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Degenerate four-wave mixing (DFWM) is a laser-induced grating technique with potential for measuring concentration and temperature in reactive environments such as flames and plasmas.1,2 The majority of DFWM diagnostic applications have exploited population and polarization gratings as the dominant signal generation mechanism. Under some conditions, DFWM in gases occurs by a thermal-grating mechanism.
© 1994 Optical Society of America
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