Bright Ar quasimonochromatic K-shell x ray with very little background has been generated using an Ar clustering gas jet target irradiated with a 30 fs ultrahigh-contrast laser, with a measured flux of 2.2×1011 photons/J into 4π. This intense x-ray source critically depends on the laser contrast and intensity. The optimization of source output with interaction length is addressed. Simulations point to a nonlinear resonant mechanism of electron heating during the early stage of laser interaction, resulting in enhanced x-ray emission. The x-ray pulse duration is expected to be only 10 fs, opening the possibility for single-shot ultrafast keV x-ray imaging applications.
- femtosecond K-shell X-ray source
- laser-driven ar clusters
Chen, L. M., Liu, F., Wang, W. M., Kando, M., Mao, J. Y., Zhang, L., Ma, J. L., Li, Y. T., Bulanov, S. V., Tajima, T., Kato, Y., Sheng, Z-M., Wei, Z. Y., & Zhang, J. (2010). Intense high-contrast femtosecond K-shell X-ray source from laser-driven ar clusters. Physical Review Letters, 104, . https://doi.org/10.1103/PhysRevLett.104.215004