2 February 2009 Degenerate four-wave mixing measurement in iodine vapor
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Abstract
Degenerate four-wave mixing (DFWM) is a nonlinear optical process that has been developed as a detective tool for making quantitative measurements of gas dynamic properties in the various environments. This technique can be used to measure temperature and species concentration in both flames and plasma environments. The resulting coherent signal beam makes DFWM particularly attractive for luminous and harsh environments, compared to incoherent techniques, such as laser-induced fluorescence (LIF). Forward DFWM with self-stability of spilt-beam system has been demonstrated in iodine vapor. It's found that there exists no LIF because of collision quenching at atmospheric pressure and room temperature. But observed vivid DFWM spectroscopy (554-556nm) of iodine vapor at 0oC and room temperature. Furthermore, DFWM can probe non-fluorescing species. We describe a novel advanced sensor method for measuring temperature of gas flows using DFWM. This technique without suffering of severe quenching problems at atmospheric pressure is of importance to trace atom, molecular and radical in combustion diagnosis.
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Wei-Bo Wang, De-Ying Chen, Rong-Wei Fan, Jun Yang, "Degenerate four-wave mixing measurement in iodine vapor", Proc. SPIE 7157, 2008 International Conference on Optical Instruments and Technology: Advanced Sensor Technologies and Applications, 71571M (2 February 2009); doi: 10.1117/12.811982; https://doi.org/10.1117/12.811982
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