The GeS2-Ga2S3 vitreous matrix can incorporate metal halides in its network allowing the properties of the glasses to be adjusted following the composition. In this work, different systems containing either CsCl, CsI, CdCl2, or CdI2 are investigated in order to determine the compositions having the most suitable properties for drawing a step-index fibre. Indeed, transition glass temperatures and optical parameters such as the optical band-gap, the linear and nonlinear refractive indexes are given. The preforms were prepared using the rod-in-tube technique and multimode step-index fibres were successfully drawn. This initial work led from these glass families, which also show both the possibility to be rare-earth doped and to be permanently photo-written by a femtosecond laser, paves the way to a future mid-IR laser fibre.

中文翻译：

---

来自金属卤化物硫属化物玻璃的阶跃折射率光纤

GeS2-Ga2S3 玻璃质基质可以在其网络中加入金属卤化物，从而可以根据成分调整玻璃的特性。在这项工作中，研究了含有 CsCl、CsI、CdCl2 或 CdI2 的不同系统，以确定最适合拉伸阶跃折射率光纤的成分。实际上，给出了过渡玻璃温度和光学参数，例如光学带隙、线性和非线性折射率。预制棒是使用管中棒技术制备的，并且成功地拉制了多模阶跃折射率光纤。这项最初的工作来自这些玻璃家族，它们也显示了稀土掺杂的可能性和由飞秒激光永久写成的可能性，为未来的中红外激光光纤铺平了道路。