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It-ccd method for measuring pulse laser repetition frequency based on main spot blanking technology

An IT-CCD, measuring pulse technology, applied in the field of laser pulse parameter measurement, can solve the problems of difficult to use high repetition frequency laser parameter measurement, limited pulse repetition frequency range, etc., to achieve convenient calculation of sub-spot parameters, simple and reliable principle, To achieve the effect of blanking

Inactive Publication Date: 2015-09-09
NORTHWEST INST OF NUCLEAR TECH
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  • Application Information

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Problems solved by technology

The pulse repetition frequency range that can be measured by this method is limited by the frame rate of the image sensor, making it difficult to measure high repetition rate laser parameters

Method used

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  • It-ccd method for measuring pulse laser repetition frequency based on main spot blanking technology
  • It-ccd method for measuring pulse laser repetition frequency based on main spot blanking technology
  • It-ccd method for measuring pulse laser repetition frequency based on main spot blanking technology

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Embodiment Construction

[0043] like figure 1 , figure 2 As shown, when the pulse laser power incident to the IT-CCD is strong enough and will not destroy the IT-CCD photosensitive element, due to the interference effect, the main spot 2 and the secondary spot will appear on the display screen 10 connected with the IT-CCD. Spot 1 and main spot 2 are the imaging of the intensity distribution of the laser spot. Usually, due to the saturation of IT-CCD interference, it appears as a saturated spot image of continuous white flowers. figure 1 and figure 2 Only a schematic outline of the laser spot is given in . Sub-spot 1 is a discontinuous straight line, which passes through the center of mass of the spot, and comparative experiments show that the density of line segments in sub-spot 1, that is, the number of sub-spot units within a certain space length, is related to the repetition frequency of the pulse laser , when the repetition frequency of the incident laser light is higher, the line segments in...

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Abstract

The invention discloses an interline-transfer charge coupled device (IT-CCD) pulse laser repetition frequency measuring method based on a main facula blanking technology. The method includes that calibration is conducted to obtain IT-CCD vertical transfer driving frequency and frame frequency, measured pulse laser is emitted to an IT-CCD photosensitive plane, IT-CCD effective integral time is adjusted to blank a main facula, a gap between adjacent auxiliary facula units or the number of auxiliary facula units is calculated to obtain repetition frequency of pulse laser. The measuring method can be used for measuring laser parameters with high repetition frequency and narrow pulse width, blanks a main facula image effectively and has the advantages of being simple in principle and reliable and the like.

Description

technical field [0001] The invention belongs to a method for measuring laser pulse parameters, in particular to a method for measuring the repetition frequency of laser pulses by using an IT-CCD (interline transfer array CCD). Background technique [0002] In the measurement of laser pulse parameters, the repetition frequency (repetition frequency) of the laser is usually measured with a unit photodetector combined with an oscilloscope. The principle is to convert the laser pulse into a voltage pulse through the photoelectric effect of the unit detector, and detect the repetition frequency of the electric pulse through an oscilloscope. In this method, the response speed of the unit detector limits the upper limit of the measured repetition frequency and the laser pulse width, which makes this method difficult to be used in the measurement of laser parameters with narrow pulse and high repetition frequency. [0003] For lower frequency laser pulses, an image sensor can be us...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J11/00
Inventor 张震程德艳周孟莲韦成华王立君陈绍武冯国斌
Owner NORTHWEST INST OF NUCLEAR TECH