Studies on thermally induced third-order optical nonlinearity and optical power limiting response of Azure B under CW He-Ne laser excitation

S. Pramodini, Deepika, Sandhya, Ashok Rao, P. Poornesh

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

We present the characterizations of thermally induced third-order nonlinearity, optical power limiting and self-induced diffraction rings in Azure B dye. Nonlinear measurements were carried out by employing the single beam z-scan technique. He-Ne laser operating in continuous wave mode at 633 nm wavelength was used as the source of excitation. Azure B possesses self-defocusing type of nonlinearity. Self-diffraction rings pattern were observed due to thermal lensing and change in the refractive index. Nonlinear absorption process in Azure B was due to the reverse saturable absorption. The nonlinear refractive index n2, the nonlinear absorption coefficient βeff and the third-order optical susceptibility χ(3) were found to be of the order 10-5 esu, 10 -2 cm/W and 10-7 esu respectively. Azure B also displays good optical power handling capability of laser beam at the experimental wavelength, indicating the possible photonics device application such as all-optical power limiting.

Original languageEnglish
Pages (from-to)58-62
Number of pages5
JournalOptics and Laser Technology
Volume62
DOIs
Publication statusPublished - 01-01-2014

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Laser excitation
Refractive index
Diffraction
nonlinearity
refractivity
Wavelength
Photonic devices
thermal lensing
rings
defocusing
Laser modes
diffraction
wavelengths
excitation
continuous radiation
lasers
Laser beams
absorptivity
Dyes
dyes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

Cite this

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abstract = "We present the characterizations of thermally induced third-order nonlinearity, optical power limiting and self-induced diffraction rings in Azure B dye. Nonlinear measurements were carried out by employing the single beam z-scan technique. He-Ne laser operating in continuous wave mode at 633 nm wavelength was used as the source of excitation. Azure B possesses self-defocusing type of nonlinearity. Self-diffraction rings pattern were observed due to thermal lensing and change in the refractive index. Nonlinear absorption process in Azure B was due to the reverse saturable absorption. The nonlinear refractive index n2, the nonlinear absorption coefficient βeff and the third-order optical susceptibility χ(3) were found to be of the order 10-5 esu, 10 -2 cm/W and 10-7 esu respectively. Azure B also displays good optical power handling capability of laser beam at the experimental wavelength, indicating the possible photonics device application such as all-optical power limiting.",
author = "S. Pramodini and Deepika and Sandhya and Ashok Rao and P. Poornesh",
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T1 - Studies on thermally induced third-order optical nonlinearity and optical power limiting response of Azure B under CW He-Ne laser excitation

AU - Pramodini, S.

AU - Deepika,

AU - Sandhya,

AU - Rao, Ashok

AU - Poornesh, P.

PY - 2014/1/1

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N2 - We present the characterizations of thermally induced third-order nonlinearity, optical power limiting and self-induced diffraction rings in Azure B dye. Nonlinear measurements were carried out by employing the single beam z-scan technique. He-Ne laser operating in continuous wave mode at 633 nm wavelength was used as the source of excitation. Azure B possesses self-defocusing type of nonlinearity. Self-diffraction rings pattern were observed due to thermal lensing and change in the refractive index. Nonlinear absorption process in Azure B was due to the reverse saturable absorption. The nonlinear refractive index n2, the nonlinear absorption coefficient βeff and the third-order optical susceptibility χ(3) were found to be of the order 10-5 esu, 10 -2 cm/W and 10-7 esu respectively. Azure B also displays good optical power handling capability of laser beam at the experimental wavelength, indicating the possible photonics device application such as all-optical power limiting.

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