Z-scan measurements of the multiphoton absorption coefficient and nonlinear refractive index of ZnTe and GaP in the near-IR

2020 ◽  
Author(s):  
E. A. Burova ◽  
S. B. Bodrov ◽  
B. V. Shiskin ◽  
A. I. Korytin ◽  
I. E. Ilyakov ◽  
...  
Keyword(s):  
Refractive Index ◽  
Absorption Coefficient ◽  
Nonlinear Refractive Index ◽  
Multiphoton Absorption ◽  
Near Ir

NON-LINEAR REFRACTIVE INDEX MEASUREMENT OF (2E)-3-[4-(DIMETHYLAMINO)PHENYL]-1-(2,5-DIMETHYLTHIOPHEN-3-YL)PROP-2-EN-1-ONE AND (2E)-3-(3,4-DIMETHOXYPHENYL)-1-(2,5-DIMETHYLTHIOPHEN-3-YL)PROP-2-EN-1-ONE

2011 ◽  
Vol 20 (02) ◽  
pp. 183-191 ◽  
Author(s):  
FRYAD Z. HENARI ◽  
ABDULLAH M. ASIRI
Keyword(s):  
Refractive Index ◽  
Absorption Coefficient ◽  
Nonlinear Absorption ◽  
Nonlinear Refractive Index ◽  
Continuous Wave ◽  
Nonlinear Effects ◽  
Optical Limiting ◽  
Nonlinear Absorption Coefficient ◽  
Refractive Index Measurement ◽  
Index Measurement

We report results from investigations of the nonlinear refractive index and nonlinear absorption coefficient of (2E)-3-[4-(Dimethylamino)phenyl]-1-(2,5-dimethylthiophen-3-yl)prop-2-en-1-one and (2E)-3-(3,4-Dimethoxyphenyl)-1-(2,5-dimethylthiophen-3-yl) prop-2-en-1-one using Z-scan technique with a continuous wave (cw) laser at wavelengths 488 nm and 514 nm. The nonlinear refractive index and nonlinear absorption coefficient of both samples were evaluated. The origin of the nonlinear effects was discussed. Optical limiting based on light induced nonlinear refractive index variation is demonstrated. The limiting thresholds were estimated for both samples. The results suggested that these materials offer promise as candidates for optical limiting and optical devices in the low power regime.

scholarly journals MEASUREMENT OF NONLINEAR RESPONSES AND OPTICAL LIMITING BEHAVIOR OF TIO2/PS NANO-COMPOSITE BY SINGLE BEAM TECHNIQUE WITH DIFFERENT INCIDENT INTENSITIES

2012 ◽  
Vol 05 ◽  
pp. 277-283 ◽  
Author(s):  
M. H. MAJLES ARA ◽  
Z. DEHGHANI
Keyword(s):  
Refractive Index ◽  
Absorption Coefficient ◽  
Nonlinear Absorption ◽  
Nonlinear Refractive Index ◽  
Optical Limiting ◽  
Nonlinear Absorption Coefficient ◽  
Third Order ◽  
Nano Composite ◽  
Single Beam ◽  
The Third

Titanium dioxide (titania) is a cheap, nontoxic and highly efficient photocatalyst being extensively applied for the degradation of organic pollutants, air purification, water splitting, reduction of nitrogen to ammonia, and optical devices due to its optical behaviors. The third-order nonlinear optical properties of TiO 2/ PS nano-composite were studied by means of single beam transmission technique, using a continuous-wave (CW) He - Ne laser beam with a wavelength of 632.8 nm with three different incident intensities. The magnitude and sign of the third-order nonlinear refractive index ( n 2) and nonlinear absorption (β) of TiO 2/ PS nano-composite were determined by use of both the closed-aperture and opened-aperture z -scan techniques. Z -scan technique, developed by Sheik-Bahae et al., has been used widely in material characterization. A single-beam (also called z -scan method) for measuring the sign and magnitude of nonlinear refraction that has simplicity and very high sensitivity has been reported recently. Optical limiting property of TiO 2/ PS nano-composite is studied. The positive sign obtained for nonlinear refractive index indicated that there is a self-focusing effect in the sample. The nonlinear refractive index was in order of 10-8 (cm2/W) and the nonlinear absorption coefficient was obtained in order of 10-2 (cm/W) with negative sign. The values of nonlinear refractive index and nonlinear absorption coefficient are enhanced by decreasing the intensity.

