Role of surface roughness in hard x-ray emission from femtosecond laser produced copper plasmas

الأصل · EN

The hard x-ray emission in the energy range of 30-300 keV from copper plasmas produced by 100 fs, 806 nm laser pulses at intensities in the range of 10¹⁵-10¹⁶ W cm⁻² is investigated. We demonstrate that surface roughness of the targets overrides the role of polarization state in the coupling of light to the plasma. We further show that surface roughness has a significant role in enhancing the x-ray emission in the above mentioned energy range.