Selective Absorption Glass Filters

Selective absorption glass filters is a type of glass with special optical properties. It selectively absorbs light within a specific wavelength range while allowing other wavelengths to pass through. Here is a detailed introduction:

Definition and Principle: Selective absorption glass filters is generally produced by adding specific colorants, such as metal ions or colloidal particles, to a glass matrix and adjusting the glass composition and surface coating. These additives cause the glass to selectively absorb specific wavelengths in the visible spectrum. The principle is based on the electronic energy level transitions of the material; when light shines on the glass, the energy of specific wavelengths is absorbed, thus achieving selective light filtering.

Main Types: 

Green Selective absorption glass filters: Precisely doped with transition metal ions such as chromium (Cr³⁺) and copper (Cu²⁺) into a silicate or borosilicate glass matrix, it forms a high transmission peak in the 500-560nm green light band, while simultaneously absorbing blue-violet and red light, resulting in green transmitted light.

Purple Selective absorption glass filters: By adding metal ions or colloidal particles such as manganese, titanium, cobalt, and neodymium, it strongly absorbs light in the mid-wavelength range, such as green and yellow, while allowing purple, blue, and some red light to pass through, resulting in a purple appearance.

UV Transmission Visible Absorption Glass: It can precisely filter out specific wavelengths of ultraviolet light, such as the i-line at 365nm or shorter wavelengths, while effectively filtering out stray visible light components.

Features and Advantages

High Spectral Selectivity: The absorption and transmission wavelength range can be precisely controlled according to needs to meet the specific spectral requirements of different application scenarios.

Stable Performance: It has good chemical stability, mechanical properties, and thermal stability, and can maintain its optical performance under different environmental conditions.

High Design Flexibility: Different colors and optical properties can be achieved by adjusting the glass composition and manufacturing process. Sizes and shapes can also be customized according to customer requirements.

Application Areas

Optical Instruments: Used as filters in fluorescence microscopes, DNA sequencers, spectrometers, and other equipment, providing a pure excitation light source, eliminating interfering light, and improving detection sensitivity and accuracy.

Industrial Applications: Serving as windows or filter components for light sources in semiconductor lithography, UV curing, and other processes, ensuring process accuracy and stability, and reducing damage to substrates caused by heat accumulation or stray light.

Lighting and Display Applications: Used as color filters in stage lighting and photographic lighting to obtain specific colors of cool light while blocking infrared heat radiation, protecting equipment and illuminated objects.

Architecture and Automotive Applications: Used as smart building glass or automotive window glass, reducing the solar heat gain coefficient, decreasing air conditioning load, and providing specific spectral transmittance to create a comfortable indoor environment.

Arts and Decoration Applications: Used in decorative art glass, photographic special effects lenses, etc., creating special visual effects and color atmospheres through their unique color and spectral selectivity.