Stabilising a nulling interferometer using optical path difference dithering
Pavel Gabor,Bruno Chazelas,Frank Brachet,Marc Ollivier,Michel Decaudin,Sophie Jacquinod,Alain Labèque,Alain Léger +7 more
TL;DR: In this paper, a modified version of the classical dithering technique was applied to the optical path difference in the scientific beam to remove the 1/f component of the noise in the setup for periods of 10 min, typically.
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Abstract: Context. Nulling interferometry has been suggested as the underlying principle for the Darwin and TPF-I exoplanet research missions. Aims. There are constraints both on the mean value of the nulling ratio, and on its stability. Instrument instability noise is most detrimental to the stability of the nulling performance. Methods. We applied a modified version of the classical dithering technique to the optical path difference in the scientific beam. Results. Using only this method, we repeatedly stabilised the dark fringe for several hours. This method alone sufficed to remove the 1/f component of the noise in our setup for periods of 10 min, typically. These results indicate that performance stability may be maintained throughout the long-duration data acquisitions typical of exoplanet spectroscopy. Conclusions. We suggest that further study of possible stabilisation strategies should be an integral part of Darwin/TPF-I research and development.
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Citations
Electro-optic fringe locking and photometric tuning using a two-stage Mach-Zehnder lithium niobate waveguide for high-contrast mid-infrared interferometry
TL;DR: In this paper, a two-stage Mach-Zehnder interferometer waveguide was used to balance the photometric flux by locking the dark fringe and monitoring its intensity, which achieved a rejection ratio of 4600 (36.6 dB) at 3.39 μm in transverse electric polarization.
30
Toward a large bandwidth photonic correlator for infrared heterodyne interferometry. A first laboratory proof of concept
TL;DR: In this article, a photonic double-sideband correlator was proposed to address the problem of transport and correlation of wide-bandwidth signals over kilometric distances by introducing photonic processing in infrared heterodyne interferometry.
The NULLTIMATE test bench: achromatic phase shifters for nulling interferometry
Peter A. Schuller,Olivier Demangeon,Alain Léger,Marc Barillot,Bruno Chazelas,Michel Decaudin,Marc Derrien,Philippe Duret,Pavel Gabor,Grégory Gadret,Alain Labèque,Ralf Launhardt,Jacques Mangin,Yves Rabbia,Zoran Sodnik +14 more
TL;DR: The NULLTIMATE project developed and realized three concepts of achromatic phase shifters for nulling interferometry as discussed by the authors, one of which is based on dispersive plates made of three materials which where fully characterized regarding their refractive index and thermo-optic behavior between 100K and 330 K.
6
Stabilising a nulling interferometer using optical path difference dithering: an update
Pavel Gabor,Bruno Chazelas,P. A. Schuller,Frank Brachet,Marc Ollivier,Michel Decaudin,Alain Labèque,Philippe Duret,Sophie Jacquinod,Alain Léger +9 more
TL;DR: In this paper, the potential of optical path difference stabilisation with dithering methods for improving the mean nulling ratio and its stability is discussed, and the basic dithering algorithm, its refined versions and parameter tuning are reviewed.
5
Toward a large bandwidth photonic correlator for infrared heterodyne interferometry
TL;DR: In this article, a photonic double-sideband correlator for two telescopes was proposed, along with the experimental demonstration of this concept on a proof-of-principle test bed.
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