Highly reflective films play an important role in optical thin films,
Silver, gold, and aluminum reflective filmIt is a commonly used material, and silver plated mirrors have extremely high reflectivity in the visible and near-infrared bands, making them very suitable for applications such as femtosecond lasers.
1、 Characteristics of Silver Plated Film Reflectors
Silver plated film reflector is a type of mirror
Light reflective thin film materialIt is composed of a silver (alloy) reflective film layer, a substrate film, and a protective layer for the reflective film layer. Its characteristics are as follows:
High reflectivity: Silver coated mirrors have extremely high reflectivity in the visible and near-infrared bands. In the range of 450-2000nm, the average reflectivity exceeds 97.5%, which is the highest reflectivity among all metal mirrors. Within the frequency range of 2-20um, the average reflectivity exceeds 96%.
Protective layer: To prevent oxidation and scratching of the silver plated reflective mirror, the outermost layer is generally coated with a 100nm thick SiO2 film layer. This protective layer not only prevents oxidation, but also increases the strength of the mirror and prolongs its service life.
Customization: Silver plated reflective mirrors can provide customization of square or circular lenses. According to actual needs, mirrors that conform to specific shapes and sizes can be made.
2、 Reflectors applied in high-tech fields
Due to its high reflectivity in the visible and near-infrared bands, silver coated mirrors are widely used in high-tech fields. Here is a typical application:
Femtosecond laser: Femtosecond laser is a type of laser that can generate extremely short pulses with a pulse width in the femtosecond range (10 ^ -15 seconds). Silver coated mirrors have high reflectivity in the range of 450 nm-20 µ m, making them ideal for use in femtosecond lasers, effectively reflecting laser light and providing high-quality output.
3、 Precautions and usage suggestions
Although silver coated mirrors have the characteristic of high reflectivity, due to the relatively soft silver film, it is easy to scratch and oxidize. Therefore, the following precautions should be taken during use:
Avoid high humidity environments: High humidity environments can easily cause oxidation of silver plated mirrors, affecting their reflectivity. Therefore, in environments with high humidity, it is advisable to avoid using silver plated mirrors or take corresponding protective measures.
Be careful when wiping: To protect the surface of the reflector, be careful when wiping. Wipe with a clean, soft cotton cloth and avoid using substances that are corrosive or may scratch the reflector.
Summary:Silver plated film reflectorIt has extremely high reflectivity in the visible and near-infrared bands, and its characteristics include high reflectivity, protective layer, and customization. In the high-tech field, silver coated mirrors are widely used in devices such as femtosecond lasers. During use, attention should be paid to avoiding high humidity environments and careful wiping to protect the service life of the silver plated reflective mirror.
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