Apparatus and method for transmitting pulsed laser radiation with hollow-core fiber
A technology of pulsed laser and hollow-core fiber, applied in laser welding equipment, laser optical equipment, laser, etc., can solve the problem of weakening the coupling input efficiency
Pending Publication Date: 2022-05-27
TRUMPF LASER GMBH CO KG
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As such, misalignment of the incoupling lens relative to the lightguide region can impair incoupling efficiency
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[0060] Figure 1A The use of hollow core fiber 1 (transmission fiber) to transmit high-power laser pulses 3A is illustrated. The high power laser pulses 3A are generated by the laser pulse source 3 and each have an initial pulse duration Δt. The high power laser pulse 3A is focused onto the first fiber end 1A of the hollow core fiber 1 by means of a fiber coupling-in device comprising a lens 5A. In particular, the beam profile of the high power laser pulse 3A overlaps the hollow core 4A of the hollow core fiber 1 so that only a small intensity part of the beam profile overlaps the material 4B of the hollow core fiber 1 surrounding the hollow core 4A. In the case of an ideal coupling-in (that is, where there is minimal overlap of the beam profile with the material), for fixed beam parameters, the maximum intensity I_max represents the damage threshold for the fiber type (see also Figure 4 ).
[0061] If, for intensities below the maximum intensity I_max, the beam path parame...
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A device (11) for transmitting pulsed laser radiation having a pulse energy that results in a high intensity laser pulse (3C) with a compressed pulse duration comprises a pulse duration setting device (13), a hollow-core optical fiber (1) and an optical fiber coupling-in device (17). The pulse duration setting device is designed to receive the pulsed laser radiation and to set a transmission pulse duration ([Delta] tt) of the laser radiation. The invention relates to a hollow fiber (1) having a hollow core (4A) surrounded by a material (4B), the hollow fiber (1) transmitting a laser pulse (3B) coupled at a first fiber end (1A) in the hollow core (4A) to a second fiber end (1B) and outputting the laser pulse at the second fiber end. According to the invention, the hollow fiber (1) is operated with a beam profile parameter value (X, alpha) present at the first fiber end (1A), said beam profile parameter value lying within a target tolerance range ([delta] XS). The fiber coupling device is designed to receive the laser radiation set for the transmission pulse duration ([Delta] tt) and to couple the laser radiation into the hollow fiber (1) with a beam profile parameter value (X, [Alpha]), which lies within the target tolerance range ([Delta] XS), and is characterized in that the fiber coupling device is designed to receive the laser radiation set for the transmission pulse duration ([Delta] tt) and to couple the laser radiation into the hollow fiber (1) with a beam profile parameter value (X, [Alpha]), which is within the target tolerance range ([Delta] XS). According to the invention, the transmission pulse duration ([delta] tt) is set in such a way that, for all beam profile parameter values (X, alpha) within the target tolerance range ([delta] XS), a coupling input of the laser radiation into the hollow core (4A) is given in the case of which the material and / or structure (37) of the hollow fiber (1) is retained.
Description
technical field [0001] The present invention relates to a device for transmitting high-power laser pulses with hollow-core fibers. Furthermore, the present invention relates to a method for transmitting high power laser pulses with hollow core fibers. Background technique [0002] In conventional fibers such as step index solid core fibers, the guidance of the laser radiation may be affected by possible interactions of the laser light with the fiber material. In particular, the damage to the fiber material caused by this interaction limits the maximum transmittable pulse energy and pulse power, so that solid cores cannot be used in the case of high-intensity laser radiation, especially in the case of high-power laser pulses optical fiber. High-power laser pulses are understood herein as so-called ultrashort pulses, which have a pulse duration in the range of a few femtoseconds (fs) to several hundreds of picoseconds (ps) and have a pulse duration in the microjoule (μJ) Pu...
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IPC IPC(8): G02B6/42G02B6/032G02B6/02G02B6/32H01S3/00
CPCG02B6/4296G02B6/032G02B6/02328G02B6/02347G02B6/02304G02B6/32G02B6/02323H01S3/005H01S3/0057B23K26/0624G02B6/4206
Inventor A·布德尼基S·鲍姆巴赫
Owner TRUMPF LASER GMBH CO KG