Figure Metrology of a Free-Form Optical Surface
نویسندگان
چکیده
The Infrared Multi-Object Spectrograph (IRMOS) is a facility instrument for the Kitt Peak National Observatory’s 3.8 m Mayall Telescope and an engineering prototype for a possible design of the Next Generation Space Telescope/Multi-Object Spectrograph. IRMOS requires a toroidal, off-axis, biconic camera mirror (“M4”) on an aluminum substrate for near-IR imaging and spectroscopy. This mirror (shown in Figure 1) presents significant fabrication difficulties due to its non-rotationally symmetric (NRS) form and tight tolerances [1]. Combining the capabilities of a long range fast tool servo (FTS) with a 400 μm maximum excursion and a diamond turning machine (DTM) with a 600 mm diameter part capacity has made it possible to fabricate large, free-form optics for demanding scientific applications.
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