The absorption of photons results in the (*) spontaneous emission of incoherent radiation that competes with the collimated and coherent radiation produced by stimulated emission in these devices.
These devices are the only suitable source for Raman spectroscopy. They can come in four- level and three-level varieties depending on how much pumping energy is required to excite particles to a metastable state and produce a population inversion. The absorption of photons results in the (*) spontaneous emission of incoherent radiation that competes with the collimated and coherent radiation produced by stimulated emission in these devices. For 10 points, name these devices that produce high intensity, monochromatic radiation through light amplification.
These devices are the only suitable source for Raman spectroscopy.
lasers [or Light Amplification through Stimulated Emission of Radiation]