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What are the advantages of optical filter?
2020-06-19 09:16:39

Optical filter is made of plastic or glass and added with special dye. Red filter can only let red light pass through, and so on. The transmissivity of glass sheet is similar to that of air. All color light can pass through, so it is transparent. However, after dye, the molecular structure changes, and the refractive index also changes, and the passage of some color light changes. For example, a white light passing through a blue filter emits a blue light, while the green light and red light are very few, most of which are absorbed by the filter.


optical filter


The characteristics of optical thin films are as follows: the surface is smooth, the interface between the films is geometrically divided; the refractive index of the film can jump on the interface, but it is continuous in the film; it can be transparent medium or it can be. Absorption medium; it can be normal uniform or normal inhomogeneous. The practical films are much more complex than the ideal ones. This is because: the optical and physical properties of the film deviate from the bulk material, and the surface and interface are rough, which leads to diffuse scattering of light beam; the diffusion interface is formed by mutual penetration between the film layers; the anisotropy of the film is formed due to the growth, structure, stress and other reasons of the film; the film has complex time effect.

The filter can attenuate the light intensity, change the spectral composition or limit the optical parts of the vibration surface. One of the common features of filters is that no filter can make the image of the celestial body brighter, because all filters will absorb certain wavelengths, making the object darker.

The filter is made of plastic or glass and added with special dye. The red filter can only let the red light pass through, and so on. The refractive index of glass sheet is similar to that of air. All color light can pass through, so it is transparent. However, after dye, the molecular structure changes, the refractive index also changes, and the passage of some color light changes. For example, a white light passing through a blue filter emits a blue light, while the green light and red light are very few, most of which are absorbed by the filter.

If the filter wavelength is 520nm, its light absorption to 520nm wavelength is large, and the absorption to 520nm wavelength light decreases with the increase or decrease of wavelength, which depends on the half wave width of the filter, which is more than twice of the half wave width, so the light is not absorbed and can pass through completely.


KEY WORDS

Optical Window,Optical Protective Window,Optical Prism,Optical Lens,Prism,Spherical Lens,Band Pass Filter,Laser Lens

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