X-Ray Emission from Laser Irradiated Structured Gold Targets
Laser produced plasma is a potential source of X-rays and there has been a substantial work on the generation of such sources1–4 using various laser parameters like wavelength, pulse duration, laser intensity and also target atomic numbers etc.. X-ray enhancement by micro structuring the target surface5–9 and target configurationlike spherical cavity10 and half cylindrical grooves11 have been reported. A continuum X-ray spectra in 1–100 nm range can be easily produced by using a laser beam of wavelength ~1 µm, pulse duration ~10 ns, power density ~1012 W/cm2 on a high “z” target materials3 like gold (z =79). Such spectra is obtained due to various transition to N and O shells ie.on the dynamics of the populations of electron energy levels. The purpose of the experiment reported here was to study the possibility of obtaining higher X-ray yield for a given laser parameter and target material. Present results show that we can obtain almost twice the X-ray flux as compared to planar gold slab target by simply modifying the target surface. ie. the size and cost of the laser system to produce a given X-ray flux can be reduced.
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