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Ultra short pulse fibre pre-amplifier system for large-core fibres

A preamplifier and fiber amplification technology, applied in lasers, laser devices, laser parts and other directions, can solve the problems of hindering the increase of the mode field area, large structure size, etc., to achieve reduced structure size, high seed energy, The effect of efficient continuous load operation

Active Publication Date: 2018-12-21
TRUMPF LASER GMBH CO KG
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, a large mode field diameter leads to the fact that the fiber can no longer be bent strongly, because otherwise the mode profile is deformed by bending and prevents an increase in the mode field area
In the case of PCFs, it is common to use lasers with bend diameters larger than 25 cm, thus resulting in relatively large structural dimensions of such fiber-based UKP laser systems

Method used

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  • Ultra short pulse fibre pre-amplifier system for large-core fibres
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  • Ultra short pulse fibre pre-amplifier system for large-core fibres

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Embodiment Construction

[0023] Aspects described herein are based in part on the recognition that high input power is required for efficient operation of large core fiber based main amplification systems. For this purpose, it is proposed to use high rare-earth doping with a large core diameter (mode field diameter > 30 μm) and fundamentally implemented step-index optical fiber. In addition to the large core of the step-index fiber, ie in addition to the large mode area, the non-linearity can be kept small by the typical application length of the step-index fiber of 30 cm and less.

[0024] exist figure 1 The UKP laser system 1 shown in includes a fiber-optic amplifier system 2 configured as a fiber-optic amplifier chain, which can start from an oscillator unit 3 by means of a fiber-optic preamplifier system 5 and a main amplifier system 7 in very short pulse durations In the case of high pulse peak power.

[0025]The oscillator unit 3 comprises, for example, a ytterbium-doped, fiber-based and mode...

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Abstract

The invention relates to a fibre amplifier system (2, 2') for receiving and amplifying a laser pulse, for example an oscillator signal (SO) of an oscillator unit (3), comprises a fibre pre-amplifier system (5) based on a short, base-mode, in particular highly doped, stepped-index fibre (5C). The fibre amplifier system (2, 2') also has a main amplifier system (7) and, for example, at least one further pre-amplifier stage (5A) and a pulse selection unit (5B). The short, base-mode stepped-index fibre has a length which is less than or equal to 30 cm, and a mode field diameter which is greater than or equal to 30 [mu]m, e.g. a mode field diameter in the range from 30 [mu]m to 60 [mu]m, as well as a high doping concentration which is necessary to make available an absorption length less than orequal to 30 cm and has the purpose of providing a seed signal for the main amplifier system (7) without low linearity.

Description

technical field [0001] The invention relates to an ultrashort pulse (UKP) laser system, especially a UKP laser system based on optical fiber amplification. Background technique [0002] Fundamental mode rare earth doped fibers are used in UKP laser systems for efficient laser generation with excellent beam quality. The power scaling of such laser systems is limited by the propagation of high intensities over long distances in the fiber, which promotes nonlinear effects and can compromise the long-term stability of the laser system. The accumulated nonlinear phase can especially affect the pulse quality of fiber-based laser systems. Therefore, in a multi-stage pulsed UKP fiber laser system, the accumulated nonlinear phase needs to be controlled (especially minimized) in order to avoid as much as possible a negative impact on the pulse quality and to achieve good compressibility. See, for example, the document "High-Power Ultrafast Fiber Laser Systems" von J. Limpert et al.,...

Claims

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Application Information

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IPC IPC(8): H01S3/067H01S3/23
CPCH01S3/06729H01S3/06758H01S3/1603H01S3/0057H01S3/06754H01S3/094011H01S3/1618
Inventor D·祖特尔A·基利A·比德尼茨F·扬森
Owner TRUMPF LASER GMBH CO KG
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