In the field of optics, optical filters play a crucial role in manipulating light. They are widely used in various applications, from scientific research to everyday devices such as cameras and display screens. Understanding the principle and characteristics of optical filters can help us better…
In the field of optics, optical filters play a vital role. They can selectively transmit or block light in a specific wavelength range and are widely used in many fields such as photography, scientific research, and optical communications. In order to better understand and select…
For a symmetric all-dielectric filter on a non-absorbing substrate, used near normal incidence at low optical power, flipping the part does not change the transmitted spectrum. Transmittance through a non-absorbing multilayer is the same in both propagation directions at the same angle of incidence. Optical…
Optical filters are indispensable components in optical systems, which optimize optical performance by selectively transmitting or blocking specific wavelengths of light. Driven by modern technology, the types and functions of optical filters are constantly expanding, and their applications have penetrated into many fields such as…
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…
From May 14 to 16, 2024, the 16th German Optoelectronics Laser Exhibition Optatec 2024 officially opened. As a trade exhibition, the three-day Optatec 2024 will bring together optical enthusiasts from different industries and many countries. This highly specialized leading event involves optical technology, image processing,…
The practical difference between OD4 vs OD6 optical filter blocking is a factor of 100 in transmitted unwanted light. OD4 permits a maximum transmittance of 10-4, or 0.01%, while OD6 corresponds to 10-6, or 0.0001%. That difference can be important when a detector must separate…
A machine vision system may use an 850 nm or 940 nm LED, a monochrome camera with good near-infrared sensitivity, and stable exposure settings—yet still produce images whose contrast changes with factory lighting, sunlight, or reflections from nearby equipment. The problem is often not the…
Choosing a narrow bandpass filter manufacturer comes down to three questions: can their coating process hold your center wavelength tolerance across the full clear aperture, do they measure the filter under your actual angle and cone conditions, and is the blocking specification real across your…
From February 26 to 28, 2025, the Asia Photonics Expo (APE 2025) will be held in Hall L1 of the Sands Convention and Exhibition Center in Singapore! As the top event in the optoelectronics field in the Asia-Pacific region, this exhibition focuses on cutting-edge fields…
A machine vision filter manufacturer should do more than manufacture a filter around a nominal wavelength. The filter must be evaluated together with the illumination spectrum, camera sensor response, lens geometry, angle of incidence, required blocking range, mechanical integration, and inspection conditions. GIAI Photonics supports…
The 20th anniversary of LASER World in 2025 will be held at Shanghai New International Expo Center (Hall 3, Halls N1-N5, E7-E4) from March 11 to 13! As the largest and highest-level optoelectronics industry event in Asia, this exhibition focuses on cutting-edge laser technology, optical…
