Topics - LASER light
When an atom becomes ‘excited and, while excited, is struck by a photon, the atom releases another identical photon having the same wavelength and direction as the incident photon. The generation of light photons in this way is called stimulated emission. The two photons, so produced, on collision with other excited atoms can then continue the process and produce two further photons. All the photons produced in this way are identical (wavelength, polarization etc.). The process is called light amplification by stimulated emission of radiation or LASER
. In chromatography, LASER’S are used as light sources in light scattering detectors, thermal lens detectors and in LASER desorption ionization techniques for gas chromatography/mass spectrometry.