scholarly journals SOME ASPECTS OF THE MATERIALS’ OPTICAL LIMITING FEATURES

2020 ◽  
Vol 1 ◽  
pp. 33-36
Author(s):  
Natalia Kamanina
Keyword(s):  
High Frequency ◽  
Kerr Effect ◽  
Optical Limiting ◽  
Reverse Saturation Absorption ◽  
High Laser ◽  
Effective Use ◽  
Human Eyes ◽  
Saturation Absorption ◽  
Display Technique ◽  
Good Coincidence

Due to the effective use of the fullerenes and other nanoparticles in the materials for the general optoelectronic, laser and display technique, as well as for biomedicine, the different mechanisms to attenuate the light intensity are considered with good advantage in order to protect the human eyes and technical devises from high laser irradiation. Reverse saturation absorption, complex formation, scattering, etc. are taken into account. In the current paper the influence of the content of the nanoobjects on the interface relief is shown and considered as an additional possible optical limiting mechanism. Moreover, the diffraction from the nanostructured materials via high frequency Kerr effect is added to extend the numbers of the optical limiting mechanisms. Different experimental instruments and supporting models are presented. VIS lasers, AFM, OCA devises are applied to test and visualize the results. Theoretical and experimental data are in good coincidence.

Ultrafast broadband reverse saturation absorption in Al-doped InSe thin films for optical limiting at visible/near-infrared

2020 ◽  
Vol 108 ◽  
pp. 110171 ◽  
Author(s):  
Xiaoyan Yan ◽  
Xingzhi Wu ◽  
Yu Fang ◽  
Wenjun Sun ◽  
Chengbao Yao ◽  
...  
Keyword(s):  
Thin Films ◽  
Near Infrared ◽  
Optical Limiting ◽  
Reverse Saturation Absorption ◽  
Saturation Absorption

Reverse saturation absorption spectra and optical limiting properties of chlorinated tetrasubstituted phthalocyanines containing different metals

2012 ◽  
Vol 34 (11) ◽  
pp. 1869-1877 ◽  
Author(s):  
Ahmad Tuhl ◽  
Hacene Manaa ◽  
Saad Makhseed ◽  
Nouria Al-Awadi ◽  
Jacob Mathew ◽  
...  
Keyword(s):  
Absorption Spectra ◽  
Optical Limiting ◽  
Reverse Saturation Absorption ◽  
Saturation Absorption

OPTICAL AND STRUCTURAL PROPERTIES OF SILVER NANOPARTICLES EMBEDDED IN INDIUM OXIDE FILMS

2011 ◽  
Vol 10 (03) ◽  
pp. 433-440 ◽  
Author(s):  
A. A. DAKHEL ◽  
F. Z. HENARI
Keyword(s):  
Indium Oxide ◽  
Nonlinear Optical ◽  
Silicon Substrates ◽  
X Ray Diffraction ◽  
Third Order ◽  
X Ray ◽  
Reverse Saturation Absorption ◽  
Saturation Absorption ◽  
Order Susceptibility ◽  
Nanoparticles Of Silver

Nanoparticles of silver-embedded indium oxide thin films have been prepared on glass and silicon substrates. Silver concentration were 3 wt.% and 5 wt.% as measured by X-ray fluorescence. X-ray diffraction reveals that indium oxide of these samples remains amorphous even after pre-annealing at 400°C. The optical absorption of the samples manifests the surface plasmon resonance (SPR) phenomena, which varies with Ag content. The Ag nanoparticles radius was estimated with Mie classical theory by using the SPR data analysis. The nonlinear optical properties of films on glass substrate were investigated using z-scan technique. Under cw excitation the films exhibit large reverse saturation absorption and negative nonlinearities. The real and imaginary parts of third order susceptibility of the samples were measured and the imaginary part which arise from the change in absorption is found to be dominant.

scholarly journals Effective use of various minimally invasive technologies eliminating vertical reflux in the treatment of chronic diseases of the lower limb veins

