Nanocrystalline ceramic coatings for the capillary fiber lasers

Ondrej Podrazky; Jan Mrázek; Petr Vařák; Jana Proboštová; Ivo Bartoň; Ivan Kašík

doi:10.1117/12.2665632

30 May 2023 Nanocrystalline ceramic coatings for the capillary fiber lasers

Ondrej Podrazky, Jan Mrázek, Petr Vařák, Jana Proboštová, Ivo Bartoň, Ivan Kašík

Proceedings Volume 12573, Specialty Optical Fibres; 125730X (2023) https://doi.org/10.1117/12.2665632
Event: SPIE Optics + Optoelectronics, 2023, Prague, Czech Republic

Abstract

Nanocrystalline holmium-doped titanates have been widely investigated for their luminescence properties. Low-phonon pyrochlore lattice supports the radiative energy transfers improving the efficiency of high-power lasers and amplifiers operating around 2 m. However, the chemical reactivity toward the silica prevents the incorporation of ceramic nanoparticles in common optical fibers. Deposition of active ceramic layer on the inner wall of capillary or hollow core fiber represents a promising alternative. We present a versatile sol-gel route to active capillary fibers doped by nanocrystalline (Ho0.05La0.95)2Ti2O7. Nanocrystalline films with tailored properties were prepared by sol-gel method. The sols were coated on silica glass slides to receive a set of reference samples and soaked into silica capillary fibers making the coatings on the inner capillary wall. The presented approach led to the formation of homogenous nanocrystalline (Ho0.05La0.95)2Ti2O7 films with tailored nanocrystal size up to 87 nm and refractive index of about 2.2. All prepared samples showed an intensive emission at 2.0 m under an excitation at 450 nm and the luminescence decay time of about 7.3 ms. The presented method enables the preparation of homogenous and highly transparent thin films with tailored properties. These films are suitable for preparation of bulk luminophores and planar active optical components operating at 2 μm.

Citation Download Citation

Ondrej Podrazky, Jan Mrázek, Petr Vařák, Jana Proboštová, Ivo Bartoň, and Ivan Kašík "Nanocrystalline ceramic coatings for the capillary fiber lasers", Proc. SPIE 12573, Specialty Optical Fibres, 125730X (30 May 2023); https://doi.org/10.1117/12.2665632

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KEYWORDS

Capillaries

Luminescence

Nanocrystals

Holmium

Silica

Thin films

Fiber lasers

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