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High-order quasi-phase matching cross-correlation-based single signal-to-noise ratio measurement method and device thereof

A single-measurement, cross-correlation technique applied in the laser field to achieve high-resolution results

Active Publication Date: 2012-12-26
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method and device for single-time measurement of signal-to-noise ratio that can realize large window, high resolution and high fidelity at the same time, aiming at the deficiency of single-time measurement of signal-to-noise ratio, especially the correlation process.
The present invention introduces high-order quasi-phase-matching (QPM) technology into the single measurement of signal-to-noise ratio for the first time, solves various existing problems, and realizes large window, high resolution and high fidelity at the same time Measurement

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  • High-order quasi-phase matching cross-correlation-based single signal-to-noise ratio measurement method and device thereof
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  • High-order quasi-phase matching cross-correlation-based single signal-to-noise ratio measurement method and device thereof

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Embodiment 1

[0027] figure 1 (a) A novel crystal design based on high-order quasi-phase matching (QPM), on a large lithium niobate substrate (length L 1 +L 2 ) only polarizes part of it (length L 1 ), the rest is not polarized (length L 2 ). The period of the polarization region is Λ, and the corresponding lattice vector is , m is an odd number ≥3.

[0028] Taking the measurement of 1054nm neodymium glass laser as an example, the sampling light is its frequency doubled light of 527nm. The 1054nm laser light 1 emitted by the neodymium glass laser is split into two beams by the beam splitter 2 . One beam, as the beam 3 to be measured, passes through the periscope 10 in order to be polarized, the second reflector 11, the third reflector 12, and the first beam expander 13 (expanding the beam to be equivalent to the width of the crystal), and vertically by the cylindrical concave mirror 14 Focus directly onto the 25-wide end facet of the crystal. Another bundle of 4 pump frequency mult...

Embodiment 2

[0031] figure 1 (b) is another novel configuration based on higher-order QPM. Taking the measurement of 800nm ​​Ti:sapphire laser as an example, using 3.4μm long-wavelength sampling light, the corresponding prototype experimental device is as follows: 800nm ​​laser 1 emitted by Ti:sapphire laser is divided into two beams by beam splitter 2. One beam, as the beam 3 to be measured, passes through the periscope 10 in order to be polarized, the second reflector 11, the third reflector 12, and the first beam expander 13 (expanding the beam to be equivalent to the width of the crystal), and vertically by the cylindrical concave mirror 14 Focus directly onto the 25-wide end facet of the crystal. Another beam of 4 pumps mid-infrared light parametric amplifier 5 to generate 3.4 μm long-wavelength sampling light 6 , passes through first mirror 7 and time delay line 8 , and is focused by concave mirror 9 onto the narrow end surface of crystal 15 . The sum-frequency cross-correlation be...

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Abstract

The invention belongs to the technical field of laser, in particular to a high-order quasi-phase matching cross-correlation-based single signal-to-noise ratio measurement method and a device thereof. The introduction of high-order quasi-phase matching perfectly solves the problem that in the conventional measurement method, measurement window, resolution and fidelity cannot be simultaneously met. On the basis of the high-order quasi-phase matching principle, the inventors design two types of cross-correlation configurations: ipsilateral cross-correlation and lateral cross-correlation. Both types of measurement configurations can realize large-window, high-resolution and high-fidelity measurement.

Description

technical field [0001] The invention belongs to the field of laser technology, in particular to a method and device for single-time measurement of signal-to-noise ratio based on high-order phase matching and cross-correlation. Background technique [0002] In the field of intense laser-matter interactions, the pulse signal-to-noise ratio is a major concern. If the intensity of the leading edge pulse or background is as high as 10 10 W / cm 2 , then they interact with the matter before the main laser pulse arrives, thereby changing the physical properties of the matter target. In view of this, the measurement of signal-to-noise ratio is particularly important. Since the current high-intensity laser systems generally work at low repetition rate, or even no repetition rate (that is, single shot), a technology is needed to measure the pulse signal-to-noise ratio in real time, so as to facilitate the optimization of the laser system and the improvement of the signal-to-noise ra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J11/00
Inventor 钱列加马金贵王永志袁鹏谢国强朱鹤元
Owner FUDAN UNIV