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Optica Publishing Group
  • Chinese Optics Letters
  • Vol. 11,
  • Issue 10,
  • pp. 102601-
  • (2013)

Method for in situ calibration of multiple feedback interferometers

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Abstract

A method is presented for in situ resolution calibration of multiple feedback interferometers (MFIs) using two lasers with different feedback levels simultaneously. The laser with weak optical feedback level generates half-wavelength optical fringes, whereas the laser with strong multiple feedback level generates optical nano-fringes. By using this method, the number of displaced optical nano-fringes can be easily counted, and the resolution of the MFIs can be accurately determined. The integrated MFIs can be used to measure displacements and calibrate other displacement sensors.

© 2013 Chinese Optics Letters

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