The aggregation density of the filter film layer usually increases with the increase of the filter substrate temperature, so depositing the film at higher temperatures will increase its firmness. The temperature of the substrate has a certain impact on the structure, density, particle size, and stress of the filter film layer. The substrate temperature also affects the internal stress of the film. When the temperature difference between the filter film layer and the substrate is too large, the shrinkage deformation after cooling is inconsistent, resulting in internal stress and causing cracks or detachment of the filter film layer.
Hanzhong Borisun Optics has conducted multiple experiments to verify that as the substrate temperature increases, the reflectivity of the filter film layer increases. However, when some metal films are coated, too high a substrate temperature can actually cause roughness of the filter film surface, leading to light diffusion. But generally speaking, when deposited on a high temperature substrate, the density of the surface facial mask layer of the filter is high, the refractive index is high, and the mechanical strength and chemical stability are good. So when we use different film materials to coat optical coating filters, we should choose the best substrate temperature, so that we can get a solid film and an ideal optical characteristics of the filter. However, selecting the optimal substrate temperature is a complex issue in the coating process of optical components, which must be achieved by combining theory and experiment. So, only by mastering the coating process requirements during the production process can we produce filters that are not easy to peel off and better meet the needs of customers. For filter manufacturers like this, please contact us professionally.