Laser detector
AssigneeFenix Research Corporation
InventorYong Jin Lee
Life of this patent
Estimating the term…
Abstract
A system and method are provided for characterizing a laser using a diffraction grating. The system includes a lens that projects diffraction patterns from the diffraction grating as an image of diffraction peaks onto a plane. Optical sensors then sense the diffraction peaks. A processor connected to the optical sensors applies the laser characterization method to determine the laser wavelength, irradiance and angle of incidence. In the method, the processor obtains the diffraction peak measurements from the optical sensors and applies a transform to arrange the diffraction peaks into a grid of regularly spaced peaks. The processor then applies convolution kernels to analyze the grid of regularized peaks to determine a wavelength, irradiance and angle of incidence of the laser.
Claims22
A method for characterizing a laser comprising:
- obtaining an array of diffraction peaks from a laser beam strike on a diffraction grating;
- using an optical lens to project the array of diffraction peaks as an image;
- sensing the diffraction peaks from the image by optical sensors;
- applying a transform to the image to arrange the diffraction peaks into a grid of regularly spaced peaks;
- performing a cross-correlation of a plurality of convolution kernels with the grid of regularly spaced peaks, each of the plurality of convolution kernels having a different pitch;
- analyzing the cross-correlation of the plurality of the convolution kernels to determine a wavelength of the laser beam;
- and
- analyzing the cross-correlation of the plurality of the convolution kernels to determine the irradiance of the laser beam from intensity profiles of the grid of regularly spaced peak.
An apparatus for characterizing a laser comprising:
- a diffraction grating for receiving a laser beam strike;
- a lens that projects diffraction patterns from the diffraction grating as an image of diffraction peaks onto a plane;
- optical sensors for sensing diffraction peaks from the image output from the diffraction grating resulting from the laser beam strike;
- a processor connected to the optical sensors, the processor being configured to:
- obtain the array of diffraction peaks from the laser beam strike;
- apply a transform to arrange the diffraction peaks into a grid of regularly spaced peaks;
- performing a cross-correlation of a plurality of convolution kernels with the grid of regularly spaced peaks, each of the plurality of convolution kernels having a different pitch;
- analyzing the cross-correlation of the plurality of the convolution kernels to determine a wavelength of the laser beam;
- and
- analyzing the cross-correlation of the plurality of the convolution kernels to determine the irradiance of the detected laser beam from intensity profiles of the grid of regularly spaced peaks.
Dependencies are inferred from the claim text.