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Memory effects in the long-wave infrared avalanche ionization of gases: a review of recent progress
Reports on Progress in Physics ( IF 16.620 ) Pub Date : 2019-05-20 , DOI: 10.1088/1361-6633/ab1a07
E M Wright, S W Koch, M Kolesik and J V Moloney

There are currently intense efforts being directed towards extending the range and energy of long distance nonlinear pulse propagation in the atmosphere by moving to longer infrared wavelengths, with the purpose of mitigating the effects of turbulence. In addition, picosecond and longer pulse durations are being used to increase the pulse energy. While both of these tacks promise improvements in applications, such as remote sensing and directed energy, they open up fundamental issues regarding the standard model used to calculate the nonlinear optical properties of dilute gases. Amongst these issues is that for longer wavelengths and longer pulse durations, exponential growth of the laser-generated electron density, the so-called avalanche ionization, can limit the propagation range via nonlinear absorption and plasma defocusing. It is therefore important for the continued development of the field to assess the theory and role of avalanche ionization in gases for longer waveleng...
更新日期:2019-09-10

 

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