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Femtosecond-written volume Bragg gratings in fluoride glasses

: Talbot, L.; Richter, D.; Heck, M.; Nolte, S.; Bernier, M.


Optics Letters 45 (2020), Nr.13, S.3625-3628
ISSN: 0146-9592
ISSN: 1539-4794
Fraunhofer IOF ()

We report on what we believe are the first volume Bragg gratings written inside bulk multicomponent fluoride glasses. The gratings inscribed with tightly focused infrared (IR)-femtosecond pulses in combination with the phase-mask technique exhibit refractive index modulations of up to 5×10−4 with reflectivities up to 90% at a wavelength near 2.8 µm. Such highly compact and narrowband filters could have a significant impact on numerous high-end applications from the UV to the mid-IR.