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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 13, Iss. 20 — Oct. 3, 2005
  • pp: 7893–7898

Upconversion luminescence from 2E state of Cr3+ in Al2O3 crystal by infrared femtosecond laser irradiation

Lu-Yun Yang, Yong-Jun Dong, Dan-Ping Chen, Cheng Wang, Nin Da, XiongWei Jiang, Conghan Zhu, and Jiang-rong Qiu  »View Author Affiliations

Optics Express, Vol. 13, Issue 20, pp. 7893-7898 (2005)

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Visible upconversion luminescence was observed in Cr3+: Al2O3 crystal under focused femtosecond laser irradiation. The luminescence spectra show that the upconversion luminescence originates from the 2E-4A2 transition of Cr3+. The dependence of the fluorescence intensity of Cr3+ on the pump power reveals that a two-photon absorption process dominates in the conversion of infrared radiation to the visible emission. It is suggested that the simultaneous absorption of two infrared photons produces the population of upper excited states, which leads to the characteristic visible emission from 2E state of Cr3+.

© 2005 Optical Society of America

OCIS Codes
(140.7090) Lasers and laser optics : Ultrafast lasers
(160.6990) Materials : Transition-metal-doped materials
(190.4180) Nonlinear optics : Multiphoton processes
(190.7220) Nonlinear optics : Upconversion

ToC Category:
Research Papers

Original Manuscript: August 16, 2005
Revised Manuscript: September 16, 2005
Published: October 3, 2005

Lu-Yun Yang, Yong-Jun Dong, Dan-Ping Chen, Cheng Wang, Nin Da, XiongWei Jiang, Conghan Zhu, and Jiang-rong Qiu, "Upconversion luminescence from 2E state of Cr3+ in Al2O3 crystal by infrared femtosecond laser irradiation," Opt. Express 13, 7893-7898 (2005)

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Fig. 1. Fig. 2. Fig. 3.

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