Selfaction effects of femtosecond laser pulses in dye-doped
5CB liquid crystal

Gayvoronsky, V. Ya.; Yakunin, Sergii; Enikeeva, V. A.; Ozheredov, I. A.; Shkurinov, A. P.

doi:10.1002/lapl.200610010

Cited by 9 publications

(5 citation statements)

References 19 publications

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“…The light-induced optical changes for different angles θ e between E and n 0 were studied using a planar cell where θ e could vary from 0 [8][9][10]. The focal length of the lens was 85 mm.…”

Section: Methodsmentioning

confidence: 99%

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Sign inversion of the optical torque on the nematic director enhanced by anthraquinone dye dopants stable to the light action

et al. 2006

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By analyzing the total and on-axis transmittance of the laser beam we studied the enhanced light-induced director reorientation (Jánossy effect) in a nematic liquid crystal doped with anthraquinone dye molecules that do not have photoinduced conformational transformations. The obtained dependence on the angle between the light polarization E and the initial director n0 shows: first order director reorientation (DR) transition with hysteresis for E⊥n0; second order reversible DR transition with the extremely low threshold intensity for E n0; sign inversion of the nonlinear refractive index and DR in the intermediate geometry. The data suggest a presence of two different kinds of dipoles in the system: those absorbing light and those giving rise to the nonlinear refractive index.Abberation rings pattern in far field of the beam passed through the cell with the dye-doped nematic liquid crystal

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Section: Methodsmentioning

confidence: 99%

“…We measured variations of the transmittance of the LC cell vs laser intensity I by investigating distortions of the focused laser beam passing through the sample, Fig. 1 [8][9][10]. The focal length of the lens was 85 mm.…”

Section: Methodsmentioning

confidence: 99%

Sign inversion of the optical torque on the nematic director enhanced by anthraquinone dye dopants stable to the light action

et al. 2006

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“…This technique has some advantages in comparison with well-known zscan technique. The detailed description of the experimental setup and the calculation method has been reported in our previous works [15][16][17].…”

Section: Methodsmentioning

confidence: 99%

Enhancement of two-photon absorption in anisotropic mesoporous silicon

et al. 2008

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Abstract:In experiments on nonlinear-optical transmission of picosecond laser pulses at the wavelength of 1.064 μm threeorder-of-magnitude enhancement of the photoinduced absorption in optically anisotropic mesoporous silicon films compared to crystalline silicon (c-Si) was found. The effect is not sensitive to the polarization of the laser radiation and it saturates at laser peak intensities about 5 MW/cm 2 . Higher laser intensity results in the polarization-sensitive photoinduced absorption, which is merely one-order-of-magnitude more effective than in c-Si. These efficient nonlinear-optical responses can be attributed to the resonant excitation of the defect states in the direct gap of silicon and local-field enhancement in the mesoporous films. Total transmittance of the birefringent mesoporous silicon film versus the laser intensity for the sample of 49% porosity. The crystallographic direction [001] corresponds to the optical axis

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“…Pulsed peak intensity above the GW cm −2 has recently lead to the measurement of coherently excited Kerr effect [13]. Selfaction effect of 100 fs pulses in a thin absorbing nematic layer has also been reported [14].…”

Section: Introductionmentioning

confidence: 98%

Thermally-induced nonlinear spatial shaping of infrared femtosecond pulses in nematic liquid crystals

Pietro¹,

Jullien²,

Bortolozzo³

et al. 2018

Laser Phys. Lett.

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An optically-induced thermal non-linear effect in a nematic liquid-crystal (E7) cell is evidenced through weak light-absorption by the ITO coating of an infrared pulsed femtosecond laser (λ 0 = 1.5 µm). Strong spatial self-phase modulation is generated, thus a multiple-ring pattern is observed in the far-field. The sign of the nonlinearity is changed depending on the laser polarization. The refractive index and thermal gradients are measured as a function of the laser intensity and we observe that the temperature can increase close to the nematic phase transition. The fidelity and stability of the process open new prospects for spatial shaping devices and delimits the operating wavelength range for ultrafast liquid-crystal based electro-optic application.

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Selfaction effects of femtosecond laser pulses in dye-doped 5CB liquid crystal

Cited by 9 publications

References 19 publications

Sign inversion of the optical torque on the nematic director enhanced by anthraquinone dye dopants stable to the light action

Sign inversion of the optical torque on the nematic director enhanced by anthraquinone dye dopants stable to the light action

Enhancement of two-photon absorption in anisotropic mesoporous silicon

Thermally-induced nonlinear spatial shaping of infrared femtosecond pulses in nematic liquid crystals

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