The space coronagraph optical bench (SCoOB): 4. vacuum performance of a high contrast imaging testbed
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| Main Authors: | , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866910503949828096 |
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| author | Van Gorkom, Kyle Douglas, Ewan S Milani, Kian Ashcraft, Jaren N Anche, Ramya M Jenkins, Emory Ingraham, Patrick Haffert, Sebastiaan Kim, Daewook Choi, Heejoo Durney, Olivier |
| author_facet | Van Gorkom, Kyle Douglas, Ewan S Milani, Kian Ashcraft, Jaren N Anche, Ramya M Jenkins, Emory Ingraham, Patrick Haffert, Sebastiaan Kim, Daewook Choi, Heejoo Durney, Olivier |
| contents | The Space Coronagraph Optical Bench (SCoOB) is a high-contrast imaging testbed built to demonstrate starlight suppression techniques at visible wavelengths in a space-like vacuum environment. The testbed is designed to achieve ${<}10^{-8}$ contrast from $3-10λ/D$ in a one-sided dark hole using a liquid crystal vector vortex waveplate and a 952-actuator Kilo-C deformable mirror (DM) from Boston Micromachines (BMC). We have recently expanded the testbed to include a field stop for mitigation of stray/scattered light, a precision-fabricated pinhole in the source simulator, a Minus K passive vibration isolation table for jitter reduction, and a low-noise vacuum-compatible CMOS sensor. We report the latest contrast performance achieved using implicit electric field conjugation (iEFC) at a vacuum of ${\sim}10^{-6}$ Torr and over a range of bandpasses with central wavelengths from 500 to 650nm and bandwidths (BW) from $\ll 1\%$ to 15\%. Our jitter in vacuum is $<3\times10^{-3} λ/D$, and the best contrast performance to-date in a half-sided D-shaped dark hole is $2.2\times10^{-9}$ in a $\ll 1 \%$ BW, $4\times10^{-9}$ in a 2\% BW, and $2.5\times10^{-8}$ in a 15\% BW. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2406_18885 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The space coronagraph optical bench (SCoOB): 4. vacuum performance of a high contrast imaging testbed Van Gorkom, Kyle Douglas, Ewan S Milani, Kian Ashcraft, Jaren N Anche, Ramya M Jenkins, Emory Ingraham, Patrick Haffert, Sebastiaan Kim, Daewook Choi, Heejoo Durney, Olivier Instrumentation and Methods for Astrophysics The Space Coronagraph Optical Bench (SCoOB) is a high-contrast imaging testbed built to demonstrate starlight suppression techniques at visible wavelengths in a space-like vacuum environment. The testbed is designed to achieve ${<}10^{-8}$ contrast from $3-10λ/D$ in a one-sided dark hole using a liquid crystal vector vortex waveplate and a 952-actuator Kilo-C deformable mirror (DM) from Boston Micromachines (BMC). We have recently expanded the testbed to include a field stop for mitigation of stray/scattered light, a precision-fabricated pinhole in the source simulator, a Minus K passive vibration isolation table for jitter reduction, and a low-noise vacuum-compatible CMOS sensor. We report the latest contrast performance achieved using implicit electric field conjugation (iEFC) at a vacuum of ${\sim}10^{-6}$ Torr and over a range of bandpasses with central wavelengths from 500 to 650nm and bandwidths (BW) from $\ll 1\%$ to 15\%. Our jitter in vacuum is $<3\times10^{-3} λ/D$, and the best contrast performance to-date in a half-sided D-shaped dark hole is $2.2\times10^{-9}$ in a $\ll 1 \%$ BW, $4\times10^{-9}$ in a 2\% BW, and $2.5\times10^{-8}$ in a 15\% BW. |
| title | The space coronagraph optical bench (SCoOB): 4. vacuum performance of a high contrast imaging testbed |
| topic | Instrumentation and Methods for Astrophysics |
| url | https://arxiv.org/abs/2406.18885 |