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Title: A scanning, all-fiber Sagnac interferometer for high resolution magneto-optic measurements at 820 nm

The Sagnac Interferometer has historically been used for detecting non-reciprocal phenomena, such as rotation. We demonstrate an apparatus in which this technique is employed for high resolution measurements of the Magneto-Optical Polar Kerr effect—a direct indicator of magnetism. Previous designs have incorporated free-space components which are bulky and difficult to align. We improve upon this technique by using all fiber-optic coupled components and demonstrate operation at a new wavelength, 820 nm, with which we can achieve better than 1 μrad resolution. Mounting the system on a piezo-electric scanner allows us to acquire diffraction limited images with 1.5 μm spatial resolution. We also provide extensive discussion on the details and of the Sagnac Interferometer's construction.
Authors:
 [1] ;  [2] ;  [3] ;  [2] ;  [1] ;  [2] ;  [2]
  1. Department of Physics, Stanford University, Stanford, California 94305 (United States)
  2. (United States)
  3. Department of Applied Physics, Stanford University, Stanford, California 94305 (United States)
Publication Date:
OSTI Identifier:
22306225
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 85; Journal Issue: 10; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; DIFFRACTION; FIBER OPTICS; INTERFEROMETERS; KERR EFFECT; MAGNETISM; ROTATION; SPATIAL RESOLUTION; WAVELENGTHS