Third-order optical limiting action of 2-amino-5-nitro pyridinium chloride (2A5NPCl) crystals was demonstrated for protection of photosensitive components from damages induced by widely used green CW lasers. Crystals grown by slow evaporation possess lattice parameters of a = 9.968Å, b = 7.731Å, c = 4.802Å and β = 95.864˚. 2A5NPCl crystals are highly transparent with wide optical window of 400-1100nm. 2A5NPCl crystals exhibit strong saturable absorption and self-defocusing refraction. Third-order NLO coefficients of 2A5NPCl crystal was estimated to be n2 = -3.20x10−8cm2/W, β = -1.20x10−4cm/W and χ(3) = 5.18x10−6esu. 2A5NPCl crystal exhibits OL action with onset limiting threshold of 14 mW. © 2018, © 2018 Taylor & Francis Group, LLC.

Vinitha G

Physics

School of Advanced Sciences

Chennai Campus

Manikandan S

Sundari A

Sabari Girisun T.C

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

Optical limiting action of 2-amino 5-nitro pyridinium chloride crystal for laser safety devices

Molecular Crystals and Liquid Crystals

Third-order nonlinear optical response of heat-treated magnesium ferrite (MgFe2O4) synthesized by simple combustion was studied by Z-scan experiment under continuous wave laser excitation (532 nm, 50 mW). Powder XRD patterns confirm the single-phase formation of spinel structure MgFe2O4 with cubic symmetry. Estimation of crystallite size from XRD data shows a decrease in size as annealing temperature increases. In the FTIR spectra, two absorption bands around 400 and 600 cm−1 correspond to the octahedral and tetrahedral sites of Fe–O and Mg–O, respectively. FESEM analysis pictures the presence of micro-grained particle with porous structure. Single-beam Z-scan experiment shows that the samples possess saturable absorption and self-defocusing nature. The third-order nonlinear optical properties calculated from the experimental data were consistent with the values predicted by theoretical fit. Estimated third-order nonlinear optical susceptibility, χ(3), was found to be increasing with increase in annealing temperature. The samples exhibit limiting behavior beyond 14.5 mW, and the corresponding output value gets clamped at 1.79, 1.95, and 2.54 mW. Magnesium ferrite treated at 900 °C with higher nonlinear optical susceptibility can be used as a potential candidate for low power limiting applications. © 2015, Springer Science+Business Media New York.

Journal of Materials Science

Third-order nonlinear optical properties and power limiting behavior of magnesium ferrite under CW laser (532 nm, 50 mW) excitation

A new organic stilbazolium derivative crystal 2-[2-(3-hydroxy-4-methoxy-phenyl)-vinyl]-1-methyl-pyridinium naphthalene-2-sulfonate dehydrate (C25H23NO5S·2H2O) (VSNS) was synthesized successfully.

RSC Adv.

Investigation of synthesis, crystal structure and third-order NLO properties of a new stilbazolium derivative crystal: a promising material for nonlinear optical devices

Journal of Alloys and Compounds

Structural, spectral, thermal, micro hardness, dielectric and etching studies of third order nonlinear optical material Cesium Sulfamate

Journal of Molecular Structure

Crystal growth and DFT insight on sodium para- nitrophenolate para- nitrophenol dihydrate single crystal for NLO applications

RSC Advances

Growth and characterization of semi-organic third order nonlinear optical (NLO) potassium 3,5-dinitrobenzoate (KDNB) single crystals

Journal	Molecular Crystals and Liquid Crystals
Publisher	Informa UK Limited
ISSN	1542-1406
Open Access	No