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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 49, Iss. 25 — Sep. 1, 2010
  • pp: 4780–4790

In-vacuum Faraday isolation remote tuning

The Virgo Collaboration  »View Author Affiliations

Applied Optics, Vol. 49, Issue 25, pp. 4780-4790 (2010)

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In-vacuum Faraday isolators (FIs) are used in gravitational wave interferometers to prevent the disturbance caused by light reflected back to the input port from the interferometer itself. The efficiency of the optical isolation is becoming more critical with the increase of laser input power. An in-vacuum FI, used in a gravitational wave experiment (Virgo), has a 20 mm clear aperture and is illuminated by an almost 20 W incoming beam, having a diameter of about 5 mm . When going in vacuum at 10 6 mbar , a degradation of the isolation exceeding 10 dB was observed. A remotely controlled system using a motorized λ / 2 waveplate inserted between the first polarizer and the Faraday rotator has proven its capability to restore the optical isolation to a value close to the one set up in air.

© 2010 Optical Society of America

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

ToC Category:
Optical Devices

Original Manuscript: April 29, 2010
Manuscript Accepted: July 5, 2010
Published: August 27, 2010

The Virgo Collaboration , "In-vacuum Faraday isolation remote tuning," Appl. Opt. 49, 4780-4790 (2010)

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