Up-conversion processes in Yb-sensitized Tm:ZBLAN

Timothy J. Carrig; Nigel J. Cockroft

doi:10.1117/12.258977

20 November 1996 Up-conversion processes in Yb-sensitized Tm:ZBLAN

Timothy J. Carrig, Nigel J. Cockroft

Proceedings Volume 2841, Doped Fiber Devices; (1996) https://doi.org/10.1117/12.258977
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

Abstract

A systematic spectroscopic study of 22 rate-earth-ion doped ZBLAN glass samples was conducted to investigate the feasibility of sensitizing Tm:ZBLAN with Yb to facilitate the development of an efficient and conveniently pumped blue upconversion fiber laser. It was determined that, under conditions of single-color pumping, 480 nm emission from Tm³⁺ is strongest when Yb, Tm:ZBLAN is excited at a wavelength of approximately 975 nm. In this case, the strongest blue emission was obtained from a ZBLAN glass sample with a nominal dopant concentration of approximately 2.0 wt percent Yb + 0.3 wt percent Tm. Additionally, it was demonstrated that for weak 975 nm pump intensities, the strength of the blue upconversion emission can be greatly enhanced by simultaneously pumping at approximately 785 nm. This increase in upconversion efficiency is due to a reduction in the number of energy transfer steps needed to populate the Tm³⁺ ¹G₄ energy level. Measurements of fluorescence lifetimes as a function of dopant concentration wee also made for Yb³⁺, and Pr³⁺ transitions in ZBLAN in order to better characterize concentration quenching effects. Energy transfer between Tm³⁺ and Pr³⁺ in ZBLAN is also described.

Citation Download Citation

Timothy J. Carrig and Nigel J. Cockroft "Up-conversion processes in Yb-sensitized Tm:ZBLAN", Proc. SPIE 2841, Doped Fiber Devices, (20 November 1996); https://doi.org/10.1117/12.258977

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