Nonlinear refractive index and three-photon absorption coefficient of poly(9,9-dioctylfluorence)

2009 ◽  
Vol 95 (22) ◽  
pp. 221906 ◽  
Author(s):  
J. I. Jang ◽  
S. Mani ◽  
J. B. Ketterson ◽  
P. Lovera ◽  
G. Redmond
Keyword(s):  
Refractive Index ◽  
Absorption Coefficient ◽  
Nonlinear Refractive Index ◽  
Photon Absorption

Investigation on Z-Scan and its Application of Nonlinear Measurement

2015 ◽  
Vol 713-715 ◽  
pp. 343-346
Author(s):  
Zhi Shu Feng ◽  
Xiao Ming Li ◽  
Xian Yong Jing ◽  
Zhi Huan Lan ◽  
Cheng Da Ning
Keyword(s):  
Refractive Index ◽  
Absorption Coefficient ◽  
Nonlinear Refractive Index ◽  
Coefficient Measurement

The principle of Z-scan and its application on nonlinear refractive index and absorption coefficient measurement are introduced. Besides, two methods of improving sensitivity of Z-scan are described.

scholarly journals NONLINEAR OPTICAL PROPERTIES AND OPTICAL POWER LIMITING OF THE PREPARED POLYMER BLEND POLY (3HT- Co - Th) - PM FILMS

2021 ◽  
Vol 5 (1) ◽  
pp. 1-10
Author(s):  
Imad Al-Deen Hussein Ali Al-Saidi ◽  
Hussein Falih Hussein ◽  
Numan Sleem Hashim
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Absorption Coefficient ◽  
Polymer Blend ◽  
Nonlinear Absorption ◽  
Nonlinear Refractive Index ◽  
Nonlinear Optical ◽  
Optical Power ◽  
Copolymer Poly ◽  
Optical Power Limiting

Poly (3 - Hexylthiophene - Co - Thiophene) copolymer was prepared by using the addition polymerization method. The Nonlinear optical properties and the behavior of the optical power limiting of the prepared polymer blend poly (3HT- Co - Th) - PMMA films were studied by using the z - scan technique for different weight ratios of the copolymer poly (3HT- Co - Th). In the present work, a continuous wave (CW) diode - pumped solid - state laser (DPSSL) of wavelengths 532 nm was used for the irradiation of the prepared film samples. The nonlinear optical parameters such as, the nonlinear refractive index (n2), the nonlinear absorption coefficient (β), and the      third - order - nonlinear optical susceptibility (χ (3)) of the polymer blend poly (3HT- Co - Th) - PMMA films were determined for different weight ratios of the copolymer poly (3HT- Co - Th). It is observed that the polymer blend poly (3HT - Co - Th) - PMMA films exhibit saturable absorption (SA) and self - defocusing effects, and this gives an indication that both, the nonlinear refractive index (n2) and the nonlinear absorption coefficient (β), have negative values. The obtained results indicate that the prepared polymer blend poly (3HT - Co - Th) - PMMA films are promising materials and can be considered as suitable materials for different optical and electronic applications.

scholarly journals Модифицированный метод z-сканирования для определения нелинейности третьего порядка для квантовых точек в режиме резонансного возбуждения

2019 ◽  
Vol 126 (2) ◽  
pp. 208
Author(s):  
Е.А. Пономарева ◽  
И.Д. Скурлов ◽  
С.Э. Путилин ◽  
А.Н. Цыпкин ◽  
А.П. Литвин
Keyword(s):  
Quantum Dots ◽  
Refractive Index ◽  
Lead Sulfide ◽  
Nonlinear Refractive Index ◽  
Thermal Effects ◽  
Colloidal Quantum Dots ◽  
Strong Light ◽  
Excitation Mode ◽  
Near Ir ◽  
Lead Sulfide Quantum Dots

AbstractA modified Z-scan method for determining the nonlinear refractive index of colloidal quantum dots in the near-IR spectral range in the resonant excitation mode is proposed. It is demonstrated that the thermal effects related to heating of the solution due to strong light absorption can be mitigated by reducing the probing pulse repetition rate. The nonlinear refractive index of colloidal lead sulfide quantum dots is found to be on the order of 10^–16 cm^2/W.

scholarly journals Diffraction Rings Pattern and Nonlinear Optical Properties of Hybrid ZnO-NPs / Epoxy Resin

2020 ◽  
Vol 38 (3A) ◽  
pp. 440-445
Author(s):  
Zahraa M. AL-Asady ◽  
Ali H. AL-Hamdani
Keyword(s):  
Refractive Index ◽  
Absorption Coefficient ◽  
Epoxy Resin ◽  
Nonlinear Absorption ◽  
Nonlinear Refractive Index ◽  
Second Harmonic ◽  
Nonlinear Absorption Coefficient ◽  
Zno Nps ◽  
Nano Composite ◽  
Single Beam

In this research, the diffraction ring patterns scan and single-beam Z-scan techniques were used to measure the nonlinear refractive index (n2) and nonlinear absorption coefficient (β). Nano-composite sample, which consists of zinc oxide nanoparticles (ZnO-NPs), and epoxy resin polymer. The sample was prepared by the casting method. A second harmonic generation Nd: YAG laser, which operates at 532 nm and intensity 3183 W/cm2 was used for the two techniques. Z-scan results showed that values for nonlinear refractive index n2 and nonlinear absorption coefficient β were obtained of 6.59*10-9 cm2/W and 1.75*10-3 cm/W respectively. While results for the D-scan technique showed that the number of rings increases with the increasing of laser power.

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