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Nature 187, 493 - 494 (06 August 1960); doi:10.1038/187493a0

Stimulated Optical Radiation in Ruby


Hughes Research Laboratories, A Division of Hughes Aircraft Co., Malibu, California.

Schawlow and Townes1 have proposed a technique for the generation of very monochromatic radiation in the infra-red optical region of the spectrum using an alkali vapour as the active medium. Javan2 and Sanders3 have discussed proposals involving electron-excited gaseous systems. In this laboratory an optical pumping technique has been successfully applied to a fluorescent solid resulting in the attainment of negative temperatures and stimulated optical emission at a wave-length of 6943 Å. ; the active material used was ruby (chromium in corundum).

  1. Schawlow, A. L. , and Townes, C. H. , Phys. Rev., 112, 1940 (1958). | Article | ISI | ChemPort |
  2. Javan, A. , Phys. Rev. Letters, 3, 87 (1959). | Article | ISI |
  3. Sanders, J. H. , Phys. Rev. Letters, 3, 86 (1959). | Article | ISI | ChemPort |
  4. Maiman, T. H. , Phys. Rev. Letters, 4, 564 (1960). | Article | ISI |

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