Diffraction Optical Modelling Of Far Infrared Spectrometers

Michel Saisse; Patrick Rabou

doi:10.1117/12.949363

13 April 1989 Diffraction Optical Modelling Of Far Infrared Spectrometers

Michel Saisse, Patrick Rabou

Proceedings Volume 1013, Optical Design Methods, Applications and Large Optics; (1989) https://doi.org/10.1117/12.949363
Event: 1988 International Congress on Optical Science and Engineering, 1988, Hamburg, Germany

Abstract

At far Infrared wavelengths (45 to 180 micrometers) the energy losses by diffraction at the different optical surfaces of a spectrometer cannot be neglected. A specific optical software has been develooped to simulate the multiple diffraction effects existing in the Long Wavelength Spectrometer (LWS), one of the four scientific instruments of the ESA Infrared Satellite ISO. The optical design of the spectrometer is briefly described, the interest of the use of an off-axis aspherical grating for a compact and flexible design is demonstrated. The mathematical model based on the 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 modelled. The main results are given and discussed. The emphasis is set on the study of the energy losses due to multiple diffractions. Finally this model has been used to optimise the LWS optics and to define tolerances for the manufacturing and the adjustment of the optical system.

Citation Download Citation

Michel Saisse and Patrick Rabou "Diffraction Optical Modelling Of Far Infrared Spectrometers", Proc. SPIE 1013, Optical Design Methods, Applications and Large Optics, (13 April 1989); https://doi.org/10.1117/12.949363

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available