Effect of dopants on the nonlinear optical properties of fluorotellurite glasses for optical limiting application

Abstract

Investigation on non-linear optical property of zinc and barium based fluorotellurite glasses based on open aperture Z-scan technique and its application as an optical limiter is reported. Changes in various parameters like polarizability, refractive index and molar refractivity have been attributed to the presence of barium/ zinc atoms and their impact on modifying the structure. Formation of nonbridging sites owing to fluorine doping have been explored based on Raman measurements. Open aperture data shows reverse saturable absorption behaviour and is attributed to the two-photon absorption process. Non-linear absorption values are found to increase with doping of both barium fluoride and zinc fluoride which has been attributed to the formation of non-bridging fluorine sites alongwith the polarizability of barium atoms. Effect of non-bridging fluorine sites on modifying the optical properties have been justified based on the energy bandgap values. Samples show comparably good optical limiting thresholds with a value of 2.59×10 12 W m −2 for the sample with highest fluorine concentration, which enables them to be used as limiting devices.

Structural characterization of a new fluorophosphotellurite glass system

“…22,23 In addition, incorporating larger amounts of fluoride precursors could also enhance the optical properties of the resulting fluorophosphotellurite glasses, including wider transmission windows ranging from UV (∼300 nm) to the mid-IR range (4-7 μm), higher rare-earth solubility, and lower phonon energies. In this way, enhanced optical performance of fluorotellurite glasses [24][25][26][27][28][29][30][31][32][33][34][35] can be combined in an ideal way with the improved mechanical and chemical stability of the glasses, resulting from the presence of the phosphate network former. However, as relatively few studies have been published on fluorophosphotellurite glasses 22,[36][37][38] this remains a wide-open field of investigation.…”

Computation and experimental results on spectroscopic and physicochemical properties of efficient piperidine driven passive optical limiting material

“…Third-order nonlinear optical (NLO) materials based on πand free electron-rich substances, such as organics [1][2][3][4][5], semi-organics [6][7][8], cocrystals [9][10][11][12][13], rare earth element treated glasses [14][15][16][17], and various nanomaterials [18][19][20][21][22][23], have emerged as viable solutions for passive optical limiting applications. The increased perception of the connection between material's structure and photophysical characteristics has enabled the design of efficient limiting materials leading to devices.…”