Published March 4, 2021 | Version v1
Journal article Open

Direct-laser-written integrated mid-IR directional couplers in a BGG glass

  • 1. 1Centre d'Optique, Photonique et Laser (COPL); Université de Bordeaux, CNRS, CEA, CELIA, UMR 5107
  • 2. Université de Bordeaux, CNRS, CEA, CELIA, UMR 5107; 3Université de Bordeaux, CNRS, ICMCB, UMR 5026
  • 3. 1Centre d'Optique, Photonique et Laser (COPL)
  • 4. 1Centre d'Optique, Photonique et Laser (COPL); Université de Bordeaux, CNRS, CEA, CELIA, UMR 5107; 4Universit e Côte d'Azur, CNRS, INPHYNI
  • 5. Université de Bordeaux, CNRS, CEA, CELIA, UMR 5107

Description

The development of coherent sources and other optical components for the mid-infrared has been hampered by the lack of sturdy materials that can withstand high power radiation or exposition to harsh environment. BGG glasses are robust materials transmitting over the 2.5–5 μm region. We report here the direct femtosecond laser fabrication of efficient directional couplers integrated in a BGG glass chip. The photonic components are characterized from 2.1 to 4.2 μm and compared to similar structures inscribed in silica glass samples. At 2.85 μm, a 99% relative cross transmission is reported in BGG glass. The experimental measurements are in good agreement with the coupled mode theory for wavelengths up to 3.5 μm.

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Additional details

Related works

Is supplemented by
10.5281/zenodo.6330538 (DOI)

Funding

FUNGLASS – FUNctional GLASS 823941
European Commission