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Variable pulse width laser device

A laser and laser generator technology, applied in the field of laser shock strengthening

Inactive Publication Date: 2013-10-09
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] How to realize the existing variable pulse width laser? problems, cost

Method used

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  • Variable pulse width laser device

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The pulse width of the laser generator 1 is 10ns, the distance between the two mirrors of the mirror group 5 is 50cm, and the distance between the beam splitter 2 and the polarizer 7 is also 50cm. The distance between the beam mirrors 2 is adjusted to 50 cm, so that the optical path difference between the first optical path 3 and the second optical path 4 is 300 cm. The laser generator 1 is triggered, and the laser light with a pulse width of 10 ns emitted by the laser generator 1 is divided into two paths by the beam splitter 2, passing through the first optical path 3 and the second optical path 4 respectively, because the first optical path 3 and the second optical path The optical path difference of 4 is 300cm. When the laser of the first optical path 3 is output by the polarizer 7 for 5 ns, the laser of the second optical path 4 reaches the output of the polarizer 7, and the pulse width becomes 15 ns after the two paths of light are superimposed.

Embodiment 2

[0022] The pulse width of the laser generator 1 is 10ns, the distance between the two mirrors of the mirror group 5 is 50cm, and the distance between the beam splitter 2 and the polarizer 7 is also 50cm. The distance between the beam mirrors 2 is adjusted to 125 cm, so that the optical path difference between the first optical path 3 and the second optical path 4 is 300 cm. The laser generator 1 is triggered, and the laser light with a pulse width of 10 ns emitted by the laser generator 1 is divided into two paths by the beam splitter 2, passing through the first optical path 3 and the second optical path 4 respectively, because the first optical path 3 and the second optical path The optical path difference of 4 is 300cm. When the laser of the first optical path 3 is output by the polarizer 7 for 10 ns, the laser of the second optical path 4 reaches the output of the polarizer 7, and the pulse width becomes 20ns after the two paths of light are superimposed.

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Abstract

The invention discloses a variable pulse width laser device. The variable pulse width laser device comprises a laser generator, a beam splitter, a reflecting mirror group, a translation device and a polarizer, wherein the laser generator, the beam splitter and the polarizer form a first light path; the laser generator, the beam splitter, the reflecting mirror group and the polarizer form a second light path; the reflecting mirror group and the translation device are connected together. Pulse laser emitted by the laser generator is split into two bundles through the beam splitter; the laser of the first light path and the laser of the second light path are laminated together by adjusting the light path length of the second light path, so that the laser pulse width with the change range of 1.5t-2t (t is the original pulse width of the laser generator) is adjusted. The variable pulse width laser device can be applied to the field of laser shock enhancement, the action time of the impact wave can be prolonged, and the laser shock enhancement effect can be improved.

Description

technical field [0001] The invention belongs to the technical field of laser shock strengthening, and in particular relates to a variable pulse width laser. Background technique [0002] Laser shock peening is a new type of material surface strengthening technology, which can obtain a high-amplitude residual compressive stress layer on the surface of metal parts, greatly improving the fatigue life of the part. Compared with conventional shot peening technology, its residual compressive stress layer is deeper; The principle of laser shock is to use pulsed laser to generate plasma explosion with the absorbing layer in a confined state, which can generate a pressure with an intensity of up to several Gigapascals, which propagates to the workpiece through the absorbing layer, and can generate high-amplitude residual compressive stress on the surface of the workpiece. Due to the protective effect of the absorbing layer, the surface of the workpiece will not be burned by heat. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D7/04
Inventor 戴峰泽于璐温德平张永康
Owner JIANGSU UNIV