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System and method for fabricating distributed Bragg reflectors with preferred properties

  • US 6,084,998 A
  • Filed: 12/30/1998
  • Issued: 07/04/2000
  • Est. Priority Date: 12/30/1998
  • Status: Expired due to Fees
First Claim
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1. In a method for imaging light transmitting media oriented along a workpiece axis by directing two co-propagating coherent light beams having known beam amplitudes and beam pitch at the media transversely to the workpiece axis so that the beams interfere to produce a permanent fringe pattern in the media having a commensurate fringe amplitude and fringe pitch, the improvement comprising:

  • (1) directing the co-propagating coherent beams parallel to said workpiece axis;

    (2) redirecting the beams from a direction parallel to the workpiece axis to a direction perpendicular to the workpiece axis while maintaining said beam pitch;

    (3) further redirecting the beams from a direction perpendicular to the workpiece axis to respective converging directions whereby the beams interfere to produce a fringe pattern in the media;

    (4) synchronously rotating the coherent beams of steps (1) and (2) and the converging beams of step (3) about the workpiece axis, thereby producing a pattern of substantially circularly symmetric fringes in the media.

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