What Are Optical Filters?

With the continuous advancement of technology, optical filters are playing an increasingly vital role in the electronic components industry. This article aims to provide you with a detailed insight into the definition, working principles, types, characteristics, advantages, and applications of optical filters.

I. What are Optical Filters?

Optical filters are devices designed to selectively transmit, reflect, or block light of different wavelengths. Typically implemented as glass planes or plastic devices in the optical path, they are either dyed in the bulk or equipped with interference coatings. The optical properties of filters are fully described by their frequency response, which specifies how the magnitude and phase of each frequency component of an incoming signal are modified by the filter.

II. Working Principles

The working principles of optical filters are based on the absorption, transmission, and reflection of light. Depending on their type and design, optical filters can achieve wavelength selectivity by absorbing light of non-target wavelengths, transmitting light of target wavelengths, or reflecting light of non-target wavelengths.

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