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Optical measuring system

  • US 7,847,227 B2
  • Filed: 10/29/2007
  • Issued: 12/07/2010
  • Est. Priority Date: 12/12/2003
  • Status: Expired due to Fees
First Claim
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1. Apparatus for characterising a spatially coherent beam of light, comprising:

  • a LCOS SLM arranged so that a said beam of light can be incident upon it;

    means for causing the LCOS SLM to display a first hologram pattern;

    means for causing the LCDS SLM to display a second hologram pattern at a location in said beam where the amplitude and phase of the beam are to be characterised;

    means for changing the second hologram pattern displayed on the LCDOS SLM; and

    means for measuring an intensity of light to determine the effect of said change of hologram pattern.

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