Linear spectrometer
AssigneeInstitut National D'Optique
InventorsSimon Thibault, Carl Paquet
Life of this patent
Estimating the term…
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.
Claims14
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.
A linear spectrometer for spectrally measuring an optical signal, comprising:
- 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.
Dependencies are inferred from the claim text.