Phys. Rev. Lett. 77, 75–78 (1996)Experimental Confirmation of Ponderomotive-Force Electrons Produced by an Ultrarelativistic Laser Pulse on a Solid TargetReceived 25 March 1996; published in the issue dated 1 July 1996 First measurements of relativistic electrons produced by the interaction between a 400-fs, 1.06- μm ultrahigh-intensity laser pulse (I>1019W/cm2) and a solid target are presented. For electrons ejected along the laser propagation axis in the forward direction, the relation of the hot temperature Th versus the laser intensity I is found to be in very good agreement with a J×B ponderomotive model described by S. C. Wilks et al. [Phys. Rev. Lett. 69, 1383 (1992)], where Th = (γosc-1)mc2. Hot temperature of transverse electrons scales as Th∼I1/3. © 1996 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.77.75
DOI:
10.1103/PhysRevLett.77.75
PACS:
52.40.Nk
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