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Range gated remote measurement utilizing two-photon absorption

  • US 6,384,903 B1
  • Filed: 02/28/1977
  • Issued: 05/07/2002
  • Est. Priority Date: 02/28/1977
  • Status: Expired due to Term
First Claim
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1. Apparatus for making remote atomic absorption measurements comprising:

  • means, including two collimated counter-propagating beams of coherent energy, for establishing two-photon absorption in the earth'"'"'s atmosphere at a number of selectable locations along the direction of said beams, and, means for measuring a two-photon absorption related characteristic of one of said beams after said one beam has participated in establishing two-photon absorption at a selected location.

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