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Optics Letters

Optics Letters


  • Vol. 25, Iss. 17 — Sep. 1, 2000
  • pp: 1258–1260

Spatial redistribution of energy in a nanosecond laser pulse by an organic optical limiter

John Robertson, Phil Milsom, Jason Duignan, and Grant Bourhill  »View Author Affiliations

Optics Letters, Vol. 25, Issue 17, pp. 1258-1260 (2000)

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The spatial redistribution of energy resulting from the interaction between a near-diffraction-limited nanosecond laser pulse and the nonlinear absorbing optical limiting dye silicon naphthalocyanine is described, for what is to our knowledge the first time, in an optical geometry that is likely to be found in practical applications. For input fluences above that required for nonlinear absorption but below that for bubble growth, a plane wave or Gaussian spatial input evolves unexpectedly to a sharp central spike and a well-defined outer ring. The observed energy redistribution is thought to rely on a combination of nonlinear processes, since a pure absorptive process alone cannot explain the profiles presented. A model involving nonlinear absorption and nonlinear refraction qualitatively reproduces the observed spatial profiles. It is clear from the results that the performance of optical limiting dyes in representative optical geometries, even at fluences well below that required for bubble growth, cannot be described solely by nonlinear absorption.

© 2000 Optical Society of America

OCIS Codes
(140.3360) Lasers and laser optics : Laser safety and eye protection
(140.3380) Lasers and laser optics : Laser materials
(140.6810) Lasers and laser optics : Thermal effects
(160.4760) Materials : Optical properties
(160.4890) Materials : Organic materials
(190.4400) Nonlinear optics : Nonlinear optics, materials

John Robertson, Phil Milsom, Jason Duignan, and Grant Bourhill, "Spatial redistribution of energy in a nanosecond laser pulse by an organic optical limiter," Opt. Lett. 25, 1258-1260 (2000)

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