Optical Characteristics of Vitamin D3 Soft Gel

In this work, the linear properties of Vitamin D3-5000IU soft gel were investigated by measuring its absorption and fluorescence spectra. It was observed that there was a shift towards longer wavelength within limits (75 nm), with quantitative efficiency equal to (33.58%). The values of absorbance were used to calculate the extinction coefficient, optical refractive index, optical conductivity and optical dielectric constant values. The non-linear properties of Vitamin D3-5000IU soft gel was also studied using the Z-Scan technique by using Neodymium-doped Yttrium Garnet (Nd: YAG) continuous laser (CW) emitting in (532 nm) wavelength, by utilize open aperture to measure nonlinear absorption coefficient and close aperture (diameter 1.5mm) to measure nonlinear refractive index. The sample behaves as two-photon absorption, and the nonlinear refractive index was positive.

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Dependence of nonlinear refractive index of ZnSe on Be and Mg content

Opto-Electronics Review ◽

10.2478/s11772-010-0053-4 ◽

2010 ◽

Vol 18 (4) ◽

Cited By ~ 3

Author(s):

B. Derkowska ◽

F. Firszt ◽

A. Marasek ◽

B. Sahraoui

Keyword(s):

Refractive Index ◽

Absorption Coefficient ◽

Nonlinear Refractive Index ◽

Photon Absorption ◽

Two Photon Absorption ◽

Two Photon ◽

Transmission Measurements ◽

Two Photon Absorption Coefficient ◽

Mg Content ◽

532 Nm

AbstractThe values of the nonlinear refractive index n2 and the two-photon absorption coefficient β of ternary and quaternary ZnSe-based mixed crystals were extracted from the standard backward degenerate four wave mixing (DFWM) and nonlinear transmission measurements at 532 nm, respectively. Studied crystals were grown by the modified high-pressure Bridgman method. We found that the value of the nonlinear refractive index n2 for Zn0.79Be0.21Se is higher than that for Zn0.80Mg0.20Se. However, the opposite behaviour was found in the case of two-photon absorption coefficient β for these compounds. We also found that the values of the nonlinear refractive index n2 and the two-photon absorption coefficient β for Zn0.83Be0.04Mg0.13Se are about five times lower and three times higher than that for Zn0.80Mg0.13Se, respectively. In the case of ternary ZnSe-based crystals we noticed that the value of the nonlinear refractive index n2 decreases with increasing Mg or Be content. However, the value of the two-photon absorption coefficient β increases with increasing Mg or Be content.

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The Influence of Quantum Confinement on Third-Order Nonlinearities in Porous Silicon Thin Films

Applied Sciences ◽

10.3390/app8101810 ◽

2018 ◽

Vol 8 (10) ◽

pp. 1810 ◽

Cited By ~ 3

Author(s):

Rihan Wu ◽

Jack Collins ◽

Leigh Canham ◽

Andrey Kaplan

Keyword(s):

Refractive Index ◽

Nonlinear Refractive Index ◽

Quantum Confinement ◽

Nonlinear Refraction ◽

Photon Absorption ◽

Third Order ◽

Two Photon Absorption ◽

Two Photon ◽

Silicon Thin Films ◽

Gaussian Decomposition

We present an experimental investigation into the third-order nonlinearity of conventional crystalline (c-Si) and porous (p-Si) silicon with Z-scan technique at 800-nm and 2.4- μ m wavelengths. The Gaussian decomposition method is applied to extract the nonlinear refractive index, n 2 , and the two-photon absorption (TPA) coefficient, β , from the experimental results. The nonlinear refractive index obtained for c-Si is 7 ± 2 × 10 − 6 cm 2 /GW and for p-Si is − 9 ± 3 × 10 − 5 cm 2 /GW. The TPA coefficient was found to be 2.9 ± 0.9 cm/GW and 1.0 ± 0.3 cm/GW for c-Si and p-Si, respectively. We show an enhancement of the nonlinear refraction and a suppression of TPA in p-Si in comparison to c-Si, and the enhancement gets stronger as the wavelength increases.

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Dispersion of nonlinear refractive index in layered WS_2 and WSe_2 semiconductor films induced by two-photon absorption

Optics Letters ◽

10.1364/ol.41.003936 ◽

2016 ◽

Vol 41 (17) ◽

pp. 3936 ◽

Cited By ~ 49

Author(s):

Ningning Dong ◽

Yuanxin Li ◽

Saifeng Zhang ◽

Niall McEvoy ◽

Xiaoyan Zhang ◽

...

Keyword(s):

Refractive Index ◽

Nonlinear Refractive Index ◽

Photon Absorption ◽

Semiconductor Films ◽

Two Photon Absorption ◽

Two Photon

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Determination of Nonlinear Refractive Index and Two-Photon Absorption Coefficients of New Nanocomposite Materials Based on Biosilicates Using Z-Scan Method

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1025-1026.776 ◽

2014 ◽

Vol 1025-1026 ◽

pp. 776-781 ◽

Cited By ~ 1

Author(s):

Dmitriy Proschenko ◽

Alexandr Mayor ◽

Oleg Bukin ◽

Sergey Golik ◽

Irina Postnova ◽

...

Keyword(s):

Refractive Index ◽

Optical Properties ◽

Nonlinear Refractive Index ◽

Nonlinear Optical ◽

Nanocomposite Materials ◽

Photon Absorption ◽

Absorption Coefficients ◽

Two Photon Absorption ◽

Two Photon

Nonlinear refractive indexes and two-photon absorption coefficients of new biosilicate nanocomposite materials based on precursor tetrakis (2-hydroxyethyl) orthosilicate (Si-precursor THEOS) were determined by created portative automation measuring complex based on Z-scan technique. Influence of different additives on nonlinear optical properties such media is considered. Energy thresholds of forming filaments and the efficiency of conversion initial radiation in supercontinuum in the range 400-700 nm are considered.

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