Neutral Density Filter
Neutral-density filters attenuate intensity without changing spectral energy distribution, using durable metal coatings for uniform broadband attenuation. 同生科技 offers complete manufacturing/testing, quality optics, a full range, advanced technology, good service, reasonable prices and custom substrates, dimensions, specifications, wavelengths/transmission. Common forms are circular-variable and linear-variable filters. Rotating a circular filter linearly varies attenuation within a sector for precise adjustment around the circle. Counter-rotating two filters gives fixed-density attenuation over a larger limited area. Sizes are 25–100mm; spectral range is 250–2500nm; custom size/density/wavelength is available. Translating a linear filter or light source varies attenuation along its length. Metal-alloy and low-reflection GND types are offered. Oppositely translating two filters attenuates larger spots. They suit ordinary/laser sources over 250–2500nm, with custom sizes/densities/wavelengths.
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