Study on nonlinear refractive properties of KDP and DKDP crystals

RSC Advances ◽  
2016 ◽  
Vol 6 (18) ◽  
pp. 14490-14495 ◽  
Author(s):  
Duanliang Wang ◽  
Tingbin Li ◽  
Shenglai Wang ◽  
Jiyang Wang ◽  
Zhengping Wang ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Nonlinear Refractive Index ◽  
Nonlinear Optical ◽  
Anisotropic Media ◽  
Nonlinear Optical Properties

The nonlinear refractive index n2 is an important parameter for the nonlinear optical properties of a medium. Especially for the anisotropic media, the nonlinear refractive index is closely related with the direction.

scholarly journals Fused ring effect on optical nonlinearity and structure property relationship of anthracenyl chalcone based push-pull chromophores

PLoS ONE ◽  
2021 ◽  
Vol 16 (9) ◽  
pp. e0257808
Author(s):  
Dian Alwani Zainuri ◽  
Mundzir Abdullah ◽  
Muhamad Fikri Zaini ◽  
Hazri Bakhtiar ◽  
Suhana Arshad ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Electrostatic Potential ◽  
Nonlinear Refractive Index ◽  
Optical Switching ◽  
Nonlinear Optical ◽  
Continuous Wave ◽  
Excited State Absorption ◽  
Nonlinear Optical Properties ◽  
Closed Aperture

The Ultraviolet-visible (UV-Vis) spectra indicate that anthracenyl chalcones (ACs) have high maximum wavelengths and good transparency windows for optical applications and are suitable for optoelectronic applications owing to their HOMO–LUMO energy gaps (2.93 and 2.76 eV). Different donor substituents on the AC affect their dipole moments and nonlinear optical (NLO) responses. The positive, negative, and neutral electrostatic potential regions of the molecules were identified using molecular electrostatic potential (MEP). The stability of the molecule on account of hyperconjugative interactions and accompanying charge delocalization was analyzed using natural bond orbital (NBO) analysis. Open and closed aperture Z-scans were performed using a continuous-wave frequency-doubled diode-pumped solid-state (DPSS) laser to measure the nonlinear absorption and nonlinear refractive index coefficients, respectively. The valley-to-peak profile of AC indicated a negative nonlinear refractive index coefficient. The obtained single crystals possess reverse saturation absorption due to excited-state absorption. The structural and nonlinear optical properties of the molecules have been discussed, along with the role of anthracene substitution for enhancing the nonlinear optical properties. The calculated third-order susceptibility value was 1.10 x10-4 esu at an intensity of 4.1 kW/cm2, higher than the reported values for related chalcone derivatives. The NLO response for both ACs offers excellent potential in optical switching and limiting applications.

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

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.

Preparation, characterization, and study of the nonlinear optical properties of a new prepared nanoparticles copolymer

2019 ◽  
Vol 33 (36) ◽  
pp. 1950456 ◽  
Author(s):  
Mahmoud Sh. Hussain ◽  
Qusay M. A. Hassan ◽  
H. A. Sultan ◽  
Ahmed S. Al-Asadi ◽  
Hani T. Chayed ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Nonlinear Refractive Index ◽  
Nonlinear Optical ◽  
Local Heating ◽  
Vertical Direction ◽  
Nonlinear Optical Properties ◽  
Convection Current ◽  
Diffraction Ring ◽  
Experimental Findings

The nonlinear optical properties of a nanoparticle polyaniline/polyacrylonitrile (PAn/PANr) copolymer newly prepared via experimental and theoretical findings are reported. Diffraction ring patterns result in the far field when a CW, visible, 473 nm, low power laser beam traverses the solution of PAn/PANr in the solvent ethanol. The diffraction ring patterns are usually used to estimate the nonlinear refractive index while the Z-scan is used to measure both nonlinear refractive index and its sign and nonlinear absorption coefficient. The experimentally observed ring patterns are numerically reproduced via the use of the Fresnel–Kirchhoff procedure. Good agreement between experimental findings and the numerical ones are obtained. The obtained diffraction ring patterns suffer modification in the vertical direction due to convection current as a result of local heating of the sample and the presence of gravity.

