Optical EngineeringOptical Materials & Infrared Optical cut-off depth OD - key performance indicator of optical filters

Optical cut-off depth OD – key performance indicator of optical filters

Optical filters are indispensable components in optical systems, used to select light of a specific wavelength or block unwanted light. Among the performance parameters of filters, cut-off depth (Optical Density, OD value) is a crucial indicator, which directly determines the filter’s ability to block non-target…

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Filters & CoatingsOptical Engineering GIAI invites you to participate in the 2025 APE Asian Optoelectronics Expo

GIAI invites you to participate in the 2025 APE Asian Optoelectronics Expo

Together we will create a photoelectric future – Invite you to attend the 2025 APE Asia Photoelectric Expo Dear domestic and foreign customers, partners and fellow optoelectronics enthusiasts:In this era of rapid technological development, optoelectronic technology, as a key force in promoting global industrial upgrading…

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Optical EngineeringOptical Materials & Infrared What is a long-pass filter and how wide is its application range?

What is a long-pass filter and how wide is its application range?

In the field of optics, optical filters are endowed with unique optical properties through their special construction materials and film materials, and different optical filters have different actual performance. Today we will talk about a classification of cut-off filters, long-wave pass filters. Among various types…

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Optical EngineeringOptical Materials & Infrared What is an infrared filter?

What is an infrared filter? What instruments are they used on?

Infrared filters, as a specially designed optical device, allow infrared light within a specific wavelength range to pass through while blocking other wavelengths of light, especially visible light and ultraviolet light. The working principle of this filter is based on the selective absorption and transmission…

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