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US 5,144,374 AGranted
Optical spectroscopy system
AssigneeCSELT - Centro Studi e Laboratori Telecommunicazioni S.p.A.
InventorGiorgio Grego
Life of this patent
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Abstract
An optical spectroscopy system, wherein a pulse of a radiation to be analyzed is sent to a diffractive element presenting high temporal chromatic dispersion, and information relevant to the radiation spectrum is obtained from pulse broadening in the time domain.
Claims9
A method of spectral analysis of light radiation, comprising the steps of:
- a) sending a pulse of light radiation into a diffractive element of known and controlled characteristics and capable of causing temporal and spatial dispersion of various wavelengths in the radiation sent into said diffractive element;
- b) evaluating the dispersion of the wavelengths in the radiation leaving said diffractive element;
- and
- c) determining a position of a spatially dispersed pulse on a detector by deflecting wavelengths differently upon output from said diffractive element, thereby obtaining information on said wavelengths.
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An apparatus for the spectral analysis of a light radiation, comprising:
- a source emitting pulses of said radiation;
- a diffractive element positioned to receive said light radiation from said source, along which a pulse of said radiation propagates and causing time and spatial dispersion of the wavelengths present in the radiation and outputting radiation which has been subjected to time and spatial dispersion;
- detection and analysis means receiving radiation subjected to time and spatial dispersion of wavelengths present in the radiation, for supplying information relating to dispersion undergone by the pulse because of propagation along said diffractive element;
- and
- a processing system extracting information on a spectrum of said source from output signals of said detection and analysis means by comparison of said output signals with data relevant to dispersion characteristics of said diffractive element stored in said processing system, said detection and analysis means comprising means receiving radiation outgoing from said diffractive element and subjecting it to deflection, said processing system obtaining information on the spectrum from positions at which different ones of said wavelengths arrive on a detector of said detection and analysis means.
2 more elements
Dependencies are inferred from the claim text.