Comparison of calculated and measured refractive index profiles of continuous wave ultravoilet written waveguides in LiNbO3 and its analysis by effective index based matrix method

2015 ◽  
Vol 117 (5) ◽  
pp. 053106 ◽  
Author(s):  
Tapas Ghosh ◽  
Bidyut Samanta ◽  
Paresh Chandra Jana ◽  
Pranabendu Ganguly
Keyword(s):  
Refractive Index ◽  
Matrix Method ◽  
Continuous Wave ◽  
Effective Index ◽  
Its Analysis

Design of a Directional Coupler based on UV-Induced LiNbO3 Waveguides

2017 ◽  
Vol 38 (3) ◽  
Author(s):  
T. Ghosh ◽  
B. Samanta ◽  
P. C. Jana ◽  
P. Ganguly
Keyword(s):  
Matrix Method ◽  
Directional Coupler ◽  
Continuous Wave ◽  
Effective Index ◽  
Coupling Length ◽  
Pure Bending ◽  
Analytical Technique ◽  
Bending Loss ◽  
Transition Length

AbstractA semi-analytical technique, effective index-based matrix method (EIMM), has been applied to determine the coupling length of continuous wave UV-written directional coupler for different gaps between the waveguides as well as the pure bending loss and transition loss of S-curved waveguides estimated to optimize the transition length (

Investigating the Nonlinear Optical Response of Pepper Oil under Low Power Irradiation with Continuous Wave Visible Laser Beam

2020 ◽  
pp. 131-138
Keyword(s):  
Refractive Index ◽  
Nonlinear Refractive Index ◽  
Nonlinear Optical ◽  
Continuous Wave ◽  
Diffraction Integral ◽  
Visible Laser ◽  
Limiting Property ◽  
Kirchhoff Diffraction Integral ◽  
Theoretical Results ◽  
Good Agreement

The nonlinear optical properties of pepper oil are studied by diffraction ring patterns and Z-scan techniques with continuous wave beam from solid state laser at 473 nm wavelength. The nonlinear refractive index of the sample is calculated by both techniques. The sample show high nonlinear refractive index. Based on Fresnel-Kirchhoff diffraction integral, the far-field intensity distributions of ring patterns have been calculated. It is found that the experimental results are in good agreement with the theoretical results. Also the optical limiting property of pepper oil is reported. The results obtained in this study prove that the pepper oil has applications in nonlinear optical devices.

Comparative study between the results of effective index based matrix method and characterization of fabricated SU-8 waveguide

2017 ◽  
Vol 382 ◽  
pp. 632-638 ◽  
Author(s):  
Swagata Samanta ◽  
Pradip Kumar Dey ◽  
Pallab Banerji ◽  
Pranabendu Ganguly
Keyword(s):  
Comparative Study ◽  
Matrix Method ◽  
Effective Index

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.

Effective-index-based matrix method: a computationally simpler alternative to BPM for integrated optics design

1999 ◽  
Author(s):  
S. K. Lahiri ◽  
J. C. Biswas ◽  
P. Ganguly ◽  
Rabindra N. Chakraborty
Keyword(s):  
Integrated Optics ◽  
Matrix Method ◽  
Effective Index ◽  
Optics Design

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.

Continuous-wave measurement of the fiber nonlinear refractive index

1998 ◽  
Vol 23 (16) ◽  
pp. 1274 ◽  
Author(s):  
D. Monzón-Hernández ◽  
A. N. Starodumov ◽  
Yu. O. Barmenkov ◽  
I. Torres-Gómez ◽  
F. Mendoza-Santoyo
Keyword(s):  
Refractive Index ◽  
Nonlinear Refractive Index ◽  
Continuous Wave ◽  
Wave Measurement
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