Laser interaction with low-density carbon foam

Pramana

L J Dhareshwar²  A K Rossall³  G Mishra²  N K Gupta²  C G Murali²  D K Kohli¹  G J Tallents³  D S Munda²  R K Khardekar¹  S Tripathi²  Rashmi Singh¹  S Chaurasia1² 

[1] Target Lab, Raja Ramanna Centre for Advanced Technology, Indore 452 013, India$$;Laser & Neutron Physics Section, Bhabha Atomic Research Centre, Mumbai 400 085, India$$;Department of Physics, University of York, York, Y0105 DD, UK$$

关键词: Low-density foam;    X-ray emission;    volume absorption.;   

DOI  :  

学科分类：物理（综合）

来源: Indian Academy of Sciences

【 摘 要 】

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.

【 授权许可】

Unknown