Abstract

The emission spectrum of air that is excited by an ArF laser has been investigated experimentally and theoretically to determine the conditions under which fluorescence from O₂ can be used for the measurement of temperature in aerodynamic flows. In addition to the expected fluorescence from O₂, the spectrum from excitation with an intense laser beam is shown to contain significant contributions from the near-resonant Raman fundamental and overtone bands, the four-photon fluorescence excitation of C produced from ambient CO₂, and possibly the three-photon excitation of O₂⁺. The nature of the radiative interactions contributing to these additional features is described.

© 1988 Optical Society of America

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