We present spatially enhanced electric-field-induced second-harmonic (SEEFISH) generation with a chirped femtosecond beam for measurements of electric field in mesoscale confined geometries subject to destructive spurious second-harmonic generation (SHG). Spurious SHG is shown to interfere with the measured E-FISH signal coherently, and thus simple background subtraction is not sufficient for single-beam E-FISH approaches, especially in a confined system with a large surface-to-volume ratio. The results show that a chirped femtosecond beam is effective in preventing higher-order mixing and white light generation in windows near the beam focal point which further contaminates the SEEFISH signal. The successful measurements of electric field of a nanosecond dielectric barrier discharge in a test cell demonstrated that spurious SHG detected with a congruent traditional E-FISH approach can be eliminated using the SEEFISH approach.
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Vorenkamp, Madeline ; Steinmetz, Scott A. ; Chen, Timothy Y. ; Mao, Xingqian ; Starikovskiy, Andrey ; Kliewer, Christopher ; Ju, Yiguang ( , Proceedings of the Combustion Institute)
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Steinmetz, Scott A. ; DeLaRiva, Andrew T. ; Riley, Christopher ; Schrader, Paul ; Datye, Abhaya ; Spoerke, Erik D. ; Kliewer, Christopher J. ( , The Journal of Physical Chemistry C)
