Fluorescence

Light Sources / 2Laser• Light amplification by stimulated emission of radiation (energy (frompumping) absorption -> photon -> stimulation of absorption -> photon,photon…. -> resonator for long ways)• Medium for amplification can be gas (HeNe, Ar, Kryptone…) or solid state(Al2O3-rubene, corunde, titan-sapphire…)• Can be continuous wave (cw) or pulsed (photonic packages down to fs)PROPERTIES• COHERENT Light: means waves maintain the same phase relationshipwhile traveling• Laser light is also monochromatic (one wavelength) and polarized (Evectorialpropagation in parallel planes)