Spectroscopy denotes methods where the interaction of light with matter is utilized. In many cases, lasers are used as light sources for spectroscopy, which is then called laser spectroscopy. Laser spectroscopy can be understood to use laser-like sources, including not only real lasers, but also optical parametric oscillators or the outputs of other nonlinear frequency conversion devices such as frequency doublers or difference frequency mixers. The ability to control laser wavelength and pulse duration precisely has proved invaluable for fundamental research in physics and other sciences. Lasers have been particularly important in spectroscopy, the study of the light absorbed and emitted when atoms and molecules make transitions between energy levels, which can reveal the inner workings of atoms.
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