On the possibility of increasing the service life of high-power laser optics through the use of polycrystalline diamond windows with a central monocrystalline area

Rogozhin, M. V.; Rogalin, V. E.; Krymsky, M. I.; Kaplunov, I. A.

doi:10.17804/2410-9908.2018.1.034-040

Cited by 3 publications

(1 citation statement)

References 3 publications

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“…, and Ni for balance) with the particle size ranging between 40 and 160 μm served as the coating material. Low-carbon (0.20 wt% C) steel plate was clad with the powder blend by CO 2 continuous wave laser [5] using a radiation power of 1.4 to 1.6 kW, a speed of 160 to 200 mm/min, a powder consumption of 2.9 to 4.9 g/min, a surface laser spot size of 6×1.5 mm. The powder blend was transported to the cladding zone by an inert gas (argon) at 0.5 atm.…”

Section: Introductionmentioning

confidence: 99%

Eddy-current testing of fatigue degradation in additionally heat-treated gas powder laser clad NiCrBSi coating under contact fatigue loading

Savrai¹,

Makarov²,

Горкунов³

et al. 2018

AIP Conference Proceedings

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The paper studies the applicability of eddy-current technique to testing fatigue degradation in Ni-18.2Cr-3.3B-4.2Si coating, produced by gas powder laser cladding and subjected to additional high-temperature annealing at 1025 °C, under contact loading. It is demonstrated that eddy-current testing of fatigue degradation in Ni-18.2Cr-3.3B-4.2Si coating under contact loading after high-temperature annealing has certain limitations caused by the high brittleness of this coating. In this case, it is possible to test only a sharp increase in the sizes of contact damages, which occurs at 8×10 5 cycles under these loading conditions and results from the formation of a great number of peripheral ring cracks in the fracture zone; the eddy-current readings α decrease due to the increasing electrical resistivity of the coating. Testing can be performed by eddy-current measurements at high excitation frequencies of an eddy-current transducer (f=72-120 kHz), when the effect of the ferromagnetic steel base on the eddy-current readings α is minimum.

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Section: Introductionmentioning

confidence: 99%

Eddy-current testing of fatigue degradation in additionally heat-treated gas powder laser clad NiCrBSi coating under contact fatigue loading

Savrai¹,

Makarov²,

Горкунов³

et al. 2018

AIP Conference Proceedings

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Effect of CO₂-laser power density on the absorption coefficient of polycrystalline CVD diamonds

et al. 2020

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The effect of 1-s irradiation of an uncooled polycrystalline CVD diamond plate by a focused cw CO2 laser beam with a power density of 300 – 800 kW cm−2 is investigated. The absorption coefficient of the sample at a power density of 800 kW cm−2 is found to be 0.035 cm−1 larger as compared with that at 300 kW cm−2, which is related to the temperature dependence of its phonon-induced absorption with a change in temperature from 44 to 100 °C. It is shown that polycrystalline diamond, in contrast to other optical materials, does not exhibit nonlinear (avalanche-like) rise in absorption at high CO2-laser power densities, at least up to 800 kW cm−2.

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Combined Windows for High-Power Gas Lasers

2020

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On the possibility of increasing the service life of high-power laser optics through the use of polycrystalline diamond windows with a central monocrystalline area

Cited by 3 publications

References 3 publications

Eddy-current testing of fatigue degradation in additionally heat-treated gas powder laser clad NiCrBSi coating under contact fatigue loading

Eddy-current testing of fatigue degradation in additionally heat-treated gas powder laser clad NiCrBSi coating under contact fatigue loading

Effect of CO₂-laser power density on the absorption coefficient of polycrystalline CVD diamonds

Combined Windows for High-Power Gas Lasers

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On the possibility of increasing the service life of high-power laser optics through the use of polycrystalline diamond windows with a central monocrystalline area

Cited by 3 publications

References 3 publications

Eddy-current testing of fatigue degradation in additionally heat-treated gas powder laser clad NiCrBSi coating under contact fatigue loading

Eddy-current testing of fatigue degradation in additionally heat-treated gas powder laser clad NiCrBSi coating under contact fatigue loading

Effect of CO2-laser power density on the absorption coefficient of polycrystalline CVD diamonds

Combined Windows for High-Power Gas Lasers

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Product

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About

Effect of CO₂-laser power density on the absorption coefficient of polycrystalline CVD diamonds