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Article type: Research Article
Authors: Chakera, J.A. | Kumbhare, S.R. | Gupta, P.D.
Affiliations: Laser Programme, Centre for Advanced Technology, Indore-452013, India.
Note: [] Corresponding author: J.A. Chakera, Laser programme, Centre for Advanced Technology (CAT), P.O. CAT, Indore-452013, India. Tel.: +91 731 488469.
Abstract: An experimental study is performed of soft X-ray emission from laser produced plasmas for single shot X-ray contact microscopic imaging of physical and biological microstructures. Planar copper targets are irradiated by 10J, 28 nS Nd:glass laser pulses in the intensity range of 1011 W/cm² to 3× 1012W/cm². Measurements of keV X-ray emission viz. X-ray intensity scaling with laser intensity, X-ray source size, X-ray conversion efficiency and exposure dose on the sample are presented. Fine copper grids of 70 mm mesh size and 10 mm thickness are used as test samples for imaging on ERP-40 photoresist. A spatial resolution of ~195 nm is observed, consistent with theoretical estimate considering the contribution of geometrical and diffraction blurring, and statistical noise of photons incident on the sample. This study should be useful in proper selection of source parameters for optimization of spatial resolution in single shot keV contact imaging.
Journal: Journal of X-Ray Science and Technology, vol. 8, no. 2, pp. 135-143, 1998
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