Up-conversion processes in Ho3+/Tm3+-codoped LiYF4 crystals

Taiju Tsuboi; Kiyoshi Shimamura

doi:10.1117/12.544470

1 September 2004 Up-conversion processes in Ho³⁺/Tm³⁺-codoped LiYF₄ crystals

Taiju Tsuboi, Kiyoshi Shimamura

Proceedings Volume 5460, Solid State Lasers and Amplifiers; (2004) https://doi.org/10.1117/12.544470
Event: Photonics Europe, 2004, Strasbourg, France

Abstract

Absorption and photoluminescence spectra of Tm³⁺ and Ho³⁺ ions in LiYF₄ crystals have been investigated at various temperatures between 10 and 320 K. The photoluminescence is investigated under excitation with Xe-lamp and laser diode. In addition to blue up-converted emission of Tm³⁺ and Ho³⁺ and green up-converted Ho³⁺ emission, anti-Stokes emission bands are observed at 687 and 703 nm under excitation in the ³H₄ state of Tm³⁺ with 785 nm laser diode. These bands are observed above 200 K, and their intensities increase exponentially with increasing temperature. They are attributed to endothermic Tm³⁺ emission due to the transition to the ³H₆ ground state from the upper ³F₃ state which is thermally populated from the ³H₄ state. Discussion is given on the optical process of green up-converted Ho³⁺ emission which is generated by the 785 nm laser diode excitation.

Citation Download Citation

Taiju Tsuboi and Kiyoshi Shimamura "Up-conversion processes in Ho³⁺/Tm³⁺-codoped LiYF₄ crystals", Proc. SPIE 5460, Solid State Lasers and Amplifiers, (1 September 2004); https://doi.org/10.1117/12.544470

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