Calculate the thickness of optical glass film

We already know that the transmittance is related to the refractive index of the coating, but not about its thickness. However, if we can work hard on the thickness of the coating, we will find that the difference between reflected light a and reflected light B is NC × Optical path difference of 2D. If

nc × 2D=(N+ 1/2) λ Where n = 0,1,2,3,4,5 λ Is the wavelength of light in the air

It will cause the reflected light of this specific wavelength to have the effect of cancellation, so the color of the reflected light will change.

Optical coating machine

Optical coating machine

For example, if the thickness of the coating causes the cancellation of green light, the reflected light will appear red. Many telescopes on the market that look like red lenses are made based on this principle. Nevertheless, the transmitted light does not turn red.

In many complex optical systems, the suppression of reflected light is a very important lesson. Therefore, between a group of lenses, different coating thickness will be used to eliminate the reflected light of different frequencies. Therefore, the more advanced the optical system, the more colors of reflected light will be found.

the thickness of optical glass film

 

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Hanzhong Brisun Optics Co., Ltd. Is the high precision optical element manufacturer provides customized production of Various optical lenses, including spherical lens, cylindrical lens, optical window, mirror, prism, filter, metal base mirror and other high-precision optical elements. The base materials include various optical glass, fused quartz, calcium fluoride (CaF2), zinc selenide (ZnSe), germanium (GE), silicon (SI), sapphire, metal and other materials. And provide antireflective film, high reflection film, spectroscopic film, metal film and other optical coatings.

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