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Extra resources for Laser/Optoelektronik in der Technik / Laser/Optoelectronics in Engineering: Vorträge des 7 Internationalen Kongresses / Proceedings of the 7th International Congress Laser 85 Optoelektronik

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Bei der Segmentierung wird die gesamte Lange des Lasermediums in mehrere Entladungsstrecken aufgeteilt, die optisch hintereinander liegen und elektrisch parallel geschaltet sind. h. h. flir ein Rohr mit 3 Elektroden im Abstand von jeweils 35 cm. Die librige elektrische Beschaltung wurde dabei nicht geandert. Die rechte Spalte in Tabelle 2 zeigt, daB mit der segmentierten Anordnung ohne Leistungsverschlechterung der Ubergang zu groBeren Rohrdurchmessern moglich ist: ~1an er- halt eine Laserpulsenergie von ca.

5a shows the configuration of a discharge observed in the cavity when all ridge segments are equidistant to the inside the tube is excited. resonator Only a portion of the gas volume axis. Proper adjustment of the ridge segments results in the discharge shown in Fig. 5b. By this ridge configuration the electric field amplitude is matched to the gas density decreasing in direction of the flow. The decrease of density is caused by heating and friction at the wall of the discharge tube. Fig. 6 shows the laser power as a function of the average UHF pump power having AM frequency of 10 kHz and a duty cycle order annular mode distribution.

CW p = 20mbar He: N2 : CO 2 20 80 : 15 : 5 80 : 15 : 5 SOO INPUT 1500 1000 POWER PUHF °0L---'20~0--W~0~~6~00~~800L--'0~0~O--'2~OO~ INPUT POWER [W J Fig. 6. Output characteristic of the rw J Fig. 7. Comparison of HF- and UHF-excited UHF-excited laser segment (01 P discharge outputs fAM =50kHz Fig. 8. Schwe~e TH-Darmstadt, Institut fUr Angew2ndte Physik Schlossgartenstr. 7, D-6100 Darmstadt 1. Introduction In the field of material processing there is an increassing neeQ for compact high power CO 2 lasers which are pulsable in the 10- or even 100 kHz range.

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