OPTICAL LIMITING IN TeO2–ZnO GLASS FROM Z-SCAN TECHNIQUE

Thomas, R.; Vasuja,; Hari, Misha; Nithyaja, B.; Mathew, S.; Rejeena, I.; Thomas, Sheenu; Nampoori, V. P. N.; Radhakrishnan, P.

doi:10.1142/s0218863511006133

Cited by 9 publications

(3 citation statements)

References 6 publications

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“…Notably, the sharp decreasing trend of T min and the extremely low T min (≈20%) at high radiation can be clearly observed. Two‐photon absorption (TPA) model can be used to fit above changes and the normalized transmittance T ( Z ) can be described by Equations and

T (Z) = \sum_{m = 0}^{\infty} \frac{{[- q_{0} (Z)]}^{m}}{{(m + 1)}^{1.5}}

q_{0} = β \frac{I_{0} ([], 1 - normalexp (- α_{0} L))}{([], 1 + {(Z / Z_{0})}^{2}) α_{0}}

where α 0 and β are the linear absorption coefficient and the TPA coefficient, respectively, L is the thickness of the sample, Z 0 = kω 2 is the diffraction length of beam, k = 2π/λ is the wave number, and ω is the beam waist radius. Based on these relations, the β parameter which directly reflects the TPA property can be calculated to be 3.065 cm GW −1 , which is much larger than that of the other classic nonlinear candidates such as 0.565 cm GW −1 for TeO 2 –Bi 2 O 3 –WO 3 system, 1.428 cm GW −1 for Bi 2 O 3 –B 2 O 3 –TiO 2 system, and 1.483 cm GW −1 for TeO 2 –TiO 2 system .…”

Section: Resultsmentioning

confidence: 51%

Pressureless Crystallization of Glass for Transparent Nanoceramics

et al. 2019

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Transparent nanoceramics embedded with highly dense crystalline domains are promising for applications in missile guidance, infrared night vision, and laser and nuclear radiation detection. Unfortunately, current nanoceramics are strictly constrained by the stringent construction procedures such as super‐high pressure and containerless processing. Here, a pressureless crystallization engineering strategy in glass for elaboration of transparent nanoceramics and fibers is proposed and experimentally demonstrated. By intentional creation of a sharp contrast between nucleation and growth rates, the crystal growth rate during glass crystallization can be significantly suppressed. Importantly, this unique phase‐transition habit enables the achievement of transparent nanoceramics and even smooth fibers with extremely tiny crystalline size (≈20 nm) and high crystallinity (≈97%) under atmospheric pressure. This allows the generation of an attractive nonlinear optical response such as dynamic optical filtering and luminescence in the mid‐infrared waveband of 4300–4950 nm. These findings highlight that the strategy to switch the phase‐transition habit of glass into the unconventional crystallization regime may provide new opportunities for the creation of next‐generation nanoceramics and fibers.

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T (Z) = \sum_{m = 0}^{\infty} \frac{{[- q_{0} (Z)]}^{m}}{{(m + 1)}^{1.5}}

q_{0} = β \frac{I_{0} ([], 1 - normalexp (- α_{0} L))}{([], 1 + {(Z / Z_{0})}^{2}) α_{0}}

Section: Resultsmentioning

confidence: 51%

Pressureless Crystallization of Glass for Transparent Nanoceramics

et al. 2019

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“…The authors observed that ESA was at the basis of the observed effect of RSA, resulting in OL. Furthermore, non doped TeO 2 –ZnO glass was also tested . This exhibited an OL threshold of 45 × 10 –3 J cm –2 at input laser power density of 81 × 10 –3 J cm –2 , and 160 × 10 –3 J cm –2 at input laser power density of 162 × 10 –3 J cm –2 .…”

Section: Inorganic Materialsmentioning

confidence: 99%

Nonlinear Optical Materials for the Smart Filtering of Optical Radiation

2016

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The control of luminous radiation has extremely important implications for modern and future technologies as well as in medicine. In this Review, we detail chemical structures and their relevant photophysical features for various groups of materials, including organic dyes such as metalloporphyrins and metallophthalocyanines (and derivatives), other common organic materials, mixed metal complexes and clusters, fullerenes, dendrimeric nanocomposites, polymeric materials (organic and/or inorganic), inorganic semiconductors, and other nanoscopic materials, utilized or potentially useful for the realization of devices able to filter in a smart way an external radiation. The concept of smart is referred to the characteristic of those materials that are capable to filter the radiation in a dynamic way without the need of an ancillary system for the activation of the required transmission change. In particular, this Review gives emphasis to the nonlinear optical properties of photoactive materials for the function of optical power limiting. All known mechanisms of optical limiting have been analyzed and discussed for the different types of materials.

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“…Such conducting amorphous layer can be of interest in many different applications e.g. in non linear optical material as a reverse saturation absorption based optical limiter [30].…”

Section: Experimental Techniquesmentioning

confidence: 99%