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Infrared fluorescence from CN− defects in alkali halides was first observed by Yang and Luty1. Recently, we have observed lasing in the KBr:CN system. This is the first report of a laser operating between pure vibrational levels of a defect in a solid. While CN− will fluoresce at high temperatures, (up to 500 K), lasing is only observed at temperatures below 4 K. This is due to the nature of the pumping.
© 1984 Optical Society of America
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