成果報告書詳細
管理番号20140000000657
タイトル*平成25年度中間年報 次世代素材等レーザー加工技術開発プロジェクト 次世代レーザー加工技術の研究開発(2)
公開日2014/11/19
報告書年度2013 - 2013
委託先名国立大学法人大阪大学
プロジェクト番号P10006
部署名ロボット・機械システム部
和文要約
英文要約Title : High-power Pulsed Fiber Laser and Processing Technology Project (FY2010-FY2014) FY2013 Annual Report

Research and development item 1 [Development of CFRP processing technology]

(1) Development of technologies for the advanced high power laser;
1) Development of pulse-controllable high-performance fiber laser;
[Entry of nano-sec pulse to solid booster amplifier and beam supply for CFRP processing experiment]
The output pulse of fiber laser system was entered to the booster amplifier in development of kW class booster amplifier. The output characteristics such as the mode stability and beam quality were measured and the solution technique was developed. When the new PCF amplifier was seeded with 30 W, an average output power of over 180 W (pulse width: 10 ns, energy: 0.6 mJ at 300 kHz) was obtained. An excellent beam quality M2 of 1.2 was obtained. The focusing performance in the processing experiment was evaluated.

[Evaluation experiment with 150 W, 10 ns and 75 kHz fiber laser]
Basic experiments of the CFRP cutting using fiber laser with an average output power of 150 W, pulse width of 10 ns and repetition rate of 75 kHz were carried out. The CFRP cutting experiments in various conditions were performed and the elemental data for the development of pulse laser with an average power of 1.5 kW and CFRP processing system with the laser was obtained.

[Development of 150 W and sub-nano sec pulse fiber laser and technology for the laser module and evaluation experiment with the laser system]
Development of pulsed seed laser for the sub-nano sec pulse fiber laser was carried out. When the pulse width was 400 ps, the repetition rate was 1 MHz. Photonic-crystal fiber amplifier was developed for producing the laser with the average output power of 150 W. The basic experiment was performed with the sub-nano sec pulse laser under controlled atmosphere. The heat affected zones after the laser processing with pulse widths in the range of 400 ps and 10 ns were evaluated for avoiding formation of them.

[Development of harmonic conversion technology for 150 W and sub-nano sec pulse fiber laser and evaluation experiment of CFRP processing with the laser system]
The harmonic conversion technology was developed for the sub-nano sec pulse fiber laser with an average output power of the 150 W. The elemental experiments of the CFRP cutting were performed with the pulse fiber laser whose wavelengths were fundamental, second and third harmonic wave, respectively. The heat affected zones after the laser processing with the fundamental, second and third harmonic wave were evaluated for avoiding formation of them.

[Evaluation of subnano-second laser ablation]
We evaluated the cutting surface of CFRP with a fixation unit for element measurement, an energy dispersive X-ray spectrometry unit and a Raman spectroscopy system, respectively. Furthermore, the ablation plume dynamics were examined with a high speed video camera. It was clarified that the cutting quality of CFRP depended on the laser wavelength and pulse width.
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