Achromatic phase-shifter breadboard extensions

L. L. A. Vosteen; H. J. P. Vink; H. van Brug; H. Bokhove

doi:10.1117/12.614337

14 September 2005 Achromatic phase-shifter breadboard extensions

L. L. A. Vosteen, H. J. P. Vink, H. van Brug, H. Bokhove

Proceedings Volume 5905, Techniques and Instrumentation for Detection of Exoplanets II; 59050A (2005) https://doi.org/10.1117/12.614337
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

Abstract

The Achromatic Phase shifter breadboard (APS) is designed for broadband (550-750 nm) nulling. This system has already been described in detail previously^1,2, this paper describes improvements to the breadboard currently implemented and the corresponding results obtained. The breadboard improvements concern the following four points: A) Residual vibrations are compensated by active OPD control; B) Beam overlap can be optimized by an extra alignment mechanism; C) A more versatile detector/preamplifier is used; D) Adjustments of the phase shifter are now computer controlled. The paper describes the set-up and the results of these improvements on the nulling performance of the breadboard with the goal to achieve a 10⁴ nulling ratio and to validate the computer simulations of the achromatic phase shifter. The validated value for nuldepth observed is currently 4600+/-400, and ratio's above 10,000 have been found, when measuring with a higher bandwidth. Nulldepths like these have to our knowledge not been reported before for relative spectral bandwidths of this magnitude. The program continues to optimize the setup and improve the results.

Citation Download Citation

L. L. A. Vosteen, H. J. P. Vink, H. van Brug, and H. Bokhove "Achromatic phase-shifter breadboard extensions", Proc. SPIE 5905, Techniques and Instrumentation for Detection of Exoplanets II, 59050A (14 September 2005); https://doi.org/10.1117/12.614337

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