scholarly journals Linear and nonlinear optical properties of hybrid metallic–dielectric plasmonic nanoantennas

2016 ◽  
Vol 7 ◽  
pp. 111-120 ◽  
Author(s):  
Mario Hentschel ◽  
Bernd Metzger ◽  
Bastian Knabe ◽  
Karsten Buse ◽  
Harald Giessen
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Nonlinear Optical ◽  
Nonlinear Response ◽  
High Efficiency ◽  
Dielectric Materials ◽  
Nonlinear Optical Properties ◽  
Linear Optical Properties ◽  
Linear And Nonlinear ◽  
Linear Optical

We study the linear and nonlinear optical properties of hybrid metallic–dielectric plasmonic gap nanoantennas. Using a two-step-aligned electron beam lithography process, we demonstrate the ability to selectively and reproducibly fill the gap region of nanoantennas with dielectric nanoparticles made of lithium niobate (LiNbO3) with high efficiency. The linear optical properties of the antennas are modified due to the large refractive index of the material. This leads to a change in the coupling strength as well as an increase of the effective refractive index of the surrounding. The combination of these two effects causes a red- or blue-shift of the plasmonic modes, respectively. We find that the nonlinear optical properties of the combined system are only modified in the range of one order of magnitude. The observed changes in our experiments in the nonlinear emission can be traced to the changed dielectric environment and thus the modified linear optical properties. The intrinsic nonlinearity of the dielectric used is in fact small when compared to the nonlinearity of the metallic part of the hybrid antennas. Thus, the nonlinear signals generated by the antenna itself are dominant in our experiments. We demonstrate that the well-known nonlinear response of bulk dielectric materials cannot always straightforwardly be used to boost the nonlinear response of nanoscale antenna systems. Our results significantly deepen the understanding of these interesting hybrid systems and offer important guidelines for the design of nanoscale, nonlinear light sources.

scholarly journals Studying the Nonlinear Optical Properties of Fluoride Laser Host Materials in the Ultraviolet Wavelength Region

2021 ◽  
Vol 12 (1) ◽  
pp. 372
Author(s):  
Duong Van Pham ◽  
Diep Van Nguyen ◽  
Tu Xuan Nguyen ◽  
Kieu Anh Thi Doan ◽  
Quan Minh Le ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Ultrashort Pulse ◽  
Nonlinear Refractive Index ◽  
Nonlinear Optical ◽  
Wavelength Region ◽  
Aluminum Fluoride ◽  
Self Focusing ◽  
Host Materials ◽  
Ultraviolet Wavelength

Fluoride host materials doped with trivalent cerium ions have previously been demonstrated as successful laser materials in the ultraviolet wavelength region. However, the nonlinear optical properties of the fluoride hosts in this wavelength region have not been investigated yet, although nonlinearity could result in undesirable effects such as self-focusing and pulse distortion when these fluoride materials are used as gain media in high-power, ultrashort pulse laser oscillator and amplifier systems. In this work, the nonlinear refractive index of lithium calcium aluminum fluoride (LiCaAlF6), lithium strontium aluminum fluoride (LiSrAlF6), lanthanum fluoride (LaF3), and yttrium lithium fluoride (YLiF4) fluoride host materials are determined using the Kramers–Krönig relation model in the ultraviolet wavelength region. Self-focusing conditions, particularly at the peak laser emission wavelength of these materials, are further analyzed. Results show that LiCaAlF6 has the smallest nonlinear refractive index and self-focusing, making it an ideal host material under the conditions of ultrashort pulse and ultrahigh-power laser generation.

