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Journal of the Optical Society of America B

Journal of the Optical Society of America B


  • Editor: Henry M. Van Driel
  • Vol. 24, Iss. 4 — Apr. 1, 2007
  • pp: 965–971

Study on six-photon and five-photon ultraviolet upconversion luminescence

Xiaobo Chen and Zengfu Song  »View Author Affiliations

JOSA B, Vol. 24, Issue 4, pp. 965-971 (2007)

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The ultraviolet upconversion luminescence of the Tm 3 + ion sensitized by the Yb 3 + ion in fluoride glass as excited by a 975 nm diode laser was studied. Two typical ultraviolet upconversion luminescence lines positioned at 290.6 and 362.0 nm were found and could be identified as the fluorescence transitions of I 6 1 H 6 3 and D 2 1 H 6 3 , respectively. The elaborative measurement of the variation of upconversion luminescence intensity F as a function of the 975 nm pumping laser power P has proven that the luminescence lines result from five-photon and six-photon upconversion processes, respectively. To our best knowledge, the finding of six-photon ultraviolet upconversion luminescence is original. Moreover, a novel characteristic upconversion luminescence saturation phenomenon was observed, as the log F log P curve of upconversion fluorescence versus pumping laser power is a straight line, while the slopes of these log F log P plots are apparently smaller than the value determined by the normal multiphoton relation. When the pumping laser spot was increased, the slopes were enhanced noticeably from small values to those that are equal to or near what a normal multiphoton relation would determine. The mechanism of this characteristic saturation phenomenon is the energy expansion resulting from the energy resonant migration among Yb 3 + ions.

© 2007 Optical Society of America

OCIS Codes
(190.7220) Nonlinear optics : Upconversion
(250.5230) Optoelectronics : Photoluminescence
(300.6410) Spectroscopy : Spectroscopy, multiphoton

ToC Category:

Original Manuscript: August 30, 2006
Revised Manuscript: December 5, 2006
Manuscript Accepted: December 5, 2006
Published: March 15, 2007

Xiaobo Chen and Zengfu Song, "Study on six-photon and five-photon ultraviolet upconversion luminescence," J. Opt. Soc. Am. B 24, 965-971 (2007)

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