Ajay Kumar
Raman Research Institute
5 Papers
Ajay Kumar is an academic researcher from Raman Research Institute. The author has contributed to research in topics: Free carrier absorption & Absorption (electromagnetic radiation). The author has an hindex of 5, co-authored 5 publications.
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Papers
Effect of the band gap and the defect states present within band gap on the non-linear optical absorption behaviour of yttrium aluminium iron garnets
Ajay Kumar,Rajeev Kumar,Nancy Verma,A.V. Anupama,Harish Kumar Choudhary,Reji Philip,Balaram Sahoo +6 more
TL;DR: In this paper, the effect of variation of band gap and electronic defect energy levels within the band gap on nonlinear optical absorption of 532nm (green) laser light by coral-like yttrium aluminium-iron garnet (YAIG, Y3Al5-xFexO12) ceramics prepared by solution combustion route is investigated using Z-scan technique.
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Modulating non-linear optical absorption through controlled graphitization of carbon nanostructures containing Fe3C-graphite core-shell nanoparticles
TL;DR: In this paper, the effect of graphitization and defect concentration on the laser intensity dependent nonlinear absorption (NLA) behavior of carbonaceous nanostructures has been explored, and the authors emphasize that the reported carbonaceous materials with optimum amount of defects in the graphitized framework are attractive for optical limiting in laser safety applications.
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Mechanistic insights into the optical limiting performance of carbonaceous nanomaterials embedded with core─shell type graphite encapsulated Co nanoparticles
TL;DR: The present samples show superior NLA performance even at the much lower laser pulse energy of ∼15 μJ, which is much better than many of the present-day NLA materials too.
46
FeCoCr alloy-nanoparticle embedded bamboo-type carbon nanotubes for non-linear optical limiting application
TL;DR: In this article, pyrolytic synthesis of nitrogen-doped multiwalled carbon nanotubes (NCNTs) incorporated with graphite-encapsulated FeCoCr alloy nanoparticles (FeCoCr@CN sample) was demonstrated.
43
Ni Nanoparticles Coated with Nitrogen-Doped Carbon for Optical Limiting Applications
Rajeev Kumar,Ajay Kumar,Nancy Verma,Vijay Khopkar,Reji Philip,Balaram Sahoo +5 more
- 27 Aug 2020
TL;DR: In this paper, the importance of the free carrier absorption (FCA) process in the nonlinear optical absorption (NLA) behavior of carbonaceous nanomaterials synthesized by pyrolysis at pyrolyses is demonstrated.