Dynamic beam lasers based on coherent beam combining

Nissenbaum, Asaf; Armon, Nina; Shekel, Eyal

doi:10.1117/12.2608218

Cited by 10 publications

(5 citation statements)

References 7 publications

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“…Output profiles can tailored to the requirements of the application, and do not need to be limited to typical Gaussian or super Gaussian appearances. Beam shaping can be achieved through refractive or diffractive optical elements (ROEs / DOEs) [1], or more complex approaches such as coherent beam combination [2], and multiplane light conversion [3]. ROEs can provide beam shaping solutions with high transmission and shaping efficiency in a single optical element, without the need for bulky or complex systems.…”

Section: Introductionmentioning

confidence: 99%

Breaking symmetry constraints in freeform design for refractive beam shapers

Griffiths,

CCS,

Trela-McDonald

2023

International Optical Design Conference 2023

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Section: Introductionmentioning

confidence: 99%

Breaking symmetry constraints in freeform design for refractive beam shapers

Griffiths,

CCS,

Trela-McDonald

2023

International Optical Design Conference 2023

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“…[1][2][3][4][5] Typical laser powers are normally limited to several tens of kilowatts. The advent of lasers with a continuous wave (cw) power of 100 kW [6][7][8] in the past decade has facilitated a new level of available laser powers. The reported data on laser-matter interaction in this power level is still rare.…”

Section: Introductionmentioning

confidence: 99%

Laser penetration of metal targets with high powers of up to 120 kW

Reich,

Goesmann,

Lueck

et al. 2023

High Power Lasers: Technology and Systems, Platforms, Effects VI

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Since high-power fiber lasers are emerging in the field of directed energy, the fundamental interaction of these lasers with target materials has to be investigated. For this purpose, experiments with short propagation distances can be performed. The aspects of high-power propagation through the atmosphere over large distances are excluded and go beyond the scope of this work. We show experimental results of laser-matter interaction with up to 120 kW continuous wave laser power. The targets are 10 mm thick plates of aluminum and steel as representative materials commonly used for construction purposes. A decreasing perforation time is observed with increasing laser power. For low powers, the aluminum samples show a much higher perforation time compared to the steel samples. This changes at roughly 80 kW. Above this value the steel samples withstand the laser irradiation longer. This behavior can be attributed to the much higher thermal conductivity of aluminum compared to steel. The change of dominant effects from low to high laser powers is discussed. One further important aspect is the effective energy coupling into the sample. This is investigated by finite element simulations with an adjustable absorptivity. For the steel samples a high absorption rate of around 75 % is observed at low laser powers, which drops down to roughly 15 % at the highest laser powers. For the aluminum samples, on the other hand, an almost constant value of around 15 % is observed.

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“…With the advent of high-power lasers with power levels in the range of 100 kW in continuous wave operation [3][4][5] , the question arises whether the knowledge of laser-matter interaction gained with lasers of a few tens of kilowatts power is still valid at such high power levels. So far, only results on laser welding with such high laser powers have been reported 4,39,40 . The high power available allowed welding depths of 70 mm for single-side welding and up to 125 mm for double-side welding 3,40 .…”

Section: Introductionmentioning

confidence: 99%

“…Continuous wave (cw) laser systems in the power range of 100 kW have been available for more than 10 years [1][2][3][4][5] . Such high laser powers cannot be achieved by a single laser.…”

Section: Introductionmentioning

confidence: 99%

Change of dominant material properties in laserperforation process with high-energy lasers up to 120kilowatt

Reich,

Goesmann,

Heunoske

et al. 2023

Preprint

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In laser materials processing, energy losses due to reflection, heat conduction and thermal radiation play an important role. In this publication, we show that with increasing laser intensity, the energy lost within the sample becomes less important for metal perforation processes. We compare the laser-matter interaction of aluminium and steel plates. Material parameters such as density, melting point and especially thermal conductivity differ strongly, leading to much longer perforation times for aluminium in comparison to steel at laser powers of 20 kW. However, this behaviour changes at laser powers of more than 80 kW where the perforation times of aluminium become shorter than the corresponding times for steel. By comparing experimental data and simulations, we conclude that thermal conduction is the dominant factor of energy loss at low powers, but is reduced at high laser powers.

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Dynamic beam lasers based on coherent beam combining

Cited by 10 publications

References 7 publications

Breaking symmetry constraints in freeform design for refractive beam shapers

Breaking symmetry constraints in freeform design for refractive beam shapers

Laser penetration of metal targets with high powers of up to 120 kW

Change of dominant material properties in laserperforation process with high-energy lasers up to 120kilowatt

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