Thermal action of high-power laser radiation on the surface of a solid

Аполлонов, В. В.; Barchukov, A. I.; Karlov, N. V.; Prokhorov, A M; Shefter, É. M.

doi:10.1070/qe1975v005n02abeh010903

“…The maximum of laser radiation can be estimated by equating V in (13) to the V ad , corresponding to the maximum admissible deformation of the surface, at which additional losses exceed some value fixed for each system Consider the behavior of the maximum intensities доп т д п as functions of the laser pulse duration 0 for an aluminum sample (Figure 12), calculated for the beam with cm at process, which limits the maximum value of the laser intensity, is the elastic deformation of the reflecting surface. With a pulse duration less than this, the transition of the material to the inelastic region becomes crucial, which is due the stresses (caused by irradiation) above its yield strength.…”

Section: Surface Deformationmentioning

confidence: 99%

High-power optics and its new manifestations

2013

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The advent of the laser has placed stringent requirements on the fabrication, performance and quality of optical elements employed within systems for most practical applications. Their high power performance is generally governed by three distinct steps, firstly the absorption of incident optical radiation (governed primarily by various absorption mechanisms); secondly, followed by a temperature increase and response governed primarily by thermal properties and finally the elements thermo-optical and thermomechanical response, e.g., distortion, stress birefringenous fracture, etc. All of which needs to be understood in the design as efficient, compact, reliable and useful for many applications high power systems, under a variety of operating conditions, pulsed and continuous wave, rep-rated or burst mode of varying duty cycles.

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“…Back in the early 1970s, we drew attention to the phenomenon, which, of course, was to limit the further growth of the power generated by the laser system and, consequently, the intensity of the laser beam on the surface of the irradiated object [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. More than twenty years of fundamental and applied research devoted to the study of this phenomenon and to the solution of problems associated with it allow a conclusion that its essence consists in the following.…”

Section: Optics Of High-power Lasersmentioning

confidence: 99%

“…The maximum of laser radiation can be estimated by equating V in (13) to the V ad , corresponding to the maximum admissible deformation of the surface, at which additional losses exceed some value fixed for each system…”

Section: F  mentioning

confidence: 99%

High power optics and its new manifestations

2013

View full text Add to dashboard Cite

The advent of the laser has placed stringent requirements on the fabrication, performance and quality of optical elements employed within systems for most practical applications. Their high power performance is generally governed by three distinct steps, firstly the absorption of incident optical radiation (governed primarily by various absorption mechanisms); secondly, followed by a temperature increase and response governed primarily by thermal properties and finally the elements thermo-optical and thermomechanical response, e.g., distortion, stress birefringenous fracture, etc. All of which needs to be understood in the design as efficient, compact, reliable and useful for many applications high power systems, under a variety of operating conditions, pulsed and continuous wave, rep-rated or burst mode of varying duty cycles

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“…The investigation of the influence of suspended particles on the threshold of plasma generation in the laser radiation field is a trend in laser plasma physics [12][13][14][15][16].…”

Section: Mathematical Modeling Of Plasma Generation In Laser Welding mentioning

confidence: 99%

Mechanism of plasma generation under focused beam effect on metallic surface in laser welding

Голубев

¹

,

Galushkin

²

,

Grishaev

³

et al. 2007

International Conference on Lasers, Applications, and Technologies 2007: High-Power Lasers and Applications

0

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Numerical modeling of the process of thermal ionization associated with the interaction of laser radiation and metal target was performed and the temperature dynamics and the plasma absorptance were obtained. Threshold values of temperature for the appearance of the thermal instability and near-surface optical plasma generation have been derived. The processes in near-surface laser induced plasma in specific conditions of laser welding are under consideration.

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Thermal action of high-power laser radiation on the surface of a solid

Cited by 22 publications

References 1 publication

High-power optics and its new manifestations

High-power optics and its new manifestations

High power optics and its new manifestations

Mechanism of plasma generation under focused beam effect on metallic surface in laser welding

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