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Coated optics to improve durability

  • US 6,872,479 B2
  • Filed: 11/18/2003
  • Issued: 03/29/2005
  • Est. Priority Date: 04/11/2003
  • Status: Active Grant
First Claim
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1. A coated optical material suitable for use as an optical path material in lasers operating below 250 nm comprising:

  • a shaped optical monocrystal having an entry face and an exit face for laser radiation entering and exiting said crystal, and a coating on at least the exit face of said monocrystal, said coating selected from the group consisting of MgF2 doped fused silica and fluorine doped fused silica;

    wherein when the coating is MgF2 doped fused silica and the MgF2 content of said MgF2 doped fused silica is in the range of 0.2% to 4% by weight; and

    wherein when the coating is fluorine doped fused silica and the fluorine content of said fluorine doped fused silica is in the range of 0.2 to 4% by weight.

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