Buried channel waveguides in Yb-doped KY(WO4)2 crystals fabricated by femtosecond laser irradiation

C.N. Borca, V. Apostolopoulos, F. Gardillou, H.G. Limberger, Markus Pollnau, R.P. Salathé

    Research output: Contribution to journalArticleAcademicpeer-review

    21 Citations (Scopus)

    Abstract

    We report on the fabrication of optical channel waveguides inside $KY{(WO_4)}_2$ crystals, both undoped and Yb-doped, for applications in compact solid-state lasers and three-dimensional photonic devices. Nonlinear absorption of femtosecond laser pulses has been employed in order to induce refractive-index changes in these crystals. The irradiation damage results in a decrease of the material density compared to the surrounding bulk. In this work, two types of buried channel waveguides have been fabricated in the $KY{(WO_4)}_2$ crystals. First ones (type I) were formed in the vicinity of the irradiated regions due to the presence of an induced compressive lattice strain, which causes an increase of the local refractive index. Light can be better confined in the second (type II) of channel waveguides that are created between pairs of damaged regions. For the best confined channels (type II), the propagation loss value measured at 1 mm amounted to 2–2.5 dB/cm.
    Original languageUndefined
    Article number10.1016/j.apsusc.2007.02.106
    Pages (from-to)8300-8303
    Number of pages4
    JournalApplied surface science
    Volume253
    Issue numberLNCS4549/19
    DOIs
    Publication statusPublished - 31 Jul 2007

    Keywords

    • EWI-11126
    • IR-61938
    • METIS-241938
    • IOMS-APD: Active Photonic Devices

    Cite this

    Borca, C. N., Apostolopoulos, V., Gardillou, F., Limberger, H. G., Pollnau, M., & Salathé, R. P. (2007). Buried channel waveguides in Yb-doped KY(WO4)2 crystals fabricated by femtosecond laser irradiation. Applied surface science, 253(LNCS4549/19), 8300-8303. [10.1016/j.apsusc.2007.02.106]. https://doi.org/10.1016/j.apsusc.2007.02.106
    Borca, C.N. ; Apostolopoulos, V. ; Gardillou, F. ; Limberger, H.G. ; Pollnau, Markus ; Salathé, R.P. / Buried channel waveguides in Yb-doped KY(WO4)2 crystals fabricated by femtosecond laser irradiation. In: Applied surface science. 2007 ; Vol. 253, No. LNCS4549/19. pp. 8300-8303.
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    abstract = "We report on the fabrication of optical channel waveguides inside $KY{(WO_4)}_2$ crystals, both undoped and Yb-doped, for applications in compact solid-state lasers and three-dimensional photonic devices. Nonlinear absorption of femtosecond laser pulses has been employed in order to induce refractive-index changes in these crystals. The irradiation damage results in a decrease of the material density compared to the surrounding bulk. In this work, two types of buried channel waveguides have been fabricated in the $KY{(WO_4)}_2$ crystals. First ones (type I) were formed in the vicinity of the irradiated regions due to the presence of an induced compressive lattice strain, which causes an increase of the local refractive index. Light can be better confined in the second (type II) of channel waveguides that are created between pairs of damaged regions. For the best confined channels (type II), the propagation loss value measured at 1 mm amounted to 2–2.5 dB/cm.",
    keywords = "EWI-11126, IR-61938, METIS-241938, IOMS-APD: Active Photonic Devices",
    author = "C.N. Borca and V. Apostolopoulos and F. Gardillou and H.G. Limberger and Markus Pollnau and R.P. Salath{\'e}",
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    Borca, CN, Apostolopoulos, V, Gardillou, F, Limberger, HG, Pollnau, M & Salathé, RP 2007, 'Buried channel waveguides in Yb-doped KY(WO4)2 crystals fabricated by femtosecond laser irradiation', Applied surface science, vol. 253, no. LNCS4549/19, 10.1016/j.apsusc.2007.02.106, pp. 8300-8303. https://doi.org/10.1016/j.apsusc.2007.02.106

    Buried channel waveguides in Yb-doped KY(WO4)2 crystals fabricated by femtosecond laser irradiation. / Borca, C.N.; Apostolopoulos, V.; Gardillou, F.; Limberger, H.G.; Pollnau, Markus; Salathé, R.P.

    In: Applied surface science, Vol. 253, No. LNCS4549/19, 10.1016/j.apsusc.2007.02.106, 31.07.2007, p. 8300-8303.

    Research output: Contribution to journalArticleAcademicpeer-review

    TY - JOUR

    T1 - Buried channel waveguides in Yb-doped KY(WO4)2 crystals fabricated by femtosecond laser irradiation

    AU - Borca, C.N.

    AU - Apostolopoulos, V.

    AU - Gardillou, F.

    AU - Limberger, H.G.

    AU - Pollnau, Markus

    AU - Salathé, R.P.

    N1 - 10.1016/j.apsusc.2007.02.106

    PY - 2007/7/31

    Y1 - 2007/7/31

    N2 - We report on the fabrication of optical channel waveguides inside $KY{(WO_4)}_2$ crystals, both undoped and Yb-doped, for applications in compact solid-state lasers and three-dimensional photonic devices. Nonlinear absorption of femtosecond laser pulses has been employed in order to induce refractive-index changes in these crystals. The irradiation damage results in a decrease of the material density compared to the surrounding bulk. In this work, two types of buried channel waveguides have been fabricated in the $KY{(WO_4)}_2$ crystals. First ones (type I) were formed in the vicinity of the irradiated regions due to the presence of an induced compressive lattice strain, which causes an increase of the local refractive index. Light can be better confined in the second (type II) of channel waveguides that are created between pairs of damaged regions. For the best confined channels (type II), the propagation loss value measured at 1 mm amounted to 2–2.5 dB/cm.

    AB - We report on the fabrication of optical channel waveguides inside $KY{(WO_4)}_2$ crystals, both undoped and Yb-doped, for applications in compact solid-state lasers and three-dimensional photonic devices. Nonlinear absorption of femtosecond laser pulses has been employed in order to induce refractive-index changes in these crystals. The irradiation damage results in a decrease of the material density compared to the surrounding bulk. In this work, two types of buried channel waveguides have been fabricated in the $KY{(WO_4)}_2$ crystals. First ones (type I) were formed in the vicinity of the irradiated regions due to the presence of an induced compressive lattice strain, which causes an increase of the local refractive index. Light can be better confined in the second (type II) of channel waveguides that are created between pairs of damaged regions. For the best confined channels (type II), the propagation loss value measured at 1 mm amounted to 2–2.5 dB/cm.

    KW - EWI-11126

    KW - IR-61938

    KW - METIS-241938

    KW - IOMS-APD: Active Photonic Devices

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    M3 - Article

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    SP - 8300

    EP - 8303

    JO - Applied surface science

    JF - Applied surface science

    SN - 0169-4332

    IS - LNCS4549/19

    M1 - 10.1016/j.apsusc.2007.02.106

    ER -

    Borca CN, Apostolopoulos V, Gardillou F, Limberger HG, Pollnau M, Salathé RP. Buried channel waveguides in Yb-doped KY(WO4)2 crystals fabricated by femtosecond laser irradiation. Applied surface science. 2007 Jul 31;253(LNCS4549/19):8300-8303. 10.1016/j.apsusc.2007.02.106. https://doi.org/10.1016/j.apsusc.2007.02.106