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Characterization of channel waveguides in Pr:YLiF4 crystals fabricated by direct femtosecond laser writing

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Abstract

Single tracks and pairs of tracks are written in the volume of Pr-doped LiYF4-crystals using tightly focused femtosecond laser radiation (λ=1045 nm, τ p=400–500 fs, f=0.1–1 MHz). Waveguiding between the tracks is demonstrated and optimized by varying the distance between the tracks and the laser writing conditions. The stress-induced guiding mechanism is explained based on TEM, interference microscopy, near-field and far-field measurements. It is shown that the single-crystalline material is getting poly-crystalline under femtosecond laser irradiation. By measuring the lifetime of the 3P1→3H5 transition and the emission spectrum at excitation with λ=444 nm, no influence on these properties of the guided light is observed. This possibly enables the realization of a channel waveguide laser in the visible spectral range.

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Authors and Affiliations

  1. Lehrstuhl für Lasertechnik LLT, RWTH Aachen University, Steinbachstr. 15, 52074, Aachen, Germany

    D. Beckmann, D. Esser & J. Gottmann

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  1. D. Beckmann
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  2. D. Esser
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  3. J. Gottmann
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Correspondence to D. Beckmann.

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Beckmann, D., Esser, D. & Gottmann, J. Characterization of channel waveguides in Pr:YLiF4 crystals fabricated by direct femtosecond laser writing. Appl. Phys. B 104, 619–624 (2011). https://doi.org/10.1007/s00340-011-4406-6

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  • DOI: https://doi.org/10.1007/s00340-011-4406-6

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