IRS: the Spectrograph on SIRTF; Its Fabrication and Testing

The Infrared Spectrograph, IRS, for SIRTF is a set of four compact low and medium resolution infrared spectrographs designed to work in the wavelength range from 5.3 to 40 μm at resolutions, λ/∆λ, from 65 to 600. The design involves all reflecting optics with no moving parts. The basic design philosophy, the fabrication process, the test program, and the realtime pointing capabilities are discussed.