Techniques and uncertainty analysis for interferometric surface figure error measurement of spherical mirrors at 20K

Blake, P.; Mink, Ronald G.; Davila, Pamela S.; Robinson, F. David; Antonille, Scott

doi:10.1117/12.508300

Cited by 2 publications

(2 citation statements)

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“…This aberration has been modeled, as described in the authors' previous paper 4 . First, a model of our test was prepared in the software program Zemax®.…”

Section: Window Aberrationsmentioning

confidence: 99%

High-accuracy surface figure measurement of silicon mirrors at 80 K

Blake

Mink

Chambers

et al. 2004

Optical Fabrication, Metrology, and Material Advancements for Telescopes

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This report describes the equipment, experimental methods, and first results at a new facility for interferometric measurement of cryogenicallycooled spherical mirrors at the Goddard Space Flight Center Optics Branch. The procedure, using standard phase-shifting interferometry, has an standard combined uncertainty of 3.6 nm nns in its representation of the two-dimensional surface figure error at 80, and an uncertainty of rt 1 nm in the rms statistic itself. The first mirror tested was a concave spherical silicon foam-core mirror. with a clear aperture of 120 mm. The optic surface was measured at room temperature using standard "absolute" techniques; and then the change in surface figure error from room temperature to 80 K was measured. The mirror was cooled within a cryostat. and its surface figure error measured through a fused-silica window. The facility and techniques will be used to measure the surface figure error at 20K of prototype lightweight silicon carbide and CesicTM mirrors developed by Galileo Avionica (Italy) for the European Space Agency (ESA).

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“…This aberration has been modeled, as described in the authors' previous paper 4 . First, a model of our test was prepared in the software program Zemax®.…”

Section: Window Aberrationsmentioning

confidence: 99%

High-accuracy surface figure measurement of silicon mirrors at 80 K

Blake

Mink

Chambers

et al. 2004

Optical Fabrication, Metrology, and Material Advancements for Telescopes

Self Cite

View full text Add to dashboard Cite

show abstract

“…High precision figure metrology efforts at Goddard have achieved a repeatability near 1nm RMS. 5 We budget 1.3nm RMS for transmission sphere characterization uncertainty. The wavefront error from the diffractive CGH mask will also be mapped.…”

Section: Test Planmentioning

confidence: 99%

High-precision metrology on the ultra-lightweight UV 51-cm f/1.25 parabolic SHARPI primary mirror using a CGH null lens

Antonille

Rabin

Wallace

et al. 2004

Optical Fabrication, Metrology, and Material Advancements for Telescopes

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For potential use on the SHARPI mission, Eastman Kodak has delivered a 50.8cm CA f/1.25 ultra-lightweight UV parabolic mirror with a surface figure error requirement of 6nm RMS. We address the challenges involved in verifying and mapping the surface error of this large lightweight mirror to 3nm RMS using a diffractive CGH null lens. Of main concern is removal of large systematic errors resulting from surface deflections of the mirror due to gravity as well as smaller contributions from system misalignment and reference optic errors. We present our efforts to characterize these errors and remove their wavefront error contribution in post-processing as well as minimizing the uncertainty these calculations introduce. Data from Kodak and preliminary measurements from NASA Goddard will be included.

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Techniques and uncertainty analysis for interferometric surface figure error measurement of spherical mirrors at 20K

Cited by 2 publications

References 0 publications

High-accuracy surface figure measurement of silicon mirrors at 80 K

High-accuracy surface figure measurement of silicon mirrors at 80 K

High-precision metrology on the ultra-lightweight UV 51-cm f/1.25 parabolic SHARPI primary mirror using a CGH null lens

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