Quasi-monochromatic calibration source for the wavelength range from 0.22microm to 7.0microm

This paper describes an optical system (consisting of a calibrated radiation source, a special double monochromator, and a Cassegrain telescope) that produces a quasi-monochromatic beam with known radiation power at its exit. The wavelength range extends from 0.22 microm to 7.0 microm. The spectral bandwidth may be varied within certain limits (0.0004-0.16 microm). The emerging light beam is either divergent (f/13.8) or parallel, and without any spectral structure. Some important remarks concerning the calibration procedure of the monochromator (polarization, slitwidths, etc.) are given.