Self-filtering resonator of a cw CO<sub>2</sub>laser

Ivanchenko, A. I.; Krasheninnikov, V. V.; Ponomarenko, A. G.; Shchulyat'ev, V B

doi:10.1070/qe1989v019n02abeh007802

Sov. J. Quantum Electron.

1989

DOI: 10.1070/qe1989v019n02abeh007802

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Self-filtering resonator of a cw CO₂laser

A. I. Ivanchenko¹,

V. V. Krasheninnikov²,

A. G. Ponomarenko³

et al.

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“…To resolve this contradiction, Gobbi and Reali [5] proposed to use a self-filtered unstable resonator (SFUR) in the industrial CO 2 -laser. By using such a resonator, the authors of [6][7][8] managed to obtain a laser power higher than that in a laser with a single-mode (TEM 00 ) resonator of the same length and to retain the beam quality corresponding to a laser with a single-mode resonator.…”

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confidence: 98%

“…To improve the cutting technology, we used an automated industrial laser system developed at the Khristianovich Institute of Theoretical and Applied Mechanics of the Siberian Division of the Russian Academy of Sciences on the basis of a continuous CO 2 -laser with a power up to 8 kW [9][10][11]. The laser includes a multipass self-filtered resonator capable of providing high-power radiation with a diverging factor close to the diffraction value [6][7][8].…”

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Specific features of laser cutting of steel sheets and monitoring of sample quality after laser influence

Данилов

Зуев

Кузнецова

et al. 2006

J Appl Mech Tech Phys

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An automated laser system with an 8-kW quantum generator with the beam quality not worse than that of a single-mode laser is described. The possibility of using such a system in procurement production for cutting carbon and stainless steel sheets is demonstrated. The quality control of the blank material shows that the properties of the latter satisfy appropriate standards.Key words: industrial gas lasers, self-filtered resonators, gas-laser cutting of metal sheets, technological parameters, structure and properties of blanks.Introduction. Among laser technologies currently used in machine-building branches of industry, gaslaser cutting of metal and nonmetal materials has found the widest application [1-3]. The use of laser cutting in procurement production turned out to be most effective [1]. A wide range of thicknesses and grades of materials being cut and almost arbitrary parameters of blanks being cut allow manufacturing blanks of various types, sizes, and geometry.The main advantages of laser cutting are as follows: -improvement of processing quality owing to the minimum area of thermal influence, reduction of heatinduced strains, absence of the force action on the article; -higher processing rate (severalfold higher than that in conventional methods of mechanical treatment); -severalfold reduction of time needed for the preparatory stage of production in the case new articles are to be produced; -higher material utilization rate owing to the use of optimal cutting patterns; -high quality of cutting of structural steels, which often allows butt welding without prior mechanical treatment;-no displacements of the cut edges; -possibility of producing articles with notches in the form of acute angles, junctions without radii, and thin bridge connections (less than 1-2 mm thick), as well as small-diameter orifices (in contrast to die-cutting by universal circular tools).Using the laser-cutting technology, one can cut sheeted materials over a complicated contour with accuracy ranging from 100 to several micrometers.Advanced laser cutting systems allow cutting thin-sheeted materials with a velocity up to 120 m/min with an error smaller than 100 µm. To reach a maximum possible thickness of sheets being cut and a maximum possible cutting velocity, the laser power should be increased; therefore, the technology of laser cutting with a power of 5 to 6 kW has been recently conquered in industry.

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mentioning

confidence: 98%

mentioning

confidence: 99%

Specific features of laser cutting of steel sheets and monitoring of sample quality after laser influence

Данилов

Зуев

Кузнецова

et al. 2006

J Appl Mech Tech Phys

View full text Add to dashboard Cite

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Unstable resonator with spatial filtering of radiation in an industrial CO₂-laser

Grachev¹,

Ivanchenko²,

Смирнов³

et al. 1991

Sov. J. Quantum Electron.

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A study has been made of the electrokinetic charging of polymers during capillary extrusion. The levels of charge in the extruded polymer are significant ( w 10-4 C m-3) and depend on the polymer impurity, capillary material, and on the temperature and rate of extrusion. The charging is believed to be due to the separation of the double layer formed at the capillary/polymer interface, and gives rise to the well-known phenomenon of streaming current. A theory is developed for the streaming current generated by a liquid undergoing laminar flow in short tubes. By replacing the parabolic velocity profile with the more general velocity profile applicable to polymer flow, the theory is extended and satisfactorily explains the experimental results. If the polymer resistivity decreases below 10'0 Q m, the theory requires modification to account for the relaxation of extruded charge back to the capillary. This process leads to the appearance of a maximum in the charging characteristics. From the characteristics an estimate of the polymer resistivity can be made, and this is found to be in reasonable agreement with the low-field DC resistivity of the polymer measured at the temperature of extrusion.

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Self-filtering resonator of a cw CO₂laser

Cited by 2 publications

References 1 publication

Specific features of laser cutting of steel sheets and monitoring of sample quality after laser influence

Specific features of laser cutting of steel sheets and monitoring of sample quality after laser influence

Unstable resonator with spatial filtering of radiation in an industrial CO₂-laser

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Self-filtering resonator of a cw CO2laser

Cited by 2 publications

References 1 publication

Specific features of laser cutting of steel sheets and monitoring of sample quality after laser influence

Specific features of laser cutting of steel sheets and monitoring of sample quality after laser influence

Unstable resonator with spatial filtering of radiation in an industrial CO2-laser

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Self-filtering resonator of a cw CO₂laser

Unstable resonator with spatial filtering of radiation in an industrial CO₂-laser