Nonlinear characteristic and optical limiting effect of oil red O azo dye in liquid and solid media

Rekha, R.; Ramalingam, A.

doi:10.1080/09500340902944020

Cited by 17 publications

(12 citation statements)

References 19 publications

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“…When the sample is away from the focus Z=0, the incident laser intensity is low and the normalized transmission is close to 1; when it moves close to the focus, the OA Z-scans exhibits a reduction in the transmission which is symmetric about the focus Z=0 for all concentrations studied. This is typical of an intensity dependent enhanced absorption termed reverse saturable absorption (RSA) or positive nonlinear absorption exhibited by a nonlinear material [13], and can be exploited for protection of eyes and sensors against radiation induced damage.…”

Section: Resultsmentioning

confidence: 99%

“…In most reported experiments, 0.1<S<0.5 has been used for determining nonlinear refraction. S the aperture linear transmittance is given by [13]: (9) with ra denoting the aperture radius( it is 0.5 mm),and, ωa denoting the radius of the laser spot before the aperture (it is 0.015 mm). In our experiment S= 1.12E-4 then (1-1.12E-4) 0.27 = 0.999999999≈ 1) so: Closed aperture Z-scan profile (The defocusing effect) of R610 solid film at concentration 10 -6 , 10 -5 and 10 -4 M for Io= 509.6 GW/cm 2 are shown in Fig.(7).…”

Section: Resultsmentioning

confidence: 99%

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Nonlinear Characterization of Rhodamine 610 dye-doped PMMA Thin Films Under 650 nm CW Laser Light Excitation

Jaffar¹

2017

JNUS

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In this work the nonlinear optical properties for Rodamine 610 (R610) in PMMA doped films with different concentrations with the solvent Chloroform by using a high sensitive method known as Z-Scan technique were studied.Z-scan experiment was performed using CW diode laser at 650 nm with the power output of 45 mW, in two parts. The first part was done using a closed-aperture placed in front of the detector to measure the nonlinear refractive index. In the second part; the aperture in front the detector was removed (open aperture) to measure the nonlinear absorption coefficient. The experimental results for closed aperture show that the dye doped films exhibit negative refractive index (self_defocusing) for the films of concentration 10 -5 and 10 -4 M, while the film of concentration 10 -6 M exhibits positive refractive index (self-focusing), The results show also that the nonlinear refractive index and the third order nonlinear susceptibility increased with the increasing of the concentration due to the increasing of the film thickness which caused increasing the nonlinear phase shift in the samples. With open aperture z-scan the samples exhibit two photon absorption under the experimental conditions. The effective values of the nonlinear refractive index n2, the nonlinear absorption coefficient β, real and imaginary parts of the third-order optical nonlinearity, χ (3) were evaluated. The results imply that R610 films can be used as a potential medium for various optoelectronic applications including that in optical power limiting.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Nonlinear Characterization of Rhodamine 610 dye-doped PMMA Thin Films Under 650 nm CW Laser Light Excitation

Jaffar¹

2017

JNUS

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“…The densities of all the synthesized compounds were evaluated from the slope of plots of 1 12 1 g  verses 21 gg . The inverse of slope gives density of compound (ρ 2 ).…”

Section: Physicochemical Studiesmentioning

confidence: 99%

“…Further, these properties are useful for the adequate designing of industrial processes [17][18][19], fermentation [20], dyes [21], canning and preservation of food [22][23] etc. Nowadays, refractive index is used in research related to medical sciences and biotechnology [24][25].…”

Section: Introductionmentioning

confidence: 99%

Physicochemical properties of some tetrahydropyrimidine derivatives

Baluja¹,

Patel²

2018

ELSR

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Production of tetrahydropyrimidine and their derivatives is of great importance in organic chemistry. Presence of pyrimidine piece in different biological compounds that are used in several medications makes it a crucial component. In this study, some new tetrahydropyrimidine compounds are synthesized and their physicochemical properties such as such as density, refractive index, partition coefficients have been studied in different solvents at 308.15K.

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“…al. 2009 studied nonlinear characteristic and optical limiting effect of oil red O azo dye in liquid and solid media [7]. Muto et al (1998 [8]) shown that the nonlinear response of disperse red1 (DR1) dye with PMMA at 532 nm increases with increasing concentration up to 1 wt% of DR1 in PMMA and decreases for larger concentration.…”

Section: Introductionmentioning

confidence: 99%