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Sensitive measurement of nonlinear absorption and optical limiting in undoped and Fe-doped ZnO quantum dots using pulsed laser

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Abstract

Zinc oxide quantum dots (QDs) with Fe-doping at different concentrations were prepared by chemical co-precipitation method. The prepared QDs were characterized by UV–Vis spectroscopy, X-ray diffraction and Z-scan technique. The sizes of QDs were found to be within 4.6–6.6 nm range. The nonlinear parameters viz. two-photon absorption coefficient (βTPA) and two-photon absorption cross-section (σTPA) were extracted with the help of open aperture Z-scan technique using nanosecond Nd:YAG laser operating at wavelength 532 nm. Higher values of βTPA and σTPA for Fe doped ZnO implied that they were potential materials for development of photonics devices and sensor protection applications. Fe doped sample (3 % by wt) was found to be the best optical limiter with limiting threshold intensity of 0.64 TW/cm2.

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Acknowledgments

Authors are thankful to University Grant Commission (UGC), India for giving minor research project and providing financial assistance.

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Authors and Affiliations

  1. Department of Physics, Deenbandhu Chhotu Ram University of Science and Technology (D.C.R.U.S.T), Murthal, Sonipat, India

    D. Sharma & B. P. Malik

  2. Department of Physics, Hindu P.G. College, Sonipat, India

    A. Gaur

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  1. D. Sharma
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  2. B. P. Malik
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  3. A. Gaur
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Correspondence to D. Sharma.

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Sharma, D., Malik, B.P. & Gaur, A. Sensitive measurement of nonlinear absorption and optical limiting in undoped and Fe-doped ZnO quantum dots using pulsed laser. Indian J Phys 90, 1293–1298 (2016). https://doi.org/10.1007/s12648-016-0837-6

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