urgent to study and develop laser protection technology of satellites to enhance their survival and protection capabilities in space. In this paper, a glass substrate with transparency in the visible to near infrared wavelengths and absorption in middle infrared wavelengths was chosen, and a linear laser protective film was designed on its two sides. A beam splitter was designed on one side of the substrate and could achieve high reflectivity at a 1.315 μm wavelength and antireflection in 0.5~0.8 μm and 1.55 μm wavelength. Dual-band antireflection film was designed on the other side of the glass substrate and could achieve antireflection in 0.5~0.8 μm and 1.55 μm wavelengths. Using ion beam sputtering deposition technology, a laser protective film window was prepared, achieving the transmittance greater than 96% at 0.5~0.8 μm, greater than 98% at 1.55 μm, less than 0.1% at 1.315 μm, 30% at 2.7 μm and 1.1% at 3.8 μm. The experimental results show that this method is effective in the preparation of laser protection windows in the near-visible mid-infrared band and is very important in the protection of the satellite platforms from laser weapons.