Abstract
The generation of far-infrared radiation (FIR) by optically pumping molecular gases was first accomplished by Chang and Bridges in 1970 [1]. They made use of CO2 laser to pump specific vibrationalrotational states of CH3F molecule at low pressure, producing population inversion between rotational levels in the excited vibrational state. The importance of this pumping scheme for obtaining FIR laser lines is due to the existence of a great number of polar molecules with vibrational absorption in the 9–11μm region where the CO2 laser emits, combined with the high efficiency of the CO2 laser pump. So far more than 50 molecules have been found to lase, yielding over 1000 lines in the 5–250 cm-1 spectral range [2] and an intensive search for new and efficient lines is now taking place in several laboratories. A good review of the FIR laser field has been given by Hodges [3].
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Scalabrin, A., Vasconcellos, E.C.C., Cruz, C.H.B., Fragnito, H.L. (1981). Optically Pumped FIR Lasers. In: Guimaraes, W.O.N., Lin, CT., Mooradian, A. (eds) Lasers and Applications. Springer Series in Optical Sciences, vol 26. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-38609-4_24
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DOI: https://doi.org/10.1007/978-3-540-38609-4_24
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