Laser/Optoelektronik in der Technik / Laser/Optoelectronics by J. Hamisch, R. Macdonald, U. Müler, J. Yu (auth.), Dr. rer.

By J. Hamisch, R. Macdonald, U. Müler, J. Yu (auth.), Dr. rer. nat. Wilhelm Waidelich (eds.)

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Extra info for Laser/Optoelektronik in der Technik / Laser/Optoelectronics in Engineering: Vorträge des 8. Internationalen Kongresses / Proceedings of the 8th International Congress Laser 87 Optoelektronik

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Endoh, Rev. Sci. Instrum. 57, 2970 (1986) P. Klopotek, U. Brinkmann, D. Basting, W. MUckenheim, CLEO '87, Baltimore, Digest of Technical Papers p. 326 (1987) B. Burghardt, W. MUckenheim, D. Basting, A pulsed single-mode dye laser, Eighth International Conference On Laser Spectroscopy - EICOLS '87, Are, Sweden, June 22-26 (1987) R. Poprawe, Metal'lbearbeitung mit UV-Lasern, BMFT-Bericht 13 N 5167 (1985) B. -J. Cirkel, R. Baumgartl, W. Bette, D. Friede, R. Muller Kraftwerk Union AG, Hammerbacherstr.

Principle constraints of long-pulse operation The essential point f9r discharge-excited excimer lasers is to maintain a homogeneous electrical discharge in a mixture of noble gases with a dilute halogen component. Caused by the high peak current (some 10 kA) and the presence of halogen, the discharge tends to become unstable after a few 10 ns, thereby terminating any further laser action. , if a fast electron avalanche phase is followed by a very moderate discharge. (a) Avalanche phase: The preionization, which is requisite for discharge-excited 13 excimer lasers, leads to an electron density of about 10 7 cm- 3, being far too low for a lasing plasma.

Odenspriige nicht hysteresefrei / 2 /. Das Ziel der vorliegenden Arbeit besteht darin, eine sprung- und hysteresefreie Frequenz der Laserdiode trotz Xnderung des stromes zu stabilisieren. Die emittierte Frequenz eines longitudinalen Mode der FabryPerot-Modenzahl mist abhangig von den Diodenparametern Strom i und Temperatur der Diodenwarmesenke TWS: (1) Differenziert man GI. (1), so ergibt sich: (2) Setzt man in GI. h. Vm konstant, (3) :~obei ~LD der stabilisierungsfaktor ist. 37 Eine aus Stromquelle und Temperaturregler bestehende Diodenversorgungseinheit wurde aufgebaut.

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