Abstract
We report a new method of 2-dimensional imaging of atomic and molecular species in flames which uses the nonlinear optical process of resonant Degenerate Four-Wave Mixing (DFWM). The technique is demonstrated in a Na-seeded flame where the phase conjugate nature of the DFWM signal is exploited to provide background-free images in a single laser shot with a spatial resolution of MOO pan.Images obtained by DFWM using different rotational lines in the A2 ∑ – X2 ∏ (0,0) band of OH in a pre-mixed methane/air flame were used to construct a two-dimensional map of the temperature in the flame. We report also the demonstration of broadband DFWM in a Na-seeded flame.
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