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VOLUME 14 (1971) | ISSUE 1 | PAGE 23
Nonlinear Conversion of IR Radiation into Visible Light as a New Method of Absorption Spectral Analysis
A considerable number of recent papers is devoted to the detection of infrared radiation by combining its frequency with the frequency of laser radiation in a nonlinear crystal [1 4]. Such a conversion can be a more sensitive method of observing IR radiation than direct detection with standard IR receivers [5] ·