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Studying of a degree of homogeneity of a temperature field in a water cooled window from the PAS

Allocations of fields of temperatures in a water cooled window at various levels of the influencing radiation, gained with the help teplovizionnogo device Vario Sash, are presented to series of drawings 7.19.

The size of pixel 1,2 h 1,2 mm. The values of temperatures given in drawings, are gained by calibration on the basis of reference datas about radiating ability of the used materials [411]. The device Software in this case allowed to count and display medial value of temperature (T) on pixel. Values of an absorption constant β, given in table 7.4, were calculated under the formula (7.2).

Drawing 7.19 - Allocation of a field of temperatures in the PAS disk.

The size of pixel 1,2? 1,2 mm. The medial temperature (T) on pixel - irradiated зона0 4 mm is specified: 8,1 kw, 1с; 8,1 kw, 5 with; 9 kw, 1 with

- The irradiated band of 0 0,4 mm: 8,1 kw, 1с; 8,1 kw, 5 with; 9 kw, 1 with

In drawing 7.20 influence of power of laser radiation on the peak temperature of a warming up of a diamond window, as at centre - Tmax, and apart 3 mm from it-T1 is shown, at bands of action of 0,4 and 4 mm.

Drawing 7.20 - Dependence of the peak temperature of a warming up of a diamond window

T from power of radiation P in a stain with diameters 4 mm and 0,4 mm.

Tma  - a warming up at centre. T1 - the Warming up in 3 mm from centre

Efficiency of the heat removal immersed in a disk of the PAS, depends on a diamond thermal conduction (for the given sample to = 1960 yo 160 Vt/mK), a temperature lapse rate in a plate, and also diameter of the irradiated band. It is visible, that at the expense of extremely high thermal conduction of polycrystalline diamond, begins possible to reduce diameter of radiation, incrementing a power density. C power density growth the lapse rate of temperature from centre to edge increases. However, at small stains the action band has not time to be cooled and its temperature non-linearly accrues with magnification of intensity of radiation that is well visible on diagrammes (drawing 7.20). At the same time at a stain of 4 mm dependence of temperature of a heating on power of the laser at centre of the irradiated band in the explored gamut has the linear character.

The hot point observed on a casing within the second ring (drawing 7.19), can be explained a patch of light, caused by radiation rereflection in a protective window of an objective of the laser.

At carrying out of experiment to a plate №2 at diameter of an irradiated band of 0,4 mm and powers of radiation of 9 kw there was an optical disruption and fracture of the sample

From polycrystalline diamond (drawing 7.21). The Power density in this case made ~ 7,2 МВт/см2.

Drawing 7.21 - Optical disruption of a disk of the PAS in a cooled casing

1 - a photo of a disk after action; 2 - a microphoto of the centre of a disruption

Drawing 7.22 - Allocation of intensity of laser radiation at diameter of a stain of 0,4 mm

At recording of quality of the past through the PAS of a beam, appreciable changes in allocation of intensity of laser radiation before passage through a water cooled plate it was revealed not. Therefore a series of experiments with the under rate of flux of water has been spent - 2l/minute In drawing 7.22 deterioration of parametres of laser radiation is qualitatively shown at the nonuniform cooling of a window with the under rate of flux of water. Diameter of radiation on a plate made 0,4 mm.

7.4

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A source: Rogalin Vladimir Efimovich. Firmness of materials of power optics to action of powerful impulses of radiation CO2 - lasers. The dissertation on competition of a scientific degree of the doctor of physical and mathematical sciences. Tver - 2015. 2015

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