At the electronics level, each composition of the optical fiber material, the energy level difference between the different electronic rail domain determines whether the optical fiber material can absorb a photon with a specific frequency or frequency band. Most of these photons with specific frequency or frequency band belong to the frequency region with ultraviolet or visible light. This is a mechanism that shows color that shows color.

At the level of atoms or molecules, vibration frequency, accumulation structure, chemical bond strength, etc. These important factors jointly determine the ability of material transmission of infrared, far infrared rays, radio waves, microwaves, and other long waves.

Inside a crystal object, the simple form of vibration. Before designing any transparent optical components, you must first know the nature and restrictions of the material before you can choose the appropriate material. The absorption characteristics of the lattice of any material in the low -frequency area also gives this material a transparent limit for this low -frequency light wave. This is the heating vibration of the atom or molecule, and the result of the coupling between the incident light waves. Therefore, in the infrared frequency region (> 1 micron), each material must avoid these absorption areas caused by the atom or molecular vibration mechanism.

Because of an infrared light wave with a specific frequency, it is just matching. The natural vibration frequency of the atom or molecule of a certain material will selectively absorb the light wave of this specific frequency. Because different atoms or molecules have different natural vibration frequencies, they selectively absorb infrared light waves of different frequencies (or different frequency bands).

Because the frequency of light waves does not match the natural vibration frequency of optical fiber materials, it can cause reflection or transmission of light waves. When the infrared light waves are incorporated into this non -matching fiber material, some energy will be reflected, and the other part of the energy will be transmitted.