Wide-band spectrometer with objective comprising an aspherical corrector mirror
AssigneeGalileo Avionica S.p.A.
InventorsAlberto Caruso, Andrea Romoli, Matteo Taccola
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Abstract
The spectrometer comprises at least a first optical path for a beam of electromagnetic radiation, along which the following are set: a beam-entry slit (1) for an incoming beam; a collimator (5) comprising a convergent spherical mirror for collimation of the incoming beam; a first dispersor (9) for dispersion of the beam into its chromatic components; a first focusing system (19); and a first detector (21) which receives the beam dispersed and focused by said first focusing system. Set along the first optical path there is set at least one first aspherical corrector element (7; 17) comprising an aspherical mirror for correction of spherical aberration.
Claims22
A spectrometer comprising at least one first optical path for a beam of electromagnetic radiation, along which the following are set:
- a beam-entry slit for an incoming beam;
- a collimator for collimation of the incoming beam;
- a first dispersor for dispersion of the beam into its chromatic components;
- a first focusing system;
- and a first detector which receives the beam dispersed and focused by said first focusing system;
- along said first optical path there being set at least a first aspherical corrector element for correction of spherical aberration, characterized in that:
- said collimator comprises a convergent spherical mirror;
- said first focusing system comprises a convergent spherical mirror;
- and
- said first aspherical corrector element comprises a first aspherical mirror.
The spectrometer according to one or more of the foregoing claims, characterized in that, along said first optical path, there is set an optical element for correction of the curvature of field and the curvature of the image of the slit.
The spectrometer according to claim 9 or 10, characterized in that said optical element for correcting the curvature of field and the curvature of the image of the slit is set along said first optical path between the beam-entry slit and the convergent spherical mirror of said collimator.
The spectrometer according to one or more of the foregoing claims, characterized in that said first dispersor is a prismatic disperser.
The spectrometer according to one or more of the foregoing claims, characterized in that said collimator and said focusing system have different focal lengths.
The spectrometer according to one or more of the foregoing claims, characterized in that it comprises, along said first optical path, a beam splitter, downstream of which said first optical path is prolonged and a second optical path develops, there being set at least one second detector along said second optical path.
Dependencies are inferred from the claim text.