Infrared: Pagkakaiba sa mga binago

Ang mga [[leyser]] (''laser'') ay ginagamit upang makapagbigay ng liwanag na para sa mga sistema ng komunikasyong may [[hiblang optikal]] (pibrang optikal). Ang liwanag na inprared na may liboyhabang nasa bandang 1,330 nm (pinakamababang pagkalat o pinakakaunting dispersyon) o 1,550 nm (pinakamahusay na transmisyon) ang pinakamahusay na pili para sa pampamantayang mga hiblang [[silika]].

 

 

Each chemical bond in a molecule vibrates at a frequency which is characteristic of that bond. A group of atoms in a molecule may have multiple modes of oscillation caused by the stretching and bending motions of the group as a whole. If an oscillation leads to a change in [[dipole]] in the molecule, then it will absorb a [[photon]] which has the same frequency. The vibrational frequencies of most molecules correspond to the frequencies of infrared light. Typically, the technique is used to study [[organic compound]]s using light radiation from 4000–400 cm⁻¹, the mid-infrared. The spectrometer records all the frequencies of absorption in a sample. This can be used to gain information about the sample composition in terms of chemical groups present and also its purity (for example a wet sample will show a broad O-H absorption around 3200 cm⁻¹).