Andover Dichroic Filters

A dichroic filter is an optical component that uses thin-film interference to selectively transmit specific wavelengths of light while reflecting others. Unlike traditional absorption filters, dichroic filters reflect unwanted wavelengths, resulting in higher efficiency and durability.

Traditional color filters absorb unwanted wavelengths, which can lead to heat buildup and reduced lifespan. Dichroic filters, on the other hand, reflect these wavelengths, offering superior thermal stability, sharper spectral transitions, and longer operational life.

Andover Corporation provides:

• Additive Color Filters: Transmit primary colors (red, green, blue) for applications like color imaging.

• Subtractive Color Filters: Transmit secondary colors (cyan, magenta, yellow) for precise color control.

• Reflective Filters: Designed for beam-splitting applications, reflecting specific wavelengths at designated angles.

Dichroic filters are utilized in:

• Fluorescence microscopy: To separate excitation and emission wavelengths.

• Machine vision systems: For color sorting and inspection.

• Projection systems: To combine or separate color channels.

• Architectural and stage lighting: For vibrant color effects.

• Astronomical instruments: To isolate specific spectral lines.

The spectral properties of dichroic filters can shift with changes in the angle of incident light. As the angle increases, the transmitted and reflected wavelength bands may shift, which is crucial to consider in optical system design.

Yes, Andover Corporation offers custom dichroic filters tailored to specific wavelength ranges, angles of incidence, and environmental conditions, ensuring optimal performance for specialized applications.