2020 ◽  
Vol 73 (2) ◽  
pp. 329-331
Author(s):  
Serhiy I. Savolyuk ◽  
Valentyn A. Khodos ◽  
Roman A. Herashchenko ◽  
Vladyslav S. Horbovets
Keyword(s):  
Lower Limb ◽  
High Frequency ◽  
Long Term Results ◽  
Laser Coagulation ◽  
Results Of Treatment ◽  
Functional Classes ◽  
Group 3 ◽  
Group 2 ◽  
Effective Use

The aim: To analyze and evaluate the efficacy of CDLLV treatment, using high-frequency endovascular welding (EVW), endovenous laser coagulation (EVLC) and catheter microfoam echosclerotherapy. Materials and methods: We have treated 329 patients with CDLLV C2-C6 functional classes according to the Clinical Etiological Anatomical Pathophysiology. Of these, 102 patients had vertical reflux eliminated by EVW, in 112 – by EVLC, and in 115 – by catheter microfoam echosclerotherapy. Results: In the EVW group 3 patients (2.94%) had a partial recanalization of coagulated veins 3 months after the procedure. In EVLC group 2 patients (1.79%) also had partial recanalization group after 6 months. In the group of catheter microfoam echosclerotherapy partial recanalization occurred in 3 patients during 3 months of observation, in the period of 6 months – in 2, in the period of 12 months – in 9, in total – in 14 patients (12.17%). The EVW and EVLC methods showed high efficacy of vertical reflux elimination on the great and small subcutaneous veins (GSV/SSV) in CDLLV and have no fundamental differences in the immediate and long-term results of treatment. Microfoam catheter echosclerotherapy leads to a greater number of recanalisations, compared with EVW and EVLC. Conclusions: High-frequency endovenous welding results in complete fibrotic GSV/SSV transformation in 97.06% of patients. Endovascular laser coagulation results in complete fibrotic GSV/SSV transformation in 98.21% of patients. Elimination of vertical reflux by microfoam echosclerotherapy results in complete fibrotic GSV/SSV transformation in 87.83% of patients.

Nonlinear reverse saturation absorption, self-defocusing behavior and structure-property relationship of a novel 2,3,4-trimethoxy-4'-nitrochalcone single crystal

2019 ◽  
Vol 1193 ◽  
pp. 177-184
Author(s):  
S. Raghavendra ◽  
T. Chandra Shekhara Shetty ◽  
C.S. Chidan Kumar ◽  
Shivaraj R. Maidur ◽  
Parutagouda Shankaragouda Patil ◽  
...  
Keyword(s):  
Single Crystal ◽  
Structure Property ◽  
Property Relationship ◽  
Reverse Saturation Absorption ◽  
Structure Property Relationship ◽  
Relationship Of ◽  
Saturation Absorption

scholarly journals Nonlinear Optical Characteristics of Crystal VioletDye Doped Polystyrene Films by Using Z-Scan Technique

2017 ◽  
Vol 27 (5) ◽  
pp. 83 ◽  
Author(s):  
Mahasin F. Hadi ◽  
Eman Mohi Alwaan ◽  
Wafaa Hameed Abass
Keyword(s):  
Nonlinear Optical ◽  
Laser Light ◽  
Nonlinear Refraction ◽  
Closed Aperture ◽  
Experimental Conditions ◽  
Light Pulses ◽  
Reverse Saturation Absorption ◽  
Self Focusing ◽  
Saturation Absorption ◽  
Doping Ratio

Z-scan technique was employed to study the nonlinear optical properties (nonlinear refractive index and nonlinear absorption coefficient) for crystal violet doped polystyrene films as a function of doping ratio in chloroform solvent. Samples exhibits in closed aperture Z-scan positive nonlinear refraction (self-focusing). While in the open aperture Z-scan gives reverse saturation absorption (RSA) (positive absorption) for all film with different doping ratio making samples candidates for optical limiting devices for protection of sensors and eyes from energetic laser light pulses under the experimental conditions.

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