6-kW and 10-kW high-power lamp-pumped MOPA Nd:YAG laser systems

Toshinori Ishida; Takuya Togawa; Hiroyuki Morita; Yoshikazu Suzuki; Keiji Okino; Koro Takenaka; Keiichi Kubota; Kunihiko Washio; Tsuyoshi Yamane

doi:10.1117/12.377066

7 February 2000 6-kW and 10-kW high-power lamp-pumped MOPA Nd:YAG laser systems

Toshinori Ishida, Takuya Togawa, Hiroyuki Morita, Yoshikazu Suzuki, Keiji Okino, Koro Takenaka, Keiichi Kubota, Kunihiko Washio, Tsuyoshi Yamane

Author Affiliations +

Proceedings Volume 3888, High-Power Lasers in Manufacturing; (2000) https://doi.org/10.1117/12.377066
Event: Advanced High-Power Lasers and Applications, 1999, Osaka, Japan

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.

Citation Download Citation

Toshinori Ishida, Takuya Togawa, Hiroyuki Morita, Yoshikazu Suzuki, Keiji Okino, Koro Takenaka, Keiichi Kubota, Kunihiko Washio, and Tsuyoshi Yamane "6-kW and 10-kW high-power lamp-pumped MOPA Nd:YAG laser systems", Proc. SPIE 3888, High-Power Lasers in Manufacturing, (7 February 2000); https://doi.org/10.1117/12.377066

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