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Sub-nanosecond laser pulse contrast measuring device

A measuring device, laser pulse technology, applied in the direction of the instrument, can solve the problem of limited crystal size, etc., to achieve the effect of widening the starting point of the detection time

Pending Publication Date: 2018-12-21
LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these measurement devices have improved dynamic range, limited by crystal size, they can only measure contrast information in the range of about ten picoseconds in pulse width.

Method used

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  • Sub-nanosecond laser pulse contrast measuring device
  • Sub-nanosecond laser pulse contrast measuring device
  • Sub-nanosecond laser pulse contrast measuring device

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] figure 1 It is a schematic diagram of the optical path of a sub-nanosecond laser pulse contrast measuring device of the present invention; figure 2 It is a schematic diagram of the optical path of the pulse delayer in the present invention, which is figure 1 A side view of the pulse delayer in ; image 3 It is a schematic diagram of the arrangement of single-shot sub-intensity autocorrelation images acquired by the CCD in the present invention; Figure 4 yes image 3 Schematic diagram of single-shot sub-intensity autocorrelation image stitching, the position of the letter in the figure indicates image 3 The start point of the mosaic position of the upper and lower adjacent images. exist Figure 1~Figure 4 Among them, in a kind of sub-nanosecond laser pulse contrast measuring device of the present invention, a beam splitter 1 is arranged on the incident direction of the high-power ultrashort laser pulse square beam, and the incident pulse light is divided into tra...

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Abstract

The invention discloses a sub-nanosecond laser pulse contrast measuring device. In the measuring device, a measured high-power ultra-short laser pulse square light beam is converted into reflected light and transmitted light after passing through a spectroscope, and the reflected light is changed into a series of convergent laser pulse strings with fixed time delay after passing through a pulse delay device; the laser pulse strings and transmission square light beams are simultaneously projected to frequency doubling crystals for frequency conversion so as to form a plurality of self-correlation signals which have the same spacings up and down and fixed time delays between each other after passing through the frequency doubling crystals; and finally, the mixed light passes through an imaging lens to be imaged into a CCD to be collected and processed to obtain the pulse contrast information with sub-nanosecond time recording length. The device is wide in time recording length, low in cost, simple in structure and convenient to adjust.

Description

technical field [0001] The invention belongs to the technical field of ultrashort laser pulse testing, and in particular relates to a subnanosecond laser pulse contrast measuring device. Background technique [0002] Pulse contrast is a key index for the performance and application of high-power ultrashort laser devices. At present, the correlation method is mainly used to measure the contrast of ultrashort laser pulses. The Chinese utility model patent (Patent No.: ZL 200720077677.0) titled "High Power Ultrashort Laser Pulse Contrast Measurement Device" discloses a pulse contrast measurement method for obtaining third-order correlation signals through non-collinear harmonic conversion. The method of multiple transmission and splitting of glass can only obtain the contrast information of several specific time points on the pulse waveform; the Chinese invention patent (patent number: ZL2009 1 0263670.1) named "Single-shot Ultrashort Laser Pulse Contrast Measurement Device" ha...

Claims

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Application Information

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IPC IPC(8): G01J11/00
CPCG01J11/00Y02A90/10
Inventor 夏彦文孙志红董军张波卢宗贵元浩宇刘华傅学军郑奎兴粟敬钦彭志涛
Owner LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS