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Optics Letters

Optics Letters


  • Vol. 22, Iss. 2 — Jan. 15, 1997
  • pp: 123–125

Nonlinear dispersion of avalanche upconversion

Q. Shu, H. Ni, and S. C. Rand  »View Author Affiliations

Optics Letters, Vol. 22, Issue 2, pp. 123-125 (1997)

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Two-beam coupling measurements of an avalanche upconversion transition in concentrated Tm:LiYF 4 confirm that, despite the resonant nature of the excited-state optical interaction, the induced response is strongly dispersive. This surprising characteristic is shown to be a general feature of avalanche polarization, with an off-resonant process dominating the resonant response.

© 1997 Optical Society of America

Q. Shu, H. Ni, and S. C. Rand, "Nonlinear dispersion of avalanche upconversion," Opt. Lett. 22, 123-125 (1997)

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  15. ρr can be calculated by use of the standard four-level model,8 as we have done, or it can be treated as a free parameter.

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