Neutral density attenuation film filter attenuation ratio

Neutral density attenuation sheets are like sunglasses, protecting the eyes from strong light stimulation by absorbing excess light energy. Fiber optic attenuation sheets can work in a specific wavelength range like sunglasses to protect optical fibers. The standard for a good fiber optic attenuation sheet is to absorb additional optical fibers instead of reflective fibers, because in fiber optic communication, it is necessary to use lower optical power without damaging the fiber optic attenuation sheet.

Neutral density attenuators based on the absorption of light by metal ions have developed into attenuation fibers containing mixed metal ions. Like ordinary fibers, this type of attenuation fiber has a fixed attenuation coefficient per kilometer, but this attenuation coefficient is not calculated in kilometers, but in millimeters. Insert the attenuation fiber into the ceramic plug and make it into a specially processed yin-yang fixed attenuation plate.

The neutral density attenuator adopts solid-state optical attenuation technology. The adjustable optical attenuator in the form of air isolation absorbing glass adopts mechanical methods to achieve adjustable attenuation. At present, there are also a small number of solid-state light attenuation technologies, such as adjustable diffraction grating technology, MEMS technology, liquid crystal technology, magneto-optical technology, planar optical waveguide technology, etc.

Neutral density attenuation film has a wide range of applications, including optical digital cameras, ultraviolet measuring instruments, cameras, various lasers, various optical instruments and equipment, optical communication attenuation filters, and so on.

Explanation of attenuation band of attenuation film:

1. UV band: attenuation of 20% and 50% from 250nm-380nm;

2. Visible light band (VIS): attenuation of 99%, 90%, 80%, 70%, 50%, 30%, 20%, 10% from 400nm to 700nm;

3. Visible and near-infrared bands (Vis+NIR): 400nm-1000nm attenuation: od=0.5, od=1, od=2, od=3, od=5, od=10, od=20, od=30;

4. Optical communication bands: 1200 nm, 1310 nm, 1550 nm, with transmittance of 70%, 20%, 50%, 1%, etc.