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Experimental measurements of multiphoton enhanced air breakdown by a subthreshold intensity excimer laser
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View: Figures


Image of FIG. 1.
FIG. 1.

Illustration of REMPI. Absorption of photons raises the molecule to an excited state followed by the absorption of photon for ionization.

Image of FIG. 2.
FIG. 2.

Schematic representation of the 193 nm laser induced plasma experimental system including a two-wavelength interferometer, spectrometer, and shadowgraphy optical diagnostic equipment. BS––beamsplitter, M––mirror, and W––window.

Image of FIG. 3.
FIG. 3.

Sample interferogram with plasma in the measurement arm (left) and the resultant phase distribution in radians calculated using IDEA fringe analysis software (right).

Image of FIG. 4.
FIG. 4.

Shadowgrams of the subthreshold intensity, 193 nm, laser induced plasma and associated shockwave.

Image of FIG. 5.
FIG. 5.

193 nm laser induced plasma image captured with 75 mm focal length lens.

Image of FIG. 6.
FIG. 6.

Plasma line averaged electron density in dry air at 760 Torr with a laser pulse energy of 260 mJ corresponding to a focused irradiance of .

Image of FIG. 7.
FIG. 7.

Log-log plot of the peak intensity of the first negative bandhead at 391.4 nm as function of laser energy in dry air at 20 Torr. Slope indicates REMPI of .

Image of FIG. 8.
FIG. 8.

Pressure scaling of the first negative bandhead at 391.4 nm from 20 to 800 Torr in dry air with 260 mJ laser pulses.

Image of FIG. 9.
FIG. 9.

Broadband emission spectra in dry air at 760 Torr identified as the first negative band system. The dominant peaks belong to the , , and vibrational bandheads.

Image of FIG. 10.
FIG. 10.

Comparison of the measured high resolution emission spectrum from the first negative system with SPECAIR generated plot for dry air at 760 Torr.

Image of FIG. 11.
FIG. 11.

Velocity of the laser induced plasma shockwave in air with STP just ahead of the front.


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Scitation: Experimental measurements of multiphoton enhanced air breakdown by a subthreshold intensity excimer laser