Thermal lensing and two photon absorption with saturable absorption based optical limiting behaviour in Co: ZnO nanoparticles under CW and pulsed Nd: YAG laser irradiation.

Ponnusamy P

Department of Thermal and Energy Engineering

School of Mechanical Engineering

Vellore Campus

Sivasubramanian A

Electronics

School of Electronics Engineering

Chennai Campus

Sreekanth Dondapati

Mechanical

Vinitha G

Physics

School of Advanced Sciences

Philip R

Bhalerao G.M.

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

RSC Advances

The present report explores third order nonlinear optical behavior of phase pure Yb3+:YAG nanoparticles for the first time by Z-scan technique. The measurement was carried out using diode pumped continuous wave (CW) Nd:YAG laser at 532 nm. The Yb:YAG nanoparticles exhibit characteristic near-infrared (NIR) emission at 1030 nm under 940 nm excitation. The nanoparticles exhibit high nonlinear refractive index (n2 = 8.649 × 10−8 cm2/W) and low nonlinear absorption coefficient (β = 0.109 × 10−4 cm/W) giving an appreciable figure of merit (FOM) of ∼74.50. The excitation power (8.2–10.5 W cm−2) dependent emission spectra were recorded to study exchange energy interaction of Yb3+ ions with YAG host lattice. By utilizing the nonlinear refractive index ‘n2’ from Z-scan measurement, thermo-optic coefficient (dn/dt) was calculated to demonstrate Yb3+:YAG nanomaterial for high power compact solid state laser gain amplifier systems. © 2018 Elsevier Ltd

Optics & Laser Technology

Third order nonlinearity and optical limiting behaviors of Yb:YAG nanoparticles by Z-scan technique

Need for optical limiting devices that work on the basis of third order optical non-linearity has necessitated the search for different types of materials. Ferrites which show excellent magnetic properties are found to show optical non-linearity and have been exploited for this optical non-linearity in recent times. Current work explores the non-linear optical properties of nickel substituted manganese ferrites synthesized by wet chemical co-precipitation method. Structural studies on these samples indicated the formation of pure spinel ferrites with reduction in their crystallite sizes with increasing nickel concentration. The variation in particle size is similar to the measured optical band gap which is corroborated with the quantum size effect. Information on the presence and effects of defects in these samples are obtained from photoluminescence measurements. Z-scan measurements yielded non-linear optical parameters with their third order nonlinear susceptibility of the order of 10−6 esu. The observed self-defocusing effect was utilized to describe the optical limiting property with optical limiting threshold to be less than 2.5 mW for nickel substituted manganese ferrite nanoparticles under 532 nm CW laser. © 2018 Elsevier Ltd and Techna Group S.r.l.

Ceramics International

Structural and nonlinear optical properties of nickel substituted manganese ferrite nanoparticles

Nonlinear optical interactions of Co: ZnO nanoparticles in continuous and pulsed mode of operations

Journal	Data powered by TypesetRSC Advances
Publisher	Data powered by TypesetRoyal Society of Chemistry (RSC)
ISSN	20462069
Open Access	0