Bandpass Filter

MULTI IR Visible Light—Bandpass Filter is a high-performance optical filter product designed specifically for accurately selecting specific bands of visible light. Its core function is to allow only a specific wavelength range within the 400-760nm visible light range (such as 450-470nm blue light band, 520-540nm green light band, 620-640nm red light band) to pass through efficiently, and achieve deep cutoff of stray light outside the band (including ultraviolet light, infrared light and other non-target visible light), with core advantages of high wavelength selectivity, high peak transmittance and high cutoff depth. As a typical representative of "Dielectric Filters" in the keyword list, it adopts multi-layer dielectric interference coating technology and high transmittance optical glass substrates (such as K9 glass, quartz glass), with a peak transmittance of up to 90% or more and a cutoff depth (OD value) of up to OD4-OD6, which can effectively suppress stray light interference and ensure the purity of the target light signal.Common wavelengths: 532nm (laser), 650nm, 808nm (laser), 850nm, 940nmPulse oximeter (only transmits red light at 660nm and infrared light at 940nm)Face recognition/liveness detection cameras (e.g., 850nm and 940nm near-infrared bandpass)

The application scenarios of this product cover multiple fields: in the biomedical field, it can match the excitation light and emission light bands of fluorescence imaging equipment, accurately capture the fluorescence signal of biological samples, and assist in cell detection and molecular diagnosis; in the security monitoring field, it can be used in conjunction with infrared fill lights to select specific visible light bands, improving the color reproduction and detail recognition rate of night monitoring images; in the industrial testing field, it is used in machine vision systems to filter stray light interference on the product surface and accurately identify product characteristics such as color and defects; in the astronomical observation field, it can select specific visible light bands to reduce the impact of atmospheric scattered light and clearly observe the specific spectral information of celestial bodies.

In response to the needs of "Industrial Optical Filters" and "Custom Optical Filter", this bandpass filter from MULTI IR supports full-parameter customization: customers can flexibly select the center wavelength, bandwidth (adjustable from a few nanometers to tens of nanometers), cutoff depth and size (minimum up to a few millimeters, maximum customizable to hundreds of millimeters) of the target band according to actual application needs; at the same time, it provides various shape processing such as square, circular and special-shaped, compatible with the installation needs of different equipment such as lens modules, sensors and spectrometers. Whether it is mass-produced consumer electronics supporting or high-precision scientific research equipment customization, it can meet strict optical performance requirements and is a core component in visible light accurate filtering scenarios.