Linear spectrometer
First Claim
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1. A linear spectrometer for spectrally measuring an optical signal, comprising:
- an input far receiving said optical signal along an optical axis;
a diffraction grating for separating the optical signal received at the input into spectral components thereof, each spectral component being diffracted at a diffraction angle θ
from said optical axis;
an optical correcting element having an effective focal length f, said optical correcting element focusing said spectral components on an image plane in accordance with an f sin(θ
) distribution, wherein said optical correcting element comprises a group of lenses; and
detecting means for detecting said spectral components in the image plane.
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Abstract
A linear spectrometer for spectrally measuring an optical signal. The spectrometer has an input receiving the signal which is then diffracted onto a diffraction grating. The signal is therefore divided into its spectral components, each component being diffracted at an angle θ. A correcting element, such as a lens, a group of lenses, a mirror, etc. is provided for focusing the spectral components on an image plane where they are detected. The correcting element is designed so that the resulting distribution of the spectral components on the image plane is linear with respect to the component'"'"'s wavelength.
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Citations
14 Claims
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1. A linear spectrometer for spectrally measuring an optical signal, comprising:
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an input far receiving said optical signal along an optical axis;
a diffraction grating for separating the optical signal received at the input into spectral components thereof, each spectral component being diffracted at a diffraction angle θ
from said optical axis;
an optical correcting element having an effective focal length f, said optical correcting element focusing said spectral components on an image plane in accordance with an f sin(θ
) distribution, wherein said optical correcting element comprises a group of lenses; and
detecting means for detecting said spectral components in the image plane. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A linear spectrometer for spectrally measuring an optical signal, comprising:
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an input for receiving said optical signal along an optical axis;
a diffraction grating for separating the optical signal received at the input into spectral components thereof, each spectral component being diffracted at a diffraction angle θ
from said optical axis;
an optical correcting element having an effective focal length f, said optical correcting element focusing said spectral components on an image plane in accordance with an f sin(θ
) distribution, wherein said optical correcting element comprises a mirror; and
detecting means for detecting said spectral components in the image plane. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification
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Current AssigneeInstitut national d'optique
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Original AssigneeInstitut national d'optique
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InventorsThibault, Simon, Paquet, Carl
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Primary Examiner(s)Evans, F. L.
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Application NumberUS09/952,718Publication NumberTime in Patent Office797 DaysField of Search356/326, 356/328, 356/305, 356/334US Class Current356/328CPC Class CodesG01J 2003/2866 Markers; Calibrating of scanG01J 3/02 DetailsG01J 3/0208 using focussing or collimat...G01J 3/28 Investigating the spectrum ...G02B 13/0005 having F-Theta characterist...
