Diffraction optical modelling of far infrared spectrometers

Details Diffraction optical modelling of far infrared spectrometers Diffraction optical modelling of far infrared spectrometers

Apr 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989spie.1013...66s&link_type=abstract

IN: Optical design methods, applications, and large optics; Proceedings of the Meeting, Hamburg, Federal Republic of Germany, Se

Physics

Optics

Far Infrared Radiation, Infrared Spectrometers, Optical Properties, Wave Diffraction, Design Analysis, Focusing, Mathematical Models, Point Spread Functions

Scientific paper

At 45-180 microns, the energy losses by diffraction at the different optical surfaces of a spectrometer cannot be neglected. Specific optical software has been developed to simulate the multiple diffraction effects existing in the long-wavelength spectrometer (LWS) on the ESA IR satellite ISO. The optical design of the spectrometer is briefly described, and the use of an off-axis aspherical grating for a compact and flexible design is demonstrated. The mathematical model, based on Fourier-Fraunhofer diffraction theory, is explained. The diffraction effects due to the wavefront limitation, at the relevant levels, and the wavefront aberrations of the spectrometer are modeled. This model has been used to optimize the LWS optics and to define tolerances for the manufacturing and the adjustment of the optical system.

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