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Proceedings Paper

6-kW and 10-kW high-power lamp-pumped MOPA Nd:YAG laser systems
Author(s): Toshinori Ishida; Takuya Togawa; Hiroyuki Morita; Yoshikazu Suzuki; Keiji Okino; Koro Takenaka; Keiichi Kubota; Kunihiko Washio; Tsuyoshi Yamane
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Paper Abstract

High power lamp pumped YAG lasers of 6 kW and 10 kW average output power with good beam quality have been developed by using MOPA arrangement with multi-pump cavities for oscillator and amplifiers. For 6 kW laser system, efficient pump cavity for lessening thermally induced beam distortion effects has been designed, which realized output power greater than 700 W and M2 value less than 70. CW 3.5 kW has been realized from 5 cavity laser oscillator and CW 6.7 kW output power has been obtained by adding 5 cavity amplifier to the oscillator. During development, much amount of power of scattered and deformed light surrounding a main laser beam was observed for increased number of amplifiers. By applying spatial apertures between amplifiers, laser output beam quality has been improved to as good as M2 of 73 [beam parameter product (2 (omega) *2 (theta) ) :100 mm (DOT) mrad], enough for fiber (NA 0.15, (phi) 0.6 mm) delivery. Furthermore, 14-rod cavities, 10 kW Nd:YAG laser system, which can generate world-highest output power of 10 kW or more as a solid state laser, have been developed for thick plate processing with 137 mm (DOT) mrad (M2 approximately 101) beam parameter product. This laser system has achieved the transmission to 9 kW or more for (phi) 800 micrometer/NA 0.2 fiber.

Paper Details

Date Published: 7 February 2000
PDF: 9 pages
Proc. SPIE 3888, High-Power Lasers in Manufacturing, (7 February 2000); doi: 10.1117/12.377066
Show Author Affiliations
Toshinori Ishida, NEC Corp. (Japan)
Takuya Togawa, NEC Corp. (Japan)
Hiroyuki Morita, NEC Corp. (Japan)
Yoshikazu Suzuki, NEC Corp. (Japan)
Keiji Okino, NEC Corp. (Japan)
Koro Takenaka, NEC Corp. (Japan)
Keiichi Kubota, NEC Corp. (Japan)
Kunihiko Washio, NEC Corp. (Japan)
Tsuyoshi Yamane, NEC Corp. (Japan)

Published in SPIE Proceedings Vol. 3888:
High-Power Lasers in Manufacturing
Xiangli Chen; Tomoo Fujioka; Akira Matsunawa, Editor(s)

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