Refractive-diffractive spectrometer
AssigneeRoygbiv, LLC
InventorEdward M. Granger
Life of this patent
Estimating the term…
Abstract
A diffraction grating and a prism with the appropriate characteristics are employed to provide a combined dispersive characteristic that is substantially linear over the visible spectrum. Radiation from the grating and prism is collimated by a lens towards a detector array. The grating or a telecentric stop between the grating and prism is placed at a focal point of the lens in a telecentric arrangement so that equal magnification is achieved at the detector array. If the detector array is replaced by a plurality of optical channels, a multiplexer/demultiplexer is obtained.
Claims58
An apparatus, comprising at least a first and a second element that disperse electromagnetic radiation according to wavelength, said at least two elements having a combined dispersive characteristic such that they substantially linearly disperse the electromagnetic radiation over at least a portion of an electromagnetic spectrum, wherein said at least two elements are arranged so that the apparatus is substantially telecentric.
An optical apparatus, comprising:
- at least a first and a second element that disperse electromagnetic radiation according to wavelength, said at least two elements having a combined dispersive characteristic such that they substantially linearly disperse the electromagnetic radiation over at least a portion of an electromagnetic spectrum, wherein said at least two elements are arranged so that the apparatus is substantially telecentric;
- and
- input/output optical channels conveying electromagnetic radiation signals to or from the at least two elements, said at least two elements multiplexing or demultiplexing the electromagnetic radiation signals.
An apparatus, comprising at least a first and a second element that disperse electromagnetic radiation according to wavelength, said at least two elements having a combined dispersive characteristic such that they disperse the electromagnetic radiation over at least a portion of an electromagnetic spectrum more evenly than by only one of the two elements, wherein said at least two elements are arranged so that the apparatus is substantially telecentric.
A method for measuring a radiation source, comprising:
- passing radiation from the source to at least a first and a second element that disperse electromagnetic radiation according to wavelength, said at least two elements having a combined dispersive characteristic such that they substantially linearly disperse the electromagnetic radiation over at least a portion of an electromagnetic spectrum, wherein said elements are arranged to form a substantially telecentric system;
- and
- measuring wavelength components of the radiation that is dispersed by the elements.
A optical method for multiplexing or demultiplexing electromagnetic radiation signals, comprising:
- providing at least a first and a second element that disperse electromagnetic radiation according to wavelength, said at least two elements having a combined dispersive characteristic such that they substantially linearly disperse the electromagnetic radiation over at least a portion of an electromagnetic spectrum;
- and
- conveying electromagnetic radiation signals to or from the at least two elements in relation to an optical channel, wherein said elements provided are arranged to form a substantially telecentric system, said at least two elements multiplexing or demultiplexing the electromagnetic radiation signals.
An apparatus comprising at least a refractive and a diffractive optical component, said at least two components having a combined dispersive characteristic such that they substantially linearly disperse electromagnetic radiation over at least a portion of an electromagnetic spectrum, wherein said at least two components are arranged so that the apparatus is substantially telecentric.
Dependencies are inferred from the claim text.