Dichroic Filters

Description

Introduction of Bote Dichroic Filters

Dichroic filters consist of a thin-film dielectric coating on glass that exhibits a sharp transition between transmitted and reflected wavelengths.

Dichroic filters are similar to traditional interference filters but differentiate themselves by reflecting all unwanted wavelengths. Therefore, our dichroic range also offers minimal absorbance properties.

Our dichroic filters are available in longpass, shortpass, bandpass, bandstop and color corrected types over a wide range of wavelengths. Dichroic short-pass and long-pass filters can also act as hot and cold mirrors respectively.

Dichroic filters can divide natural light of a certain wavelength into two parts, one part passes through, and the other part is reflected or absorbed. Filters that allow longer wavelengths of light to pass are called long-pass filters, and filters that allow shorter wavelengths of light to pass are called short-pass filters.

Dichroic Meaning

Dichroic refers to materials or coatings that selectively transmit or reflect light based on wavelength. Common in optics, dichroic filters split light into specific colors for applications like cameras, projectors, and lighting. These coatings enable precise color control, enhancing performance in scientific, industrial, and artistic fields.

Dichroic Coating

Dichroic coating is a thin-film optical process that uses multiple layers of dielectric materials to selectively reflect or transmit specific wavelengths of light. Applied via vacuum deposition, it creates filters with precise color separation and minimal absorption. Widely used in optics, imaging, and display systems.

Types of Dichroic Filters

Dichroic filters come in various types, including:

• Long-pass filters (transmit longer wavelengths),
• Short-pass filters (transmit shorter wavelengths),
• Bandpass filters (allow specific wavelength ranges)
• Notch filters (block specific wavelengths).

They are essential for applications in imaging, spectroscopy, and lighting.

How do Dichroic Filters Work?

Dichroic filters work by using thin-film interference. Multiple dielectric layers are deposited on a substrate, causing specific wavelengths to constructively or destructively interfere. This selectively transmits or reflects light based on its wavelength, enabling precise color separation for optical and imaging applications.