Laser far field focal spot measurement method based on orthogonal light wedge dichroism and focal spot reconstruction algorithm

A technology of far-field focal spot and spectroscopic characteristics, applied in the field of measurement of laser far-field focal spot, can solve problems such as measurement result errors, meet the requirements of relaxing the beam control system, avoid small defocus problems, and expand the dynamic range of measurement Effect

Active Publication Date: 2012-07-11
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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Problems solved by technology

This method is simple in principle and easy to operate. The experiment requires a long focal length focusing system, but in principle, there are more or less defocus aberrations between the sub-spots obtained by this method, which will affect the measurement results. introduce some error

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  • Laser far field focal spot measurement method based on orthogonal light wedge dichroism and focal spot reconstruction algorithm
  • Laser far field focal spot measurement method based on orthogonal light wedge dichroism and focal spot reconstruction algorithm
  • Laser far field focal spot measurement method based on orthogonal light wedge dichroism and focal spot reconstruction algorithm

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specific Embodiment

[0038] Specific embodiment: focusing lens aperture f=400mm, laser wavelength λ=650nm, beam aperture Ф=1.2mm, two optical wedge angles used in the experiment are placed orthogonally to each other, wherein the wedge angle of optical wedge 1 faces the vertical direction , the wedge angle of the optical wedge 2 is oriented horizontally, the refractive index of the optical wedge glass is 1.514, the number of pixels on the CCD photosensitive surface is 582×782, the size of a single pixel is 8μm×8μm, and the digital signal output is 8bit.

[0039] The method for determining the theoretical value of the center interval of each adjacent sub-spot formed on the photosensitive surface of the CCD detector: as figure 2 As shown, the angle between the front surface A and the back surface B of the optical wedge is θ. When the incident beam 1 is irradiated vertically on the front surface of the optical wedge, after being transmitted and reflected by the inner and outer surfaces of the front an...

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Abstract

The invention provides a laser far field focal spot measurement method based on orthogonal light wedge dichroism and a focal spot reconstruction algorithm. A measurement apparatus used in the method comprises a pair of orthogonal light wedges, a focusing lens, a CCD imaging device and a computer system. Beam splitting is performed to an incident laser beam through two light wedge device whose wedge angle directs to a mutually orthogonal direction and the incident laser beam is converged through the focusing lens. After that, the incident laser beam forms sub-spot array with successively damped peak strength on a CCD photosensitive surface in a lens plane. An effective method is used to carry out splicing fusion on each of the measured sub-spot. And finally, complete laser far field focal spot intensity distribution can be obtained through reconstruction. According to the invention, CCD dynamic measurement range can be greatly developed; a lot of high-frequency side-lobe information of the actual focal spot can be extracted from CCD background noise so that accurate measurement and light beam quality evaluation can be possibly achieved.

Description

technical field [0001] The invention relates to the technical field of laser far-field focal spot measurement, in particular to a laser far-field focal spot measurement method based on an orthogonal optical wedge beam splitting characteristic and a focal spot reconstruction algorithm, which has the characteristics of simple structure and convenient implementation. Background technique [0002] Accurate measurement of the spatial energy distribution of the laser far-field focal spot is a prerequisite for correct evaluation of the beam quality. At present, there are many methods for measuring the laser far-field focal spot, including scanning method, photosensitive method, ablation method and array detection method, etc. Among them, the scanning method has poor real-time performance in measuring the energy distribution of the far-field focal spot, and it has a great influence on the stability of the light source. There are certain requirements; photosensitive method and ablati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J1/00G01B11/00
Inventor 贺元兴李新阳
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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