Gyrotrons and free electron lasers have recently increased both the power and tunability of, respectively, millimeter wave and infrared sources by several orders of magnitude. As radiation at these wavelengths interact strongly with atmospheric aerosols and trace impurities, these sources have a great potential as atmospheric sensors. They open the possibility of increasing by at least an order of magnitude both the range and sensitivity of these atmospheric sensors.
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Wallace M. Manheimer (1994) studied this question.
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