Phase modulation of intense ultrashort laser pulses reflected from steep, dense plasmas |
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Authors: | Kingham R J Gibbon P Theobald W Veisz L Sauerbrey R |
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Affiliation: | Insitut für Optik und Quantenelektronik, Friedrich-Schiller Universit?t, Jena, Germany. |
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Abstract: | The phase modulation of intense ( I = 10(18) W/cm(2)) ultrashort laser pulses ( tau(p) = 70 fs) after reflection from steep, dense plasmas has been temporally resolved for the first time in particle-in-cell simulations. The position of the turning point from where the pulse reflects has been compared to the phase modulation, over a range of angles of incidence. At normal incidence or s polarization the phase modulation almost exactly represents the movement of the turning point due to the light pressure. As the angle of incidence is increased for p polarization, the simple Fresnel relationship between phase modulation and displacement of the reflection position, Delta phi(t) = -2k(0)Delta x(t)cos theta(0), increasingly breaks down. |
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