Geometric-optical reconstruction of femtosecond hologram in planar optical waveguide

A. M. Smolovich; E. Alvarez; S. A. Aseyev; M. A. Cervantes; S. V. Chekalin; A. V. Irzhak; O. B. Serov; V. S. Terpugov

doi:10.1117/12.751896

28 June 2007 Geometric-optical reconstruction of femtosecond hologram in planar optical waveguide

A. M. Smolovich, E. Alvarez, S. A. Aseyev, M. A. Cervantes, S. V. Chekalin, A. V. Irzhak, O. B. Serov, V. S. Terpugov

Proceedings Volume 6732, International Conference on Lasers, Applications, and Technologies 2007: Laser-assisted Micro- and Nanotechnologies; 67320D (2007) https://doi.org/10.1117/12.751896
Event: International Conference on Lasers, Applications, and Technologies '07, 2007, Minsk, Belarus

Abstract

The geometric-optical mechanism of wavefront reconstruction differs significantly from conventional holographic reconstruction. This regime can be realized for holograms containing only few periods of interference fringe structure. The geometric-optical reconstruction of the holograms recorded by femtosecond laser pulses in volume media was demonstrated in our previous works. The large thickness of the recording medium required for the effect observation is a serious obstacle for future development in this direction. In this work a way to surmount this obstacle by realizing the waveguide analog of the geometric-optical reconstruction process is presented. Holograms were recorded by 30-femtosecond laser pulses in 20-μm film of dichromated gelatin on the polished quartz substrate and reconstructed by the waveguide mode. Geometric-optical regime of waveguide hologram reconstruction was obtained: the direction of the reconstructed beam was observed to be constant as the reconstructing wavelength was varied within the hologram spectral selectivity band. The possibility of producing achromatic waveguide optical elements containing only few periods is discussed. The utilization of FIB (focused ion beam) nanotechnology for fabrication of these optical elements is proposed. Production of high aspect ratio periodic structures by FIB technology is demonstrated.

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A. M. Smolovich, E. Alvarez, S. A. Aseyev, M. A. Cervantes, S. V. Chekalin, A. V. Irzhak, O. B. Serov, and V. S. Terpugov "Geometric-optical reconstruction of femtosecond hologram in planar optical waveguide", Proc. SPIE 6732, International Conference on Lasers, Applications, and Technologies 2007: Laser-assisted Micro- and Nanotechnologies, 67320D (28 June 2007); https://doi.org/10.1117/12.751896

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KEYWORDS

Holograms

Waveguides

Femtosecond phenomena

Optical components

Planar waveguides

Mirrors

Volume holography

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