Effect of annealing on nonlinear optical properties of 70% deuterated DKDP crystals at 355 nm

AbstractCompounds WCu2OS3(PPh3)4 (I) and MoCu2OS3(PPh3)3 (II) were synthesized by reactions of (NH4)2MO2S2 (M = W, Mo), Cu2S and PPh3 in solid state for nonlinear optical studies. A wide transparent window (λ = 400 - 1000 nm) was observed for both clusters, which makes them attractive for nonlinear optical (NLO) applications. NLO properties of the clusters were studied with a 7-ns pulsed laser at 532 nm. Cluster I exhibits mainly optical self-focusing (n2 = 8 × 10-18 m2 W-1, as measured with an 1.2 × 10-4 M acetonitrile solution) with negligibly small nonlinear absorption. Cluster II exhibits both optical self-focusing (n2 = 5 × 10-17 m2 W-1, as measured with a 7.4 × 10-5 M acetonitrile solution) and nonlinear absorption (α2 = 2.6 × 10-10 m W-1). The third-order NLO susceptibilities (χ(3)) of the two clusters at the above-mentioned concentrations are 2 × 10-11 esu for I and 1.2 × 10-10 esu for II respectively. These nonlinear optical properties of the clusters were compared with those of cubic cage shaped and nest shaped clusters to reveal a qualitative structure/NLO property correlation.

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Size-Dependent Nonlinear Optical Properties of Gd2O2S:Tb3+ Scintillators and Their Doped Gel Glasses

Molecules ◽

10.3390/molecules27010085 ◽

2021 ◽

Vol 27 (1) ◽

pp. 85

Author(s):

Long Chen ◽

Cuiyu Wu ◽

Zheng Xie ◽

Chenghua Sun ◽

Shuyun Zhou

Keyword(s):

Optical Properties ◽

Nonlinear Optical ◽

Damage Threshold ◽

Optical Limiting ◽

Fast Response ◽

High Energy ◽

Nonlinear Optical Properties ◽

Nanosecond Laser ◽

Size Dependent ◽

Gel Glasses

With the advancement of ultra-fast and high-energy pulsed laser output, lasers have caused serious harm to precision instruments and human eyes. Therefore, the development of optical limiting materials with a fast response, low optical limiting threshold, and high damage threshold are important. In this work, for the first time, it is reported that phosphors Gd2O2S:Tb3+(GOS) displays exceptional functionality in laser protection. GOS with sizes of 11 μm, 1 μm, and 0.45 μm are prepared. Based on the optical limiting and Z-scan technology systems under 532 nm and 1064 nm nanosecond laser excitation, the nonlinear optical properties of GOS are investigated. It is found that GOS exhibits outstanding optical limiting properties. In addition, the optical limiting response of GOS is size-dependent. Concerning the largest particle size, GOS has the best nonlinear optical response, while the precursor shows no nonlinear optical performance. Meanwhile, GOS doped gel glass also displays excellent optical limiting properties with high transmittance, which preliminarily validates the application of GOS and other scintillators in nonlinear optics and encourages more research to better realize the potential of GOS.

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Third-order optical nonlinearity of DSR13/THF solutions under CW He–Ne laser irradiation using Z-scan method

Canadian Journal of Physics ◽

10.1139/cjp-2018-0991 ◽

2021 ◽

pp. 1-7

Author(s):

Bassam Abbas ◽

Mohammad Alshikh Khalil

Keyword(s):

Refractive Index ◽

Optical Properties ◽

Nonlinear Absorption ◽

Nonlinear Refractive Index ◽

Nonlinear Optical ◽

Nonlinear Optical Properties ◽

Photon Absorption ◽

Third Order ◽

The Third ◽

Order Susceptibility

The Z-scan technique was employed to explore the third-order nonlinear optical properties of disperse red 13 organic chromophore solutions in tetrahydrofuran. A continuous-wave He–Ne laser (632.8 nm) was used as a source of irradiation. The nonlinear absorption and nonlinear refractive index coefficients of this dye were investigated. The results showed that this dye has a good nonlinear response with its real and imaginary quantities of third-order susceptibility. The solutions showed negative nonlinear refraction. The best obtained value of the third-order susceptibility was 6.37 × 10–3 esu at a dye concentration of 3.15 × 10–4 mol/L. Moreover, the nonlinear optical properties were enhanced with higher dye concentrations, and an elevated trend in nonlinear absorption and nonlinear refractive index coefficients was observed. Also, it was found that the reverse saturable absorption was the main mechanism responsible for the two-photon absorption effect in DSR13/THF samples.

