Multi-channel spectrum analyzer
First Claim
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1. A multi-channel spectrum analyzer with a plane transmission diffraction grating, comprising:
- a. radiation collecting and delivery elements adapted to collect radiation simultaneously from a plurality of points of one or more sources of electromagnetic radiation and to deliver a spatial distribution of the radiation to a spectrum disperser;
b. a spectrum disperser coupled to said radiation collecting and delivery elements for transmitting radiation, the spectrum disperser comprising i. an entry port, ii. a composite collimating lens for transforming divergent beams of polychromatic radiation emerging from the entry port into collimated polychromatic beams, iii. a transmission diffraction grating for transforming each collimated polychromatic beam from the first lens into a fan of collimated monochromatic beams, and iv. a composite focusing objective to transform each collimated monochromatic beam in each fan into a separate spot of radiation of a flat spectral image;
c. a photodetector array placed in the plane of the flat spectral image for collecting radiation transmitted by the spectrum disperser and convert said radiation transmitted by the spectrum disperser into an electric signal.
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Abstract
A spectrum analyzer for the simultaneous analysis of electromagnetic radiation delivered to it from either multiple sources or from a linear segment along a source surface, and arranged as either continuous or discrete set of points along a short piece of a straight line referred to herein as a slit. In one embodiment of the invention, the optical design of the dispersing part of the analyzer provides essentially stigmatic spots for any spectral band up to one octave wide in the spectral range of about 400 nm to about 2500 nm.
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Citations
20 Claims
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1. A multi-channel spectrum analyzer with a plane transmission diffraction grating, comprising:
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a. radiation collecting and delivery elements adapted to collect radiation simultaneously from a plurality of points of one or more sources of electromagnetic radiation and to deliver a spatial distribution of the radiation to a spectrum disperser;
b. a spectrum disperser coupled to said radiation collecting and delivery elements for transmitting radiation, the spectrum disperser comprising i. an entry port, ii. a composite collimating lens for transforming divergent beams of polychromatic radiation emerging from the entry port into collimated polychromatic beams, iii. a transmission diffraction grating for transforming each collimated polychromatic beam from the first lens into a fan of collimated monochromatic beams, and iv. a composite focusing objective to transform each collimated monochromatic beam in each fan into a separate spot of radiation of a flat spectral image;
c. a photodetector array placed in the plane of the flat spectral image for collecting radiation transmitted by the spectrum disperser and convert said radiation transmitted by the spectrum disperser into an electric signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification