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1. D. Levko and L. L. Raja, Phys. Plasmas 22, 123518 (2015).
2. A. Bataller, J. Koulakis, S. Pree, and S. Putterman, Appl. Phys. Lett. 105, 223501 (2014).
3.See supplementary material in A. Bataller, J. Koulakis, S. Pree, and S. Putterman, “ Nanosecond high-power dense microplasma switch for visible light,” Appl. Phys. Lett. 105, 223501 (2014).

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In an effort to understand the opaque nature of high-voltage nanosecond microdischarges and their ability to block 532 nm nanosecond laser pulses, as demonstrated by Bataller [Appl. Phys. Lett. , 223501 (2014)], Levko and Raja have published a paper [Phys. Plasmas, 123518 (2015)] which simulates sparkdischarges in 1 bar of xenon gas. At this ambient pressure, Levko and Raja simulate final electron densities much too low to explain the observed opacity and conclude the probing laser generates the requisite ionization for self-blocking. However, the experimental findings of Bataller showed opacity being reached at 10 bar, an order of magnitude larger than the pressure simulated by Levko and Raja. Furthermore, Bataller showed the spark remained opaque for very low laser intensities, insufficient to cause any significant ionization. Although the simulation performed by Levko and Raja could have merit at 1 bar, it is not an appropriate comparison to the regime studied by Bataller .


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