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System for spatial recombination of ultrashort laser pulses by means of a diffractive element

A diffractive optical element, space technology, applied in lasers, electrical components, optical components, etc., can solve the problem of not being able to be applied as it is, and achieve the effect of optimizing the combined efficiency

Active Publication Date: 2017-05-10
THALES SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, this technique cannot be applied as-is in the ultrashort pulse mode

Method used

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  • System for spatial recombination of ultrashort laser pulses by means of a diffractive element
  • System for spatial recombination of ultrashort laser pulses by means of a diffractive element
  • System for spatial recombination of ultrashort laser pulses by means of a diffractive element

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Embodiment Construction

[0036] There are two difficulties in setting up a recombination system with a DOE as shown in Figure 2 when the system is designed to recombine a pulsed laser source with a pulse width typically less than 1 picosecond:

[0037] - The first difficulty is related to the spectral width of the pulse (usually around, for Δt ~ 100.10 -15 s, Δλ=10 nm). The diffractive element 1 is set and manufactured for a given operating wavelength. However, a spectral width of about 10 nm does not seriously affect the efficiency of the DOE's recombination (typically, the loss of efficiency is a few percent for a spectral width of 10 nm). On the other hand, the angular dispersion δθ of the DOE 0 more problematic (the blue component of the pulse's spectrum will leave the DOE at a different angle than the red component, as in Figure 2a shown).

[0038] This effect, on the one hand, is detrimental to the spatial quality of the recombined beam by increasing the divergence of the recombined beam an...

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Abstract

The invention relates to a system based on recombination by superposition using a diffractive optical element DOE (1) for combining the beams. According to the invention, a diffractive optical assembly (21) is disposed upstream of this diffractive optical element in order to enable combination efficiency at ultrashort pulse speed to be optimized by means of an appropriate imaging system.

Description

technical field [0001] The field of the invention is that of coherent recombination of a large number of ultrashort pulsed laser sources (ie pulse widths less than 1 picosecond). The architecture of the present invention involves spatial recombination techniques for these laser pulses, which are assumed to be otherwise perfectly synchronized. Background technique [0002] The coherent recombination of ultrashort pulse laser sources is especially applied to the realization of high energy laser sources. [0003] Methods for spatially recombining coherent beams fall into two categories, depending on the choice to collocate beams in the far field or to superimpose beams in the near field (ie, at the level of the exit pupil of the system). [0004] Figure 1a The system used for recombination by juxtaposition is shown in . In this case, from the laser source F k The resulting beams to be recombined (k varying from 0 to N) are parallel and collimated in the near field by the co...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/10
CPCG02B27/1086H01S3/0826H01S3/2383H01S3/005H01S3/23H01S3/08009H01S3/10
Inventor J·布尔德里奥内A·布里尼翁
Owner THALES SA