Expanding sampling in a SWIFTS-Lippmann spectrometer using an electro-optic Mach-Zehnder modulator

Fabrice Thomas; Samuel Heidmann; Joran Loridat; Mikhaël de Mengin; Alain Morand; Pierre Benech; Christophe Bonneville; Thierry Gonthiez; Etienne P. Le Coarer; Guillermo Martin

doi:10.1117/12.2178972

1 May 2015 Expanding sampling in a SWIFTS-Lippmann spectrometer using an electro-optic Mach-Zehnder modulator

Fabrice Thomas, Samuel Heidmann, Joran Loridat, Mikhaël de Mengin, Alain Morand, Pierre Benech, Christophe Bonneville, Thierry Gonthiez, Etienne P. Le Coarer, Guillermo Martin

Author Affiliations +

Proceedings Volume 9516, Integrated Optics: Physics and Simulations II; 95160B (2015) https://doi.org/10.1117/12.2178972
Event: SPIE Optics + Optoelectronics, 2015, Prague, Czech Republic

Abstract

In this work, we propose an alternative to the sub-sampling limitation in the single-waveguide configuration of SWIFTS technology using the electro-optical properties of Lithium Niobate (LiNbO₃) technology. A Mach-Zehnder intensity modulator, with an initial imbalance between the arms, is coupled with a linear SWIFTS-Lippmann spectrometer. With quite reasonable control voltages (<100V), "dynamic" wide band fringes (generated by the unbalanced interferometer) can be moved under the nanodots to compensate the sub-sampling related to their spacing and rebuild the interferogram with a good sampling in a very short time, thanks to the electro-optical performances of Lithium Niobate technology. We present the measurements of broadband sources' interferograms sampled by this setup, and the considerations for spectral reconstructions for a SLED source at λ = 850 nm. The study leads to a better understanding of the behavior of the spectrometer with model and local measurement of the cross-talk phenomenon between nanodots and pixels, photometries and efficiencies of diffusion. This work opens the way to electro-optic devices where external optical path delay scan could be replaced by internal phase-modulation using electro-optic effect.

Citation Download Citation

Fabrice Thomas, Samuel Heidmann, Joran Loridat, Mikhaël de Mengin, Alain Morand, Pierre Benech, Christophe Bonneville, Thierry Gonthiez, Etienne P. Le Coarer, and Guillermo Martin "Expanding sampling in a SWIFTS-Lippmann spectrometer using an electro-optic Mach-Zehnder modulator", Proc. SPIE 9516, Integrated Optics: Physics and Simulations II, 95160B (1 May 2015); https://doi.org/10.1117/12.2178972

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