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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Vol. 14, Iss. 3 — Mar. 1, 1997
  • pp: 553–559

Site-selective energy upconversion in CaF2:Ho3+

S. Ray Bullock, B. R. Reddy, P. Venkateswarlu, and S. K. Nash-Stevenson  »View Author Affiliations


JOSA B, Vol. 14, Issue 3, pp. 553-559 (1997)
http://dx.doi.org/10.1364/JOSAB.14.000553


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Abstract

From the absorption spectrum of CaF2:Ho3+, Judd–Ofelt intensity parameters were estimated as Ω2=0.018×10-20 cm2, Ω4=0.57×10-20 cm2, and Ω6=0.587×10-20 cm2. Radiative transition probabilities and radiative lifetimes were also estimated for some of the levels. We observed red-to-green, -blue, and -violet energy upconversion in CaF2:Ho3+ with efficiencies of 0.08%, 0.13% and 1.35×10-3%, respectively, on resonant excitation of the 5F5 state. Under site-selective excitation we also found that the blue-upconversion signal intensity was approximately three times larger than that of the green-upconversion signal intensity. On resonantly exciting the 5I4 state we detected strong green upconversion signals from the 5S2 state and found that excited-state absorption from 5I7 was responsible for this process. Upconversion efficiency of the process was determined to be 8.1%. On resonantly exciting the 5I5 state, we detected strong red emission in CaF2:Ho3+ and strong green emission in LaF3:Ho3+. Such a host-dependent upconversion frequency emission is also explained.

© 1997 Optical Society of America

Citation
S. Ray Bullock, B. R. Reddy, P. Venkateswarlu, and S. K. Nash-Stevenson, "Site-selective energy upconversion in CaF2:Ho3+," J. Opt. Soc. Am. B 14, 553-559 (1997)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-14-3-553

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