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A Method of Measuring Pulse Laser Repetition Frequency Using it-ccd

An IT-CCD, measuring pulse technology, applied in the field of laser pulse parameter measurement, can solve the problems of limited pulse repetition frequency range, difficult to use high repetition frequency laser parameter measurement, etc. To achieve the effect of blanking

Inactive Publication Date: 2015-09-09
NORTHWEST INST OF NUCLEAR TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • A Method of Measuring Pulse Laser Repetition Frequency Using it-ccd
  • A Method of Measuring Pulse Laser Repetition Frequency Using it-ccd
  • A Method of Measuring Pulse Laser Repetition Frequency Using it-ccd

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Embodiment Construction

[0036] Such as figure 1 , figure 2 As shown, when the power of the pulsed laser incident on the IT-CCD is strong enough and will not destroy the photosensitive element of the IT-CCD, due to the interference effect, the main spot 2 and the secondary spot 2 will appear on the display screen 10 connected to the IT-CCD. Spot 1, main spot 2 is the imaging of the intensity distribution of the laser spot. Normally, due to the saturation of the IT-CCD interference, it appears as a connected saturated spot image of white flowers. figure 1 with figure 2 Only the outline of the laser spot is shown in. Secondary spot 1 is shown as a discontinuous straight line that passes through the center of mass of the spot, and comparative experiments show that the density of line segments in secondary spot 1 is the number of secondary spot units within a certain spatial length that is related to the repetition frequency of the pulsed laser , When the repetition frequency of the incident laser is high...

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Abstract

The invention discloses a method for measuring a repetition frequency of pulse laser by the aid of an IT-CCD (interline transfer area array-charge coupled device). The method includes performing calibration to obtain vertical transfer driving frequencies and frame frequencies of the IT-CCD; transmitting the measured pulse laser into a photosensitive surface of the IT-CCD; computing distances among adjacent subordinate facula units or the quantity of the subordinate facula units to obtain the repetition frequency of the pulse laser. The method can be used for measuring parameters of the laser with the high repetition frequency and a narrow pulse width and has the advantage of simplicity and reliability in principle.

Description

Technical field [0001] The invention belongs to a method for measuring laser pulse parameters, and specifically relates to a method for measuring the repetition frequency of laser pulses by using an IT-CCD (Interline Transfer Area CCD). Background technique [0002] In the measurement of laser pulse parameters, the repetition frequency (ie, repetition frequency) of the laser is usually measured by a unit photodetector combined with an oscilloscope. The principle is to convert laser pulses into voltage pulses through the photoelectric effect of the unit detector, and to detect the repetition frequency of electrical pulses 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, making it difficult to use this method for narrow pulse and high repetition laser parameter measurement. [0003] For lower frequency laser pulses, an image sensor can be used to measure the frequen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J11/00
Inventor 张震程德艳周孟莲马志亮陈绍武叶锡生冯国斌
Owner NORTHWEST INST OF NUCLEAR TECH