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Buried waveguides in Nd:YLF crystals obtained by femtosecond laser writing under double line approach

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Abstract

In this paper, we present buried waveguides fabricated by fs laser writing in Nd3+ doped YLF crystal under double line approach (Miura et al. in Appl. Phys. Lett. 71:3329–3331, 1997). The waveguides were made by focusing two consecutive optical breakdown tracks (OBT) separated by about 20 μm. To make the optimal OBT, we focused the fs-laser pulses 200 μm below surface at intensities above the OB threshold for the material and controlled the writing speed. The guiding structures were fabricated by using a Chirped Pulse Amplification (CPA) femtosecond (fs) laser system. We chose the optimal writing parameters in order to obtain suitable waveguides, using around 3 μJ energy and writing speed from 15 to 50 μm/s. After optically exploring the waveguides by end-fire coupling, the guiding structures showed good optical performance. Guiding index profiles were retrieved from modal analysis by using BeamProp (RSoft) commercial software. This spatial distribution of the index increment, taking into account a lower refractive barrier on the OBT region plus the compressed region between the tracks, was obtained correctly fitting profiles modes.

Finally, optical spectroscopy measurements were also performed in the waveguides. The results showed that the luminescence properties of Nd3+ ions are preserved in the waveguides compared with the values obtained for bulk.

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Notes

  1. We chose this axis because of the lower absorption for the ordinary propagation.

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Acknowledgements

This work was partially supported by Agencia Nacional de Promoción Científica y Tecnólogica. (Argentina) under project PICT-2575 and CONICET (Argentina) under project PIP 0394 and by “Ministerio de Educación y Ciencia,” Spain (Grant no FIS2009-09522 and Consolider Program SAUUL CSD2007-00013). D.B. wishes to thank Comisión de Investigaciones Científicas (Bs. As., Argentina) for his student fellowship.

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Authors and Affiliations

  1. Centro de Investigaciones Ópticas CONICET La Plata-CIC, Camino Centenario y 506, MB Gonnet (1897), Pcia. Bs. As., Argentina

    D. Biasetti, E. Neyra & G. A. Torchia

  2. CLPU and Servicio Láser de la Universidad de Salamanca, Plaza de la Merced s/n, 35008, Salamanca, Spain

    J. R. Vázquez de Aldana & L. Roso

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  1. D. Biasetti
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  2. E. Neyra
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  3. J. R. Vázquez de Aldana
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  4. L. Roso
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  5. G. A. Torchia
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Correspondence to G. A. Torchia.

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Biasetti, D., Neyra, E., Vázquez de Aldana, J.R. et al. Buried waveguides in Nd:YLF crystals obtained by femtosecond laser writing under double line approach. Appl. Phys. A 110, 595–599 (2013). https://doi.org/10.1007/s00339-012-7133-x

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