Optical focusing and collection system
AssigneesCommissariat A L'energie Atomique Et Aux Energies Alternatives, Centre National De La Recherche Scientifique
InventorsEric Clot, Isabelle Joumard, Vladimir Naletov, Olivier Klein
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Abstract
An optical focusing and collecting system includes: a first optical shaping portion, including an output surface, adapted to supply a primary light beam which is made annular; a second optical focusing and collecting portion, including a conical upper central reflective surface and a conical lower central reflective surface; a third optical return portion, including a reflective surface located between the output surface and the upper central reflective surface, along a main optical axis (Δ) and having transverse dimensions smaller than those of the annular primary light beam supplied by the first optical portion.
Claims10
An optical focusing and collecting system, intended to focus on a sample to be analysed, a primary light beam emitted by an optical emitter, and to collect a secondary light beam emitted by the sample in response to the primary light beam and to transmit the secondary light beam to a photodetection system, wherein the optical focusing and collecting system includes several optical portions each centred along a main optical axis:
- a first optical portion having an input surface and an output surface, wherein the input surface is configured to receive the primary light beam and supply the primary light beam to the output surface to form an annular primary light beam around the main optical axis;
- a second optical portion, including:
- an upper central conical reflective surface formed by a central area surrounded by a peripheral area, and configured to reflect by the peripheral area the annular primary light beam originating from the output surface of the first optical portion, and to reflect by the central area the secondary light beam originating from a lower central conical reflective surface;
- the lower central conical reflective surface configured to reflect and focus on the sample the primary light beam originating from the upper central conical reflective surface;
- and to collect and reflect the secondary light beam emitted by the sample;
- at least two truncated conical and peripheral reflective surfaces, the truncated conical and peripheral reflective surfaces being configured to optically couple the upper central conical reflective surface and the lower central conical reflective surface;
- and
- a third optical return portion, including a reflective surface:
- located between the output surface of the first optical portion and the upper central conical reflective surface of the second optical portion, along the main optical axis and having transverse dimensions smaller than those of the annular primary light beam supplied by the output surface, and
- configured to reflect in the direction of the photodetection system, the secondary light beam originating from the central area of the upper central conical reflective surface.
Dependencies are inferred from the claim text.