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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 47, Iss. 31 — Nov. 1, 2008
  • pp: 5853–5861

In-vacuum optical isolation changes by heating in a Faraday isolator

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Applied Optics, Vol. 47, Issue 31, pp. 5853-5861 (2008)
http://dx.doi.org/10.1364/AO.47.005853


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Abstract

We describe a model evaluating changes in the optical isolation of a Faraday isolator when passing from air to vacuum in terms of different thermal effects in the crystal. The changes are particularly significant in the crystal thermal lensing (refraction index and thermal expansion) and in its Verdet constant and can be ascribed to the less efficient convection cooling of the magneto-optic crystal of the Faraday isolator. An isolation decrease by a factor of 10 is experimentally observed in a Faraday isolator that is used in a gravitational wave experiment (Virgo) with a 10   W input laser when going from air to vacuum. A finite element model simulation reproduces with a great accuracy the experimental data measured on Virgo and on a test bench. A first set of measurements of the thermal lensing has been used to characterize the losses of the crystal, which depend on the sample. The isolation factor measured on Virgo confirms the simulation model and the absorption losses of 0.0016 ± 0.0002 / cm for the TGG magneto-optic crystal used in the Faraday isolator.

© 2008 Optical Society of America

OCIS Codes
(140.6810) Lasers and laser optics : Thermal effects
(230.2240) Optical devices : Faraday effect

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: February 14, 2008
Revised Manuscript: August 12, 2008
Manuscript Accepted: August 20, 2008
Published: October 28, 2008

Citation
The Virgo Collaboration, "In-vacuum optical isolation changes by heating in a Faraday isolator," Appl. Opt. 47, 5853-5861 (2008)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-47-31-5853

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