Role of the plasma scale length in the harmonic generation from solid targets
M. ZepfBlackett Laboratory, Imperial College of Science, Technology and Medicine, London SW7 2AZ, United KingdomG. D. TsakirisMax-Planck-Institut für Quantenoptik, D-85748 Garching, GermanyG. PretzlerMax-Planck-Institut für Quantenoptik, D-85748 Garching, GermanyI. WattsBlackett Laboratory, Imperial College of Science, Technology and Medicine, London SW7 2AZ, United KingdomD. M. ChambersClarendon Laboratory, Department of Physics, University of Oxford, Parks Road, Oxford OX1 3PU, United KingdomP. A. NorreysCentral Laser Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, United KingdomU. AndielMax-Planck-Institut für Quantenoptik, D-85748 Garching, GermanyA. E. DangorBlackett Laboratory, Imperial College of Science, Technology and Medicine, London SW7 2AZ, United KingdomK. EidmannMax-Planck-Institut für Quantenoptik, D-85748 Garching, GermanyC. GahnMax-Planck-Institut für Quantenoptik, D-85748 Garching, GermanyA. MachacekClarendon Laboratory, Department of Physics, University of Oxford, Parks Road, Oxford OX1 3PU, United KingdomJ. S. WarkClarendon Laboratory, Department of Physics, University of Oxford, Parks Road, Oxford OX1 3PU, United KingdomK. WitteMax-Planck-Institut für Quantenoptik, D-85748 Garching, Germany
1998en
ABI
Annotatsiya
We have investigated the generation of high harmonics from the interaction of 150 fsec, 790 nm, and 395 nm laser pulses with solid targets. Experiments are presented that demonstrate a strong dependence of the conversion efficiency on the temporal pulse shape and the resulting density scale length $(L/\ensuremath{\lambda})$ of the preformed plasma. The highest conversion efficiencies are achieved for short density scale lengths $(L/\ensuremath{\lambda}<~0.4),$ which result from high contrast ratio pulse interactions.
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