How we split the IASI beamsplitter

Francois Henault; Christian Buil; Antoine Copin; Benoit Chidaine; Xavier Bozec

doi:10.1117/12.363808

28 September 1999 How we split the IASI beamsplitter

Francois Henault, Christian Buil, Antoine Copin, Benoit Chidaine, Xavier Bozec

Proceedings Volume 3786, Optomechanical Engineering and Vibration Control; (1999) https://doi.org/10.1117/12.363808
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

Abstract

The IASI instrument is a fourier-transform spectrometer (FTS) providing spectra of the Earth's atmosphere observed from space. The heart of the instrument is a Michelson interferometer (IHOS) equipped with hollow cube-corners retro-reflectors in place of the classical flat mirrors. One of the most critical components of the IHOS is its IR beamsplitter dividing and recombining the incident rays in order to create the interferograms. The beamsplitter chromatisms must not exceed a quarter-wave, while the required transmission efficiency should ideally be higher than 0.35 over the whole. Instrument spectral domain, with a particular emphasis on the radiometric performance between 14 and 15.5 micrometers due to mission constraints. Practically, it would dictate the choice of the Potassium Bromide material for the plates substrate, however this material presents severe moisture and mechanical constraints. This is the reason why we have looked for an alternative solution based on the use of thin ZnSe plates. Theoretical analyses and numerical examples of the beamsplitter radiometric and chromatic performance confirm that this design is feasible for two different geometrical configurations: a classical beamsplitter with grouped parallel plates, and a rather unusual design including a remote compensating plate which will be set perpendicular to the transmitted optical beam.

Citation Download Citation

Francois Henault, Christian Buil, Antoine Copin, Benoit Chidaine, and Xavier Bozec "How we split the IASI beamsplitter", Proc. SPIE 3786, Optomechanical Engineering and Vibration Control, (28 September 1999); https://doi.org/10.1117/12.363808

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