Optical spectrometer with several spectral bandwidths
AssigneeActerna Eningen GmbH
InventorsThomas Fuhrmann, Wolfgang Schmid, Michael Pahlke
Life of this patent
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Abstract
An optical spectrometer comprises at least two coupling apertures with different mode field diameters, a means for dispersing the light beams exiting each of the coupling apertures along a dispersion axis and at least two decoupling apertures on which the dispersed light beams are imaged and whose mode field diameters each correspond to the mode field diameters of the associated coupling apertures. Due the enlarged mode field diameter, a larger spectral fraction of dispersed light beams, i.e., light of a larger spectral bandwidth, can be coupled into the decoupling aperture than into the decoupling aperture.
Claims19
An optical spectrometer, in particular spectrum analyzer, comprising:
- at least two coupling apertures with different mode field diameters,
- means for dispersing the light beams each exiting the coupling apertures along a dispersion axis, and,
- at least two decoupling apertures on which the dispersed light beams are each imaged and whose mode field diameters each correspond to the mode field diameters of the associated coupling apertures.
An optical spectrometer comprising:
- a first coupling aperture having a first core diameter;
- a second coupling aperture having a second core diameter that is larger than the first core diameter;
- a dispersion device arranged to disperse light beams coming from the first and second coupling apertures;
- a first decoupling aperture operable to receive the light beam coming through the dispersion device from the first coupling aperture;
- and
- a second decoupling aperture operable to receive the light beam coming through the dispersion device from the second coupling aperture.
Dependencies are inferred from the claim text.