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Measurement of nonlinear refractive index in open-aperture Z-scan experiments

Abstract

We present an experimental study on measurement of nonlinear refractive index (n 2) of organic liquids when the thermo-optic effects manifest into large nonlinear phase shifts (Δϕ 0) in an open-aperture Z-scan configuration. Although we do not obtain the familiar peak–valley normalized transmittance curve as in the case of closed-aperture Z-scan technique, we use a theoretical model using Gaussian beam decomposition (GD) technique to estimate the value of n 2. Using this recipe, we obtain the nonlinear refractive index n 2 = −(4.90 ± 1.20) × 10−15 cm2/W for toluene (organic solvent) and n 2 = −(10.60 ± 2.10) × 10−15 cm2/W for an organic polymer solution (10−4 M in toluene). By carrying out absorption measurements directly with an unfocussed Gaussian beam, we found nonlinear absorptions β tol = (2.42 ± 0.20) × 10−13 m/W and β poly = (2.79 ± 0.24) × 10−13 m/W which are close to the expected results.

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Correspondence to RITWICK DAS.

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DAS, R., SHUKLA, M.K. Measurement of nonlinear refractive index in open-aperture Z-scan experiments. Pramana - J Phys 83, 985–994 (2014). https://doi.org/10.1007/s12043-014-0819-1

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Keywords

  • Nonlinear refractive index
  • nonlinear phase
  • Gaussian beam

PACS Nos

  • 42.70.Mp
  • 42.65.Hw