Modern collinear LiNbO3 acousto-optical filter for optical spectroscopy: the exploration of efficiency and spectral resolution

A. S. Shcherbakov; A. O. Arellanes; E. Bertone

doi:10.1117/12.2229713

24 February 2016 Modern collinear LiNbO₃ acousto-optical filter for optical spectroscopy: the exploration of efficiency and spectral resolution

A. S. Shcherbakov, A. O. Arellanes, E. Bertone

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Proceedings Volume 9744, Optical Components and Materials XIII; 97441M (2016) https://doi.org/10.1117/12.2229713
Event: SPIE OPTO, 2016, San Francisco, California, United States

Abstract

Our work is devoted to the collinear acousto-optical filter governed by the acoustic waves of finite amplitude. It represents a novel bulk-optical component, namely, the dispersive element for optical spectroscopy. This filter is based on specifically doped lithium niobate single crystal that unexpectedly works in the near ultraviolet range as well as this material usually works in the visible range. We examine the phenomena affecting the filter transmission efficiency and its resolution, i.e. the light-induced absorption and photorefraction. A new nonlinear approach is used to characterize performances of this collinear LiNbO3 acousto-optical filter exploiting our revealed specific acousto-optical nonlinearity. We have carried out the experiments with the collinear filter based on the congruent LiNbO₃ crystal of 6.3 cm length at λ = 405 and 440 nm to verify our analysis and estimations. We also explore an opportunity to trade an amount of the efficiency to improve the spectral resolution. The transmission efficiency steeply increases with increasing light wavelength and with decreasing length of the filter, nevertheless the efficiency still remains higher than 30% in the near ultraviolet, if the spectral resolution is limited by δλ = 0.28–0.29 Å. Moreover, we demonstrate the possibility to reach a resolution as high as δλ = 0.12–0.15 Å (R > 24600), preserving at the same time an efficiency higher than 10% over the spectral interval that we considered. It looks like our filter holds the best to our knowledge experimentally confirmed spectral resolution for any collinear acousto-optical spectrometers dedicated to space/airborne operations.

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A. S. Shcherbakov, A. O. Arellanes, and E. Bertone "Modern collinear LiNbO₃ acousto-optical filter for optical spectroscopy: the exploration of efficiency and spectral resolution", Proc. SPIE 9744, Optical Components and Materials XIII, 97441M (24 February 2016); https://doi.org/10.1117/12.2229713

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KEYWORDS

Spectral resolution

Photorefraction

Birefringence

Absorption

Magnesium

Near ultraviolet

Optical filters

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