Broadband phase and intensity compensation with a deformable mirror for an interferometric nuller.

Applied optics

PubMedID: 18641762

Peters RD, Lay OP, Jeganathan M. Broadband phase and intensity compensation with a deformable mirror for an interferometric nuller. Appl Opt. 2008;47(21):3920-6.
Nulling interferometry has been proposed for the direct detection of Earth-like planets. Deep stable nulls require careful control of the relative intensity and phase of the beams that are being combined. We present a novel compensator, the Adaptive Nuller, that corrects the intensity and phase as a function of wavelength from 8 to 12 microm using a deformable mirror. This compensator has been used to produce rejection ratios of 82,000:1 over a bandwidth of 3.2 microm centered around 10 microm.