Chaurasia, S., Tripathi, S., Munda, D. S., Mishra, G., Murali, C. G., Gupta, N. K., Dhareshwar, L. J., Rossall, A. K., Tallents, G. J., Singh, Rashmi, Kohli, D. K. and Khardekar, R. K. (2010) Laser interaction with low-density carbon foam. Pramana, 75 (6). pp. 1191-1196. ISSN 0304-4289

Experiments were performed with a 15 J/500 ps Nd:glass laser (λ = 1064 nm) focussed to an intensity >1014 W/cm2. X-ray emissions from carbon foam and 5% Pt-doped carbon foam of density 150–300 mg/cc were compared with that of the solid carbon targets. The thickness of the carbon foam was 15 µm on a graphite substrate. X-ray emission was measured using semiconductor X-ray diodes covered with various filters having transmissions in different X-ray spectral ranges. It covered X-ray spectrum of 0.8–8.5 keV range. The X-ray emission in the soft X-ray region was observed to increase to about 1.8 times and 2.3 times in carbon foam and Pt-doped foam, respectively with respect to solid carbon. In hard X-rays, there was no measurable difference amongst the carbon foam, Pt-doped carbon foam and solid carbon. Scanning electron microscope (SEM) analysis demonstrates that foam targets smoothens the crater formed by the laser irradiation.

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