High-contrast integral field spectrograph (HCIFS): multi-spectral wavefront control and reduced-dimensional system identification

Sun, He; Goun, Alexei; Redmond, Susan; Galvin, Michael; Groff, Tyler D.; Rizzo, Maxime; Kasdin, N. Jeremy

doi:10.1364/oe.397070

Cited by 6 publications

(2 citation statements)

References 36 publications

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“…Instead of only two channels, as in the DBI mode, the SM-SCC can also use more channels when it is combined with an integral field unit (IFU). Most, if not all, direct imaging instruments contain an IFU for spectral characterization (Groff et al 2015;Beuzit et al 2019;Sun et al 2020). Therefore, it is interesting to extend the SM-SCC to multiple channels.…”

Section: Extending the Sm-scc To Many Spectral Channelsmentioning

confidence: 99%

The spectrally modulated self-coherent camera (SM-SCC): Increasing throughput for focal-plane wavefront sensing

Haffert

2022

A&A

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Context. The detection and characterization of Earth-like exoplanets is one of the major science drivers for the next generation of telescopes. Direct imaging of the planets will play a major role in observations. Current direct imaging instruments are limited by evolving non-common path aberrations (NCPAs). The NCPAs have to be compensated for by using the science focal-plane image. A promising sensor is the self-coherent camera (SCC). An SCC adds a pinhole to the Lyot stop in the coronagraph to introduce a probe electric field. The pinhole has to be separated by at least 1.5 times the pupil size to separate the NCPA speckles from the probe electric field. However, such a distance lets through very little light, which makes it difficult to use an SCC at high speed or on faint targets. Aims. A spectrally modulated self-coherent camera (SM-SCC) is proposed as a solution to the throughput problem. The SM-SCC uses a pinhole with a spectral filter and a dichroic beam splitter, which creates images with and without the probe electric field. This allows the pinhole to be placed closer to the pupil edge and increases the throughput. Combining the SM-SCC with an integral field unit (IFU) can be used to apply more complex modulation patterns to the pinhole and the Lyot stop. A modulation scheme with at least three spectral channels can be used to change the pinhole to an arbitrary aperture with higher throughput. This adds an additional degree of freedom in the design of the SM-SCC. Methods. The performance of the SM-SCC is investigated analytically and through numerical simulations.Results. Numerical simulations show that the SM-SCC increases the pinhole throughput by a factor of 32, which increases the wavefront sensor sensitivity by a factor of 5.7. The reconstruction quality of the sensor is tested by varying the central wavelength of the spectral channels. A smaller separation between the wavelength channels leads to better results. The SM-SCC reaches a contrast of 1•10 −9 for bright targets in closed-loop control with the presence of photon noise, phase errors, and amplitude errors. The contrast floor on fainter targets is photon-noise-limited and reaches 1 • 10 −7 . The SM-SCC with an IFU can handle randomly generated reference field apertures. For bright targets, the SM-SCC-IFU reaches a contrast of 3 • 10 −9 in closed-loop control with photon noise, amplitude errors, and phase errors. Conclusions. The SM-SCC is a promising focal-plane wavefront sensor for systems that use multiband observations, either through integral field spectroscopy or dual-band imaging.

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Section: Extending the Sm-scc To Many Spectral Channelsmentioning

confidence: 99%

The spectrally modulated self-coherent camera (SM-SCC): Increasing throughput for focal-plane wavefront sensing

Haffert

2022

A&A

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“…11 In order to suppress the starlight within a certain band, an estimate of the electric field over the band must be obtained which can then be used to determine a DM command to reduce the light in the dark zone. There are currently two accepted approaches to estimate the electric field within a broadband dark zone: (1) use an integral field spectrometer (IFS) 12 and (2) use multiple narrowband filters. 13 For both the IFS and narrowband filter approaches, any of the monochromatic electric field estimators developed, such as pairwise-probing or Kalman filters, 14 can be used.…”

Section: Direct Observation and Spectroscopy Of Exoplanets With A Spa...mentioning

confidence: 99%

Implementation of a broadband focal plane estimator for high-contrast dark zones

Redmond¹,

Pueyo²,

Pogorelyuk³

et al. 2021

Preprint

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The characterization of exoplanet atmospheres using direct imaging spectroscopy requires high-contrast over a wide wavelength range. We study a recently proposed focal plane wavefront estimation algorithm that exclusively uses broadband images to estimate the electric field. This approach therefore reduces the complexity and observational overheads compared to traditional single wavelength approaches. The electric field is estimated as an incoherent sum of monochromatic intensities with the pair-wise probing technique. This paper covers the detailed implementation of the algorithm and an application to the High-contrast Imager for Complex Aperture Telescopes (HiCAT) testbed with the goal to compare the performance between the broadband and traditional narrowband filter approaches.

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Implementation of a broadband focal plane estimator for high-contrast dark zones

Redmond¹,

Pueyo

Pogorelyuk

et al. 2021

Techniques and Instrumentation for Detection of Exoplanets X

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High-contrast integral field spectrograph (HCIFS): multi-spectral wavefront control and reduced-dimensional system identification

Cited by 6 publications

References 36 publications

The spectrally modulated self-coherent camera (SM-SCC): Increasing throughput for focal-plane wavefront sensing

The spectrally modulated self-coherent camera (SM-SCC): Increasing throughput for focal-plane wavefront sensing

Implementation of a broadband focal plane estimator for high-contrast dark zones

Implementation of a broadband focal plane estimator for high-contrast dark zones

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