Field Widened Michelson Interferometer

2026-11-03

The University of Wisconsin - Madison ' s Space Science and Engineering Center is requesting bids for the purchase a field - widened Michelson Interferometer . TECHNICAL SPECIFICATIONS All specifications are defined as mandatory minimum requirements unless otherwise stated . Failure to meet a mandatory requirement shall disqualify your bid , unless no bid meets that requirement . If no bidder can comply with a given specification , condition of bid or provide a specific item / service requested , Purchasing reserves the right to delete that specification , condition of bid or item without having to complete the bid process again . UW - Madison SSEC FWMI Specifications : 1 . Operating wavelength : 1064 nm 2 . FSR : 1 . 5 GHZ +/- 0 . 2 % 3 . Clear aperture : 28 mm 4 . FOV : 4 mrad 5 . Surface flatness : λ / 10 @ 633 nm 6 . Glass arm material : fused silica , n = 1 . 44963 , CTE = 0 . 51 ppm 7 . Air arm composite spacer CTE : 14 . 4 ppm 8 . Air arm length : 89 . 30 mm 9 . Glass arm length : 129 . 41 ( matched to air arm to within FSR tolerance ) 10 . Tilt angle : 26 . 2 mrad ( 1 . 5 degrees ) 11 . Beam splitter : 50 . 0 +/- 2 . 5 % reflectivity at 1064 nm at 45 - degree incidence 12 . AR coatings : < 0 . 25 % reflectivity 13 . Mirror reflectivity : > 99 . 5 % 14 . Required minimum ratio of maximum transmission to minimum transmission ( Tmax / Tmin ) = 50 . ( Ideal would be 100 .) Other requirements : 1 . Mount for the interferometer . For example , an invar sandwich attached with RTV silicon . 2 . Design for composite air arm spacer

Wisconsin

2026-05-06