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Composite wavelength tunable wedged interference structures with increased free spectral range

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Abstract

In the present paper, we propose a compact composite wedge interference structure by combining wedges with different geometry. We use interferential wedges with optical thickness from several micrometers to several hundred micrometers and apex angles of the order of tens microradians. The aim of the conducted study is to prove that such a structure exhibits improved optical properties in comparison to a conventional wedge. We have carried out simulations and experiments with a structure built from two wedges. We have shown that, instead of multiple transmission peaks observed for a single interferential wedge, the composite structure provides selection of a single resonance in transmission within the impact area of a large diameter monochromatic beam and enables wavelength tuning when a small diameter multi-wavelength beam is used. The first property ensures analysis of light beams characterized with a wide spectrum. The second feature allows for increase of the wavelegth tuning range at keeping spectrally narrow transmission peak if the structure is formed by a thin and a thick interferential wedges. Two such structures have been realized using a technique which we have developed. The experiments made with this structures show that the produced transmission peak is narrowed spatially and spectrally at the expense of lower transmission which achieves 50–60% of transmission ensured by the used interferential wedges.

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Acknowledgements

This work was supported by National Science Fund of Bulgaria (Ministry of Education and Science), Project DH-08/13, “Holographic imaging, beam shaping and speckle metrology with computer generated holograms”.

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Authors and Affiliations

  1. Optoelectronics and Laser Engineering Department, Technical University – Sofia, Plovdiv Branch, 25 Tsanko Diustabanov Str., 4000, Plovdiv, Bulgaria

    Marin Nenchev & Margarita Deneva

  2. Institute of Optical Materials and Technologies, Bulgarian Academy of Sciences, Acad. G. Bonchev, Bl. 109, 1113, Sofia, Bulgaria

    Elena Stoykova

Authors
  1. Marin Nenchev
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  2. Elena Stoykova
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  3. Margarita Deneva
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Corresponding author

Correspondence to Marin Nenchev.

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This article is part of the Topical Collection on Focus on Optics and Bio-photonics, Photonica 2017.

Guest Edited by Jelena Radovanovic, Aleksandar Krmpot, Marina Lekic, Trevor Benson, Mauro Pereira, Marian Marciniak.

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Nenchev, M., Stoykova, E. & Deneva, M. Composite wavelength tunable wedged interference structures with increased free spectral range. Opt Quant Electron 50, 433 (2018). https://doi.org/10.1007/s11082-018-1668-9

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  • DOI: https://doi.org/10.1007/s11082-018-1668-9

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