A pump–probe investigation of laser-droplet plasma dynamics

McNaught, S. J.; Fan, J.; Parra, E.; Milchberg, H. M.
December 2001
Applied Physics Letters;12/17/2001, Vol. 79 Issue 25, p4100
Academic Journal
The temporal character of the plasma formed by the irradiation of micron-sized argon and krypton droplets with intense 100-ps laser pulses is investigated using a pump-probe scheme. The evolution of the droplet plasma is assessed by monitoring delay-dependent x-ray and extreme ultraviolet (EUV) emission, and by imaging frequency-doubled probe light scattered from the interaction region. Depending on the spectral region of interest, the type of emission, and the droplet characteristics, the effective plasma lifetime can extend from a few hundred picoseconds to as long as several nanoseconds. Knowledge of the droplet plasma lifetime is important in optimizing the efficiency of this laser plasma as an EUV or x-ray source. © 2001 American Institute of Physics. [DOI: 10.1063/1.1426266].


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