Statement of Work and Specifications for the Optical Design ... - ATST

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Document: SOW for Design and Analysis for HOWFSRevision: ADate: 14 June, 2013Figure-2 Conceptual Optical Design3. HOWFS OPTICAL REQUIREMENTS3.1 OPTICAL DESIGNThe HOWFS shall be a Shack-Hartmann wavefront sensor.3.2 WAVELENGTH RANGERequirement: 475-575 nm; Goal: 475-600nm.3.3 PUPIL DISTORTIONMaximum distortion introduced between the M10 pupil and the pupil at the HOWFS lenslet array shall beless than 0.11%. The Contractor shall provide a Zemax file that demonstrates compliance.3.4 PUPIL IMAGING CAPABILITYThe collimator lens shall piston to image the pupil and the sub-aperture focal plane images onto thedetector with no adjustment of the second Cooke triplet lens elements and detector piston. The Contractorshall evaluate the feasibility of reversing the position of the collimator and second Cooke triplet lens.Note: The full pupil diameter on the detector should not exceed the active sensor dimension of 11 mm,but be sufficiently large to image the lenslet array.3.5 PUPIL ADJUSTABILITYThe pupil size on the HOWFS lenslet array shall be adjustable to within 15% of its nominal value usingthe 1 st Cooke triplet.3.6 SUB-APERTURE FIELD OF VIEWEach sub-aperture of the HOWFS shall have a FOV of 10 0.5 arc seconds.3.7 SUB -APERTURE COUNTThe HOWFS shall contain 43 fully-illuminated subapertures across the pupil diameter, resulting in a totalof 1405 fully-illuminated subapertures. For purposes of this requirement, a fully-illuminated subapertureis defined as a subaperture whose active lenslet area is ≥ 90% filled by the telescope pupil.Page 8 of 10
Document: SOW for Design and Analysis for HOWFSRevision: ADate: 14 June, 2013Figure-3 Sub-apertures3.8 NOMINAL LENSLET ARRAY CONFIGURATION AND IMAGE SEPARATION3.8.1 Nominal Lenslet Array ConfigurationThe nominal focal length of the lenslets shall be 56 mm, +/- 1.5mm.The nominal diameter of the lenslets shall be 0.5mm. The tolerance on lens diameter and position are submicron.The Contractor may recommend a departure from the nominal focal length and diameter. The followingformula shall be used to derive a configuration:Focal length = ATST optical invariant * # sub-apertures * pitch diameter ^2/ FOVATST optical invariant = 51.5#sub-apertures = 43.2FOV = 10 arc-secondsPage 9 of 10
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Statement of Work and Specifications for the Optical Design ... - ATST

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