Nonlinear optical properties of dielectric nanocolloids: Particle size and concentration effects

2016 ◽  
Vol 25 (04) ◽  
pp. 1650048 ◽  
Author(s):  
M. Y. Salazar-Romero ◽  
M. Alvarez-Ortiz ◽  
A. Balbuena Ortega ◽  
Y. A. Ayala ◽  
A. V. Arzola ◽  
...  
Keyword(s):  
Experimental Study ◽  
Particle Size ◽  
Refractive Index ◽  
Optical Properties ◽  
Nonlinear Optical ◽  
Nonlinear Optical Properties ◽  
Particle Sizes ◽  
Concentration Effects ◽  
Polystyrene Nanospheres ◽  
Order Of Magnitude

The nonlinear optical properties of different samples of dielectric nanocolloids and their application to generate optical spatial solitons in two transverse dimensions are investigated. Each sample is constituted by a suspension of polystyrene nanospheres in water, and we analyze four cases with two different particle sizes (62[Formula: see text]nm and 77[Formula: see text]nm in diameter) and concentrations (0.5% and 1.0% solids). The z-scan technique is used to evaluate and compare the nonlinear refractive index of the nanocolloids. A detailed experimental study on the formation of soliton-like beams as a function of different parameters is also presented. Importantly, the generated solitons propagate along distances exceeding by one order of magnitude the propagation distances observed previously in the same kind of media.

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.

Characterization of nonlinear optical refractive index for graphene oxide–silicon oxide nanohybrid composite

2019 ◽  
Vol 28 (01) ◽  
pp. 1950005 ◽  
Author(s):  
Hamid Darabi ◽  
Mehdi Adelifard ◽  
Yasser Rajabi
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Graphene Oxide ◽  
Nonlinear Refractive Index ◽  
Nonlinear Optical ◽  
Silicon Oxide ◽  
Weight Ratio ◽  
Optical Measurements ◽  
Starting Solution ◽  
Nanohybrid Composite

In this work, Silicon oxide (SiO2) nanoparticles, graphene oxide nanosheet (GO) and GO–SiO2 nanohybrid composites have been synthesized. The role of GO concentration in the starting solution was investigated and correlated to the morphological, structural and optical properties of the studied samples. The structural studies for nanohybrid composites showed that by increasing GO:weight ratio from 0.5 to 2.0, not only does the SiO2 crystalline phase change from cubic to orthorhombic, but the structure of GO also transformed to RGO. The related FESEM images indicate that GO sheets are well-covered by SiO2 nanoparticles with very small grain size and that the accumulation of nanoparticles on each sheet has a high density. Linear Optical measurements showed two optical band gaps of [Formula: see text][Formula: see text]eV and 5.3[Formula: see text]eV for SiO2 nanoparticles, and band gap value of 4.15[Formula: see text]eV for GO nanosheets, which it reduces to 3.3[Formula: see text]eV after formation of the nanohybrid composite with GO: SiO2 weight ratio of 2.0. The nonlinear optical properties of GO–SiO2 with different weight ratio are measured using Z-scan technique. The results showed that the nonlinear refractive index of SiO2 and GO nanoparticles and nanohybrid composite (0.5:1,1:1,2:1) ([Formula: see text]–[Formula: see text]) changed and has a negative sign. It was observed that the nonlinear refractive index changes in different ratios of compounds. Experimental results show that after the formation of the composite, the nonlinear refractive index shows a significant increase in the presence and effectiveness of the GO.

NONLINEAR OPTICAL PROPERTIES OF PbS NANOPARTICLES UNDER CW LASER ILLUMINATION

2000 ◽  
Vol 09 (01) ◽  
pp. 117-125 ◽  
Author(s):  
BAOLONG YU ◽  
YUZONG GU ◽  
YANLI MAO ◽  
CONGSHAN ZHU ◽  
FUXI GAN
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Nonlinear Optical ◽  
Continuous Wave ◽  
Optical Limiting ◽  
Nonlinear Optical Properties ◽  
Pbs Nanoparticles ◽  
Laser Illumination ◽  
Cw Laser ◽  
Thermooptic Coefficient

The thermooptic coefficient dn/dT and the thermal-induced refractive index n2 of PbS nanoparticles in organosol were measured. The optical limiting properties of PbS nanoparticles were studied under continuous wave (cw) laser illumination. The obtained results were analyzed and discussed.

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