Self-defocusing/focusing of a relativistic laser pulse in a
multiple-ionizing gas |
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Authors: | Email author" target="_blank">Naveen?KumarEmail author V K?Tripathi B K?Sawhney |
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Institution: | (1) Department of Physics, Indian Institute of Technology, 110016 New Delhi, India |
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Abstract: | A fast rising flattop high power laser pulse, with Gaussian intensity
distribution along its wavefront, causes single and double ionizations of
the gas through which it propagates. The foot of the pulse causes single
ionization of the gas and creates a sharp radial density profile resulting
in strong defocusing of the front part of the pulse. After a little while,
single state ionization saturates, creating a flat density profile in the
axial region and weakening the divergence of the pulse. As the intensity of
the pulse rises further, second state ionization occurs, causing strong
defocusing of the beam. Later in time when the second state ionization
saturates, the relativistic mass nonlinearity together with the electron
cavitation tends to focus the pulse. |
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Keywords: | |
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