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Effect of thermal annealing on structural, linear and nonlinear optical properties of 1, 4, 5, 8-naphthalene tetracarboxylic dianhydride thin films

Journal of Molecular Structure ◽

10.1016/j.molstruc.2018.10.058 ◽

2019 ◽

Vol 1178 ◽

pp. 408-419 ◽

Cited By ~ 10

Author(s):

H. Abdel-Khalek ◽

E. Shalaan ◽

Mohamed Abd- El Salam ◽

Aida M. El-Sagheer ◽

Ahmed M. El-Mahalawy

Keyword(s):

Thin Films ◽

Optical Properties ◽

Thermal Annealing ◽

Nonlinear Optical ◽

Nonlinear Optical Properties ◽

Linear And Nonlinear ◽

Tetracarboxylic Dianhydride

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Nonlinear optical properties of a gold-silica composite with high gold fill fraction and the sign change of its nonlinear absorption coefficient

Journal of the Optical Society of America B ◽

10.1364/josab.25.000945 ◽

2008 ◽

Vol 25 (6) ◽

pp. 945 ◽

Cited By ~ 40

Author(s):

Giovanni Piredda ◽

David D. Smith ◽

Bettina Wendling ◽

Robert W. Boyd

Keyword(s):

Optical Properties ◽

Absorption Coefficient ◽

Nonlinear Absorption ◽

Nonlinear Optical ◽

Nonlinear Optical Properties ◽

Nonlinear Absorption Coefficient ◽

Silica Composite ◽

Sign Change ◽

Fill Fraction

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Enhanced luminescence and nonlinear optical properties of nanocomposites of ZnO–Cu

Journal of Materials Research ◽

10.1557/jmr.2008.0364 ◽

2008 ◽

Vol 23 (11) ◽

pp. 2836-2845 ◽

Cited By ~ 11

Author(s):

Litty Irimpan ◽

V.P.N. Nampoori ◽

P. Radhakrishnan

Keyword(s):

Optical Properties ◽

Nonlinear Absorption ◽

Nonlinear Optical ◽

Volume Fraction ◽

Nonlinear Optical Properties ◽

Visible Emission ◽

Photon Absorption ◽

Nonlinear Material ◽

Saturable Absorption ◽

Uv Emission

In this article, we present the spectral and nonlinear optical properties of ZnO–Cu nanocomposites prepared by colloidal chemical synthesis. The emission consisted of two peaks. The 385-nm ultraviolet (UV) peak is attributed to ZnO and the 550-nm visible peak is attributed to Cu nanocolloids. Obvious enhancement of UV and visible emission of the samples is observed and the strongest UV emission of a typical ZnO–Cu nanocomposite is over three times stronger than that of pure ZnO. Cu acts as a sensitizer and the enhancement of UV emission are caused by excitons formed at the interface between Cu and ZnO. As the volume fraction of Cu increases beyond a particular value, the intensity of the UV peak decreases while the intensity of the visible peak increases, and the strongest visible emission of a typical ZnO–Cu nanocomposite is over ten times stronger than that of pure Cu. The emission mechanism is discussed. Nonlinear optical response of these samples is studied using nanosecond laser pulses from a tunable laser in the wavelength range of 450–650 nm, which includes the surface plasmon absorption (SPA) band. The nonlinear response is wavelength dependent and switching from reverse saturable absorption (RSA) to saturable absorption (SA) has been observed for Cu nanocolloids as the excitation wavelength changes from the low absorption window region to higher absorption regime near the SPA band. However, ZnO colloids and ZnO–Cu nanocomposites exhibit induced absorption at this wavelength. Such a changeover in the sign of the nonlinearity of ZnO–Cu nanocomposites, with respect to Cu nanocolloids, is related to the interplay of plasmon band bleach and optical limiting mechanisms. The SA again changes back to RSA when we move over to the infrared region. The ZnO–Cu nanocomposites show self-defocusing nonlinearity and good nonlinear absorption behavior. The nonlinear refractive index and the nonlinear absorption increases with increasing Cu volume fraction at 532 nm. The observed nonlinear absorption is explained through two-photon absorption followed by weak free-carrier absorption and interband absorption mechanisms. This study is important in identifying the spectral range and composition over which the nonlinear material acts as a RSA-based optical limiter. ZnO–Cu is a potential nanocomposite material for the light emission and for the development of nonlinear optical devices with a relatively small limiting threshold.

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