The Difference Between Laser Protective Lenses Of Different Wavelengths

Differences in protective effects
Specific wavelength targeting: Different wavelengths of laser have different hazards to the eyes, and protective lenses need to be designed for specific wavelengths. For example, for the 632.8nm (red light) laser emitted by common helium neon lasers and the 10.6 μ m (far-infrared light) laser emitted by carbon dioxide lasers, the corresponding protective lenses will have different protective mechanisms and material choices to ensure good absorption or reflection effects on specific wavelengths of laser, thereby protecting the eyes from harm.

Protection band range: Some protective lenses may only provide protection for a single wavelength or a narrow wavelength range, while others can provide protection for multiple wavelengths. For example, for semiconductor lasers such as 808nm and 980nm, it is necessary to choose protective glasses specifically designed to prevent semiconductor lasers. These glasses mainly focus on a specific wavelength range of semiconductor lasers; And some lenses that have been specially designed and processed can absorb multiple wavelengths of laser simultaneously with technological development, expanding the range of protection.

Differences in Lens Materials
The protective performance of lenses made of different materials against lasers of different wavelengths varies

Glass material: It has high transmittance, high transparency, and good optical performance, providing a clear field of view. It also has high hardness and wear resistance, and can resist external environmental erosion. But it is sensitive to certain wavelengths of laser, its protective performance may be poor, and it is heavy and fragile. It is generally suitable for protecting some lasers in the visible light band, and is used in scenarios where the protection performance is not extremely demanding and good optical performance is required.

Resin material: lightweight, impact resistant, high transmittance, and relatively low price. It can absorb specific wavelengths of laser by doping absorbers. However, it has poor corrosion resistance and is prone to scratches, requiring regular replacement. It has a good effect on laser protection in some wavelength ranges, especially in situations that require certain flexibility and economy.

Quartz material: It is a high-purity glass material with advantages such as high transmittance, high heat resistance, and high chemical stability. Under the action of high-energy density laser, it exhibits outstanding protective performance for specific wavelengths (such as the wavelength corresponding to high-energy laser), but its price is relatively high, and it is generally suitable for occasions with extremely high requirements for protective performance.

Polycarbonate material: lightweight, high toughness, high protective performance, and affordable price, capable of effectively absorbing or reflecting lasers of specific wavelengths. However, the scratch resistance is relatively poor and requires attention to maintenance and use. It has applications in various wavelengths of protection, especially in scenarios where weight and impact resistance are required.

Difference in transmittance
Transmittance refers to the ratio of the light flux passing through the goggles to the incident light flux. For laser protection of different wavelengths, the transmittance may vary while ensuring the protection effect. For example, in some laser marking work that requires precise operation, protective lenses for the laser wavelength used in this work will have better transmittance, allowing operators to observe the marking position more clearly; For certain wavelengths of laser, due to high protection requirements, it may be necessary to sacrifice a certain amount of transmittance to ensure the protection effect, resulting in a certain impact on the clarity of the scene when wearing protective lenses.