High-Power $\hbox{Yb}^{{\bm 3}{\bm +}}$-Doped Phosphate Fiber Amplifier
| Autor: | Karel E. Urbanek, Robert L. Byer, Supriyo Sinha, Yin-Wen Lee, M.J.F. Digonnet, Shibin Jiang |
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| Rok vydání: | 2009 |
| Předmět: |
Ytterbium
Multi-mode optical fiber Materials science business.industry Slope efficiency chemistry.chemical_element Laser Atomic and Molecular Physics and Optics law.invention Optics chemistry law Brillouin scattering Fiber laser Photodarkening Optoelectronics Laser beam quality Electrical and Electronic Engineering business |
| Zdroj: | IEEE Journal of Selected Topics in Quantum Electronics. 15:93-102 |
| ISSN: | 1077-260X |
| DOI: | 10.1109/jstqe.2008.2010263 |
| Popis: | We report on the development of novel high-power light sources utilizing a Yb3+-doped phosphate fiber as the gain element. This host presents several key benefits over silica, particularly much higher Yb2 O3 concentrations (up to 26 wt%), a 50% weaker stimulated Brillouin scattering (SBS) gain cross section, and the absence of observable photodarkening even at high population inversion. These properties result in a greatly increased SBS threshold compared to silica fibers, and therefore, potentially much higher output powers out of either a multimode large mode area or a single-mode fiber, which means in the latter case a higher beam quality. To quantify these predictions, we show through numerical simulations that double-clad phosphate fibers should produce as much as ~ 700 W of single-frequency output power in a step index, single-mode core. As a step in this direction, we report a short phosphate fiber amplifier doped with 12 wt% Yb2 O3 that emits 16 W of single-frequency single-mode output. We also describe a single-mode phosphate fiber laser with a maximum output power of 57 W. The laser slope efficiency is currently limited by the fairly high fiber loss ( ~ 3 dB/m). Measurements indicate that 77% of this loss originates from impurity absorption, and the rest from scattering. |
| Databáze: | OpenAIRE |
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