A Fourier transform spectrometer without a beam splitter for the vacuum ultraviolet range : From the optical design to the first UV spectrum

Nelson de Oliveira (1) , Denis Joyeux (2) , Daniel Phalippou (2) , Jean-Claude Rodier (2) , François Polack (3) , Michel Vervloet (3) , Laurent Nahon (1)

1 Ligne DESIRS [Saint Aubin]
2 Laboratoire Charles Fabry de l'Institut d'Optique / Scop
3 SSOLEIL - Synchrotron SOLEIL

We describe a Fourier transform (FT) spectrometer designed to operate down to 60 nm (20 eV) on a synchrotron radiation beamline for high resolution absorption spectrometry. As far as we know, such an instrument is not available below 140 nm mainly because manufacturing accurate and efficient beam splitters remains a major problem at these wavelengths, especially if a wide bandwidth operation is desired. In order to overcome this difficulty, we developed an interferometer based on wave front division instead of amplitude division. It relies on a modified Fresnel bimirror configuration that requires only flat mirrors. The instrument provides path difference scanning through the translation of one reflector. During the scanning, the moving reflector is controlled by an optical system that keeps its direction constant within a tolerable value and provides an accurate interferometric measurement of the path difference variation...

Domains: Physics [physics]; Physics [physics]; Optics [physics.optics]

Nelson de Oliveira, Denis Joyeux, Daniel Phalippou, Jean-Claude Rodier, François Polack, et al.. A Fourier transform spectrometer without a beam splitter for the vacuum ultraviolet range : From the optical design to the first UV spectrum. Review of Scientific Instruments, 2009, 80 (4), pp.043101. ⟨10.1063/1.3111452⟩. ⟨hal-00648580⟩