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Ultrashort Pulse Fiber Preamplifier System for Large Core Fiber

A preamplifier and fiber amplification technology, which is applied to lasers, laser devices, laser components, etc., can solve the problems of large structure size and hindering the increase of mode field area

Active Publication Date: 2022-01-14
TRUMPF LASER GMBH CO KG
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  • Summary
  • Abstract
  • Description
  • 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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  • Ultrashort Pulse Fiber Preamplifier System for Large Core Fiber
  • Ultrashort Pulse Fiber Preamplifier System for Large Core Fiber
  • Ultrashort Pulse Fiber Preamplifier System for Large Core Fiber

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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 an oscillator signal (S o ) comprising a fiber preamplification system (5) based on a short fundamental-mode and especially highly doped step-index fiber (5C). Furthermore, the fiber amplification system (2, 2') has a main amplification system (7) and eg at least one further preamplification stage (5A) and a pulse selection unit (5B). The short fundamental mode step-index fiber has a length of less than or equal to 30 cm, a mode field diameter of greater than or equal to 30 μm, for example in the range of 30 μm to 60 μm, and high doping required to provide an absorption length of less than or equal to 30 cm impurity concentration, so that a low non-linear provision of the seed signal for the main amplification system (7) can thus be achieved.

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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Patent Type & Authority Patents(China)
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