Abstract
Measurements of the temperature field resulting from the interaction of laser-initiated, microwave driven plasma filaments in both air and nitrogen are presented. The evolution of the temperature field for single shot energy deposition by subcritical microwaves result in an energy deposition estimate of about 10 mJ—approximately twenty percent of the available energy of the microwave pulse. Temperatures of 1000 K are observed over a well-defined, and well-localized region corresponding to the designation by focusing of femtosecond laser pulses for the initiation of microwave energy deposition. Additionally, controlled energy deposition in multiple filaments is demonstrated. Remote energy addition through a combination of an ionizing seed laser pulse and subcritical microwave pulse offers the potential for remote ignition and external flow field modification.
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