Upconversion processes in Yb-sensitized Tm:ZBLAN

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A spectroscopic study of 22 rare-earth-ion doped ZBLAN (fluorozirconate) glass was done to study feasibility of sensitizing Tm:ZBLAN with Yb to facilitate development of an efficient, conveniently pumped blue upconversion fiber laser. it was found that, under single-color pumping, 480 nm emission from Tm{sup 3+} was strongest when Yb,Tm:ZBLAN is excited at 975 nm; the strongest blue blue emission was obtained from a glass sample with 2.0 wt% Yb + 0.3 wt% Tm. Also, for weak 975 nm pump intensities, strength of blue upconversion emission can be greatly enhanced by simultaneously pumping at 785 nm. This increased upconversion efficiency is ... continued below

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13 p.

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Carrig, T.J. & Cockroft, N.J. October 1, 1996.

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  • Carrig, T.J. Coherent Technologies, Inc., Lafayette, CO (United States)
  • Cockroft, N.J. Los Alamos National Lab., NM (United States)

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Description

A spectroscopic study of 22 rare-earth-ion doped ZBLAN (fluorozirconate) glass was done to study feasibility of sensitizing Tm:ZBLAN with Yb to facilitate development of an efficient, conveniently pumped blue upconversion fiber laser. it was found that, under single-color pumping, 480 nm emission from Tm{sup 3+} was strongest when Yb,Tm:ZBLAN is excited at 975 nm; the strongest blue blue emission was obtained from a glass sample with 2.0 wt% Yb + 0.3 wt% Tm. Also, for weak 975 nm pump intensities, strength of blue upconversion emission can be greatly enhanced by simultaneously pumping at 785 nm. This increased upconversion efficiency is due to reduced number of energy transfer steps needed to populate the Tm{sup 3+} {sup 1}G{sub 4} energy level. Measurements of fluorescence lifetimes vs dopant concentration were also made for Yb{sup 3+}, Tm{sup 3+}, and Pr{sup 3+} transitions in ZBLAN in order to better characterize concentration quenching effects. Energy transfer between Tm{sup 3+} and Pr{sup 3+} in ZBLAN is also described.

Physical Description

13 p.

Notes

OSTI as DE96014653

Source

  • Denver `96: 1. conference on space processing of materials, at SPIE International Society for Optical Engineering (SPIE) annual international symposium on optical science, engineering, and instrumentation, Denver, CO (United States), 4-9 Aug 1996

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  • Other: DE96014653
  • Report No.: LA-UR--96-2779
  • Report No.: CONF-960848--14
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 389082
  • Archival Resource Key: ark:/67531/metadc685746

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  • October 1, 1996

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  • July 25, 2015, 2:20 a.m.

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  • Feb. 26, 2016, 9:34 p.m.

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Carrig, T.J. & Cockroft, N.J. Upconversion processes in Yb-sensitized Tm:ZBLAN, article, October 1, 1996; New Mexico. (digital.library.unt.edu/ark:/67531/metadc685746/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.