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Optimizing the efficiency of femtosecond-laser-written holograms

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Abstract

Computer-generated binary holograms are written on a polished copper surface using single 800-nm, 120-fs pulses from a 1-kHz-repetition-rate laser system. The hologram efficiency (i.e. the power in the holographic reconstructed image relative to the incoming laser power) is investigated for different laser-structuring parameters. Theoretical diffraction grating efficiencies for a binary amplitude grating show good agreement with the experimental measurements for diameters of the laser-formed holes below the pitch. Modelling based on straightforward geometrical arguments is used to find the optimal hole size. For a coverage (i.e. relative laser-structured area) of ∼43 %, the efficiency reaches ∼10 %, which corresponds to a relative power transferred to one reconstructed image of ∼20 %. The efficiency as a function of pitch (for fixed coverage) is fairly constant from 2 to 6 μm.

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Acknowledgments

This work was supported by The Danish Council for Independent Research | Natural Sciences (FNU).

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Authors and Affiliations

  1. Department of Physics and Astronomy, Aarhus University, DK-8000, Aarhus C, Denmark

    K. J. Wædegaard, H. D. Hansen & P. Balling

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  1. K. J. Wædegaard
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  2. H. D. Hansen
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  3. P. Balling
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Correspondence to P. Balling.

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Wædegaard, K.J., Hansen, H.D. & Balling, P. Optimizing the efficiency of femtosecond-laser-written holograms. Appl. Phys. B 113, 345–349 (2013). https://doi.org/10.1007/s00340-013-5496-0

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  • DOI: https://doi.org/10.1007/s00340-013-5496-0

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