Photosensitivity of Infrared Glasses under Femtosecond Laser Direct Writing for mid-IR Applications

Author:

Delullier PierreORCID,Calvez Laurent,Druart Guillaume,De La Barrière Florence,Humbert ChristopheORCID,Poumellec Bertrand,Lancry MatthieuORCID

Abstract

Chalcogenide glasses are increasingly being developed for photonic applications, particularly in the field of mid-infrared optical imaging. In this paper, we study the photosensitivity of one chalcogenide to direct femtosecond laser writing and its possible applications to micro-optics. Particular attention has been paid to the creation of phase changes and related refractive index variations. This chalcogenide glass was compared with two commercial heavy oxide glasses: Schott SF10 and Corning 9754. We observed different types of permanent modifications depending on the writing speed and the laser pulse energy. Index variations were measured at Δn>+0.055 in the chalcogenide glass while maintaining spectral transmission similar to the pristine materials before irradiation. This provides a good candidate to design optical components for infrared application and helps to unlock the potential of the femtosecond laser direct writing technique to implement at high writing speed and high index changes with low optical losses.

Funder

Agence Nationale de la Recherche

Direction Générale de l'Armement

Publisher

MDPI AG

Subject

Fluid Flow and Transfer Processes,Computer Science Applications,Process Chemistry and Technology,General Engineering,Instrumentation,General Materials Science

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