Generation of coherent tunable deep UV radiation for detection and absorption studies of explosives RDX and TNT |
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Authors: | A K Chaudhary A M Rudra P Kumbhakar G C Bhar |
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Institution: | (1) Advanced Centre of Research in High Energy, University of Hyderabad, Hyderabad, 500046, India;(2) Department of Physics, National Institute of Technology, Durgapur, India;(3) Ramkrisna Mission Vivekananda Educational and Research Institute, Belurmath, India |
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Abstract: | We report a technique for the efficient generation of tunable coherent deep UV radiation and its application in studies of
RDX and TNT at the ppm level on the basis of their absorption characteristics. The obtained experimental absorption data are
compared with conventional spectrophotometric data. The UV radiation in the range 200–260 nm has been generated by the type-I
noncollinear third harmonic of the dye laser radiation (600–700 nm) and also by sum frequency mixing (SFM) of Nd:YAG output
(1064 nm) with the second harmonic of the dye laser in β-barium borate (BBO) crystal. The maximum conversion efficiency of
the generated signal is estimated to be 57.5% at λ = 218.9 nm wavelength. Apart from measurements of the absorbance of RDX
and TNT at different concentrations in their respective solutions, the minimum detection concentrations have also been ascertained.
The estimated minimum detectable concentration of RDX is 8.47·10−9 M, whereas that for TNT is 35.7·10−9 M. The data were obtained using only ∼100 μJ/pulse of laser energy.
Published in Zhurnal Prikladnoi Spektroskopii, Vol. 74, No. 6, pp. 516–521, July–August, 2007. |
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Keywords: | RDX and TNT explosives absorption characteristics Nd:YAG laser tunable dye laser phase matching sum frequency mixing BBO crystal |
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