Intense and Reproducible K$\alpha$ Emissions from Micron-Sized Kr Cluster Target Irradiated with Intense Femtosecond Laser Pulses

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Intense and reproducible Kr K$\alpha$ X-rays (${\sim}12.7$ keV) have been generated via the interaction between a 3 TW laser pulse and a micron-sized Kr cluster target. A single-photon counting technique with an X-ray charge-coupled device (X-ray CCD) was used for measurements of the X-ray energy spectrum in a single shot. At a laser irradiance of $8 \times 10^{16}$ W/cm2, the averages and standard deviations of the total X-ray yield and K$\alpha$ X-ray yield were equal to $(6.6 \pm 1.1) \times 10^{7}$ and $(6.8 \pm 2.6) \times 10^{5}$ photons/sr, respectively. When the X-ray energy spectrum was fit using a Maxwellian with an effective temperature, the temperature was estimated to be $1.62 \pm 0.08$ keV. These results indicate that the X-ray energy spectrum was reproducible at $8 \times 10^{16}$ W/cm2.
2010-12-25