title: Diffraction effects on broadband radiation: formulation for computing total irradiance.
abstract: I present a formulation for treating diffraction effects on total irradiance in the case of a Planck source; earlier work generally depended on calculating diffraction effects on spectral irradiance followed by summation over spectral components. The formulation is derived and demonstrated for Fraunhofer diffraction by circular apertures, rectangular apertures and slits, and Fresnel diffraction by circular apertures. The prospects for treating other sources and optical systems are also discussed.
authors.affiliation: Optical Technology Division, National Institute of Standards and Technology, 100 Bureau Drive, MS 8441, Gaithersburg, Maryland 20899-8441, USA. eric.shirley@nist.gov
authors.forename: Eric L
authors.initials: EL
authors.lastname: Shirley