High current density produced by femtosecond nonlinear single-photon photoelectric emission from gold
- 25 January 1993
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 62 (4) , 426-428
- https://doi.org/10.1063/1.108923
Abstract
The sensitivity of single‐photon photoelectric emission of pure‐polycrystalline Au induced by a KrF excimer laser emitting at 248 nm pulses of 450 fs duration, has been measured. A nonlinear increase of photoelectric efficiency as a function of the laser peak intensity has been observed. The threshold of this nonlinearity is estimated from the experimental data to be slightly less than 0.1 GW/cm2. This value is in good agreement with earlier observations for W and Zr. We demonstrate that this is the direct consequence of nonequilibrium electron and lattice temperatures produced at the surface by the subpicosecond laser pulses.Keywords
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