成果報告書詳細
管理番号20120000000274
タイトル*平成23年度中間年報 高出力多波長複合レーザー加工基盤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2012/6/1
報告書年度2011 - 2011
委託先名国立大学法人大阪大学接合科学研究所
プロジェクト番号P10006
部署名技術開発推進部
和文要約和文要約等以下本編抜粋:
1.研究開発の内容及び成果等
2 レーザー高品位化技術の研究開発
(1)ファイバーレーザーのパルス制御・高性能化技術の開発
1)ファイバーレーザーのパルス制御技術の開発
(技術研究組合次世代レーザー加工技術研究所(古河電気工業株式会社)、
大阪大学接合科学研究所)
平成22年度に引き続き古河電気工業が大阪大学接合科学研究所を拠点としてシードレーザーの特性向上を推進し、大阪大学接合科学研究所がその特性評価を進めた。
英文要約Title: High-power Pulsed Fiber Laser and Processing Technology Project (FY2010-FY2014) FY2011 Annual Report
[2]Development of technologies for the advanced laser; (1) Development of pulse-controllable high-performance fiber laser; 1) Development of technologies for pulse control of fiber laser; We have achieved 10 ns pulse generation with repetition rate of 1 MHz using fiber laser .Optimization of firmware and software of pulse shape control circuit and improvement of characteristics of external modulation and so on were promoted. 2) Development of technologies for fiber laser module; Fiber laser module was developed. In the fiber laser module, output from LMA fiber was amplified with a photonic crystal fiber (PCF). We have evaluated the developed fiber laser module with evaluation system of the laser performance. 3) Technology development for high-power fiber laser. A polarization-maintained LMA-PCF fiber was used as pre-amplifier. The energy extraction (final goal: 150 W) from the main amplifier was tested with 100-ns long pulse to demonstrate 180 W average power. When the pulse duration was reduced to 9.6 ns, an average output power of 132 W (pulse energy: 0.6mJ, repetition rate: 167 kHz) was obtained. (2) Development of the amplifying technologies of pulse laser; 1) Development of kilo-watt booster amplifier; Pumping optics, cooling mechanics, and input and output optics of a test amplifier were improved. Design of a kW class amplifier was also performed by using a data base of the test amplifier. A commercial simulation code (Scryu/Tetra) for thermal-hydrodymanic analysis and home-made simulation code (TEHSLAC) for ