Supercontinuum generation in non-silica fibers
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- 作者：Jonathan H.V. Price ; Xian Feng ; Alex ; er M. Heidt ; Gilberto Brambilla ; Peter Horak ; Francesco Poletti ; Giorgio Ponzo ; Periklis Petropoulos ; Marco Petrovich ; Jindan Shi ; Morten Ibsen ; Wei H. Loh ; Harvey N. Rutt ; David J. Richardson
- 关键词：Soft glass ; Non-silica glass ; Microstructured fiber (MOF) ; Tellurite ; Supercontinuum ; Mid-infrared (mid-IR)
- 刊名：Optical Fiber Technology
- 出版年：2012
- 出版时间：September, 2012
- 年：2012
- 卷：18
- 期：5
- 页码：327-344
- 全文大小：1957 K
文摘
The development of super continuum sources is driven by the requirements of a wide range of emerging applications. This paper points out how non-silica fibers are of benefit not only because their broad mid-IR transparency enables continuum generation in the 2-5 ¦Ìm region but also since the high intrinsic nonlinearity of the glasses reduces the power-threshold for devices at wavelengths below 2 ¦Ìm. For these glasses, the material zero-dispersion wavelength is typically shifted to long wavelengths compared to silica so dispersion tailoring is key to creating sources based on practical, near-IR, solid state pump lasers. We show how modeling work has produced fiber designs that provide flattened dispersion profiles with high nonlinearity coefficients and zero-dispersion wavelengths in the near-IR. Building on this flexibility, modeling of the pulse dynamics then demonstrates how coherent mid-IR supercontinuum sources could be developed. We also show the importance of the second zero-dispersion wavelength using bismuth fibers as an example. Nonlinear mode-coupling is shown to be a factor in larger core fibers for high-power applications. Demonstrations of supercontinuum in microstructured tellurite fibers, all-solid lead-silicate (SF57) fibers and in bismuth fibers and tapers are then reported to show what has been achieved experimentally using a range of materials and fiber geometries.