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Measuring device and measuring method for large diameter ultrashort laser pulse front edge radial group delay

A pulse front, ultra-short laser technology, applied in instruments and other directions, to achieve the effect of reducing size, increasing measurable diameter, and saving costs

Active Publication Date: 2016-06-15
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Application Information

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Problems solved by technology

This method overcomes the limitations of the existing measurement methods due to the ideal reference light and the required large-scale optical components, and realizes the direct measurement of the radial group delay of large-aperture ultrashort pulses in high peak power laser systems

Method used

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  • Measuring device and measuring method for large diameter ultrashort laser pulse front edge radial group delay
  • Measuring device and measuring method for large diameter ultrashort laser pulse front edge radial group delay
  • Measuring device and measuring method for large diameter ultrashort laser pulse front edge radial group delay

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Embodiment Construction

[0040] The present invention will be further described below in conjunction with the accompanying drawings.

[0041] Such as figure 1As shown, a measuring device for radial group delay at the leading edge of a large-aperture ultrashort laser pulse includes: a Michelson interferometer, a second-order autocorrelator 14 , and an oscilloscope 15 . Wherein the Michelson interferometer includes two arms, one arm consists of a first reflector 1, a delay line 6 and a fifth reflector 5; the other arm consists of a second reflector 2, a third reflector 3, a fourth reflector mirror 4; The device also includes a near-field diaphragm 8 and a far-field optical path for beam combining optical path correction. The far-field optical path is sequentially composed of the sixth mirror 9, the seventh mirror 10, the telephoto lens 12, the eighth mirror 11 and the CCD 13, wherein the sixth mirror 9 is arranged on the translation stage.

[0042] The large-aperture pulse to be measured is divided i...

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Abstract

The invention discloses a measuring device and measuring method for large diameter ultrashort laser pulse front edge radial group delay. The device comprises a Michelson's interferometer and a second order auto-correlator which are arranged at a pulse output end; an oscilloscope, a near field diaphragm and a far field light path which is used for correcting combined beam light path. By use of the device and method, the size of optical elements required by a measuring device is greatly decreased; no extra ideal reference light is required to be introduced or no extra optical element is required to be introduced to produce ideal reference light; direct measurement of front edge radial group delay of large diameter ultrashort laser pulse output by a laser system of high peak power is achieved for the first time; the device and method are convenient to adjust, easy and efficient and have high practicality.

Description

technical field [0001] The invention is a device and method for measuring the front radial group delay of a large-aperture ultra-short laser pulse introduced by a series of transmission beam expanders in an ultra-intense ultra-short laser system based on self-referencing and second-order cross-correlation technology. Background technique [0002] The interaction between ultra-intense and ultra-short laser pulses and matter is a strong field process. The far-field focusing intensity of the pulse directly determines the interaction effect between the laser and matter, and the radial group delay at the pulse front is a crucial parameter affecting the focusing intensity. . Therefore, it is of great significance to simply and accurately measure the radial group delay of ultrashort and ultraintense laser pulses and make a reference for its compensation. [0003] In order to avoid nonlinear effects and optical damage, high peak power laser systems must be accompanied by large-aper...

Claims

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Application Information

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IPC IPC(8): G01J11/00
CPCG01J11/00
Inventor 吴分翔许毅李朝阳冷雨欣
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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