Abstract
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.
Highlights
Glasses transmitting both in the visible and in the infrared (IR) region are potential candidates to lead to the generation of IR fibres used in many optical application fields
We focus on the fabrication of the step-index fibre, which could be rare-earth doped and photo-inscribed by femtosecond laser in a close future
The first point requires the presence of gallium (Ga) in the composition of the glass since it facilitates the incorporation of rare-earth ions [24]
Summary
Glasses transmitting both in the visible and in the infrared (IR) region are potential candidates to lead to the generation of IR fibres used in many optical application fields. Active optical functions are expected, especially with the development of mid-IR fibre lasers at wavelengths that do not exist yet [19, 20] even if the luminescence at different wavelengths have been already demonstrated [21, 22] To carry out this ambitious project, it is necessary, firstly, to design step-index fibre in which the core could be rare-earth doped, and secondly to inscribe Bragg mirrors to create a laser cavity [23]. The transparency condition in the visible is solved by using sulphur (S) as chalcogenide element rather than selenium or tellurium from which the synthesized glasses are dark or black This condition is motivated by the necessity of absence of linear absorption at the writing laser wavelength ( 800 nm) during the future inscription of Bragg gratings [25]. The attenuation measurement of the step-index fibre drawn in this study are presented
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