~2.1 um Tm[sup]3+[/sup]-Ho[sup]3+[/sup] co-doped tungsten tellurite single mode fiber laser

Kefeng Li; Guang Zhang; Lili Hu; Meng Wang; Danping Chen

doi:10.1117/12.907159

19 March 2012 ~2.1 um Tm³⁺-Ho³⁺ co-doped tungsten tellurite single mode fiber laser

Kefeng Li, Guang Zhang, Lili Hu, Meng Wang, Danping Chen

Proceedings Volume 8257, Optical Components and Materials IX; 82570A (2012) https://doi.org/10.1117/12.907159
Event: SPIE OPTO, 2012, San Francisco, California, United States

Abstract

We investigate the spectroscopic and lasing performance of Tm³⁺-Ho³⁺ co-doped tungsten tellurite single mode fiber operating around 2.1 μm with a commercial 800 nm diode laser pump source. The optimum doping concentration of Tm₂O₃ and Ho₂O₃ in Tm³⁺-Ho³⁺ co-doped TeO₂-WO₃-La₂O₃ (TWL) glass is 1 mol% and 0.5 mol%, respectively. The lifetime of Ho³⁺:⁵I₇ level is 3.3 ms in the bulk glass. The maximum stimulated emission cross-section of Ho³⁺ in TWL is 10.0×10^-21cm². The tungsten tellurite single mode fibers are prepared by using rod-in-tube method. The infrared emission spectra are compared with varying fiber lengths. Tm³⁺-Ho³⁺ co-doped fiber shows weak emission at ~1.9 μm very strong emission at ~2.1 μm, which indicates efficient energy transfer from Tm³⁺ to Ho³⁺ in the fiber. The 1.47 μm emission increases with the increment of the fiber length, which means a back energy transfer from Ho³⁺ to Tm³⁺. A 106 mW continuous wave laser emission at ~2.1 μm is demonstrated from a 16 cm length of this fiber, the slope efficiency is 23%, corresponding to a 17% optical to optical efficiency. Lasing has also been achieved in <5 cm length of this fiber, making this material a promising candidate for single frequency ~2.1 μm laser sources.

Citation Download Citation

Kefeng Li, Guang Zhang, Lili Hu, Meng Wang, and Danping Chen "~2.1 um Tm³⁺-Ho³⁺ co-doped tungsten tellurite single mode fiber laser", Proc. SPIE 8257, Optical Components and Materials IX, 82570A (19 March 2012); https://doi.org/10.1117/12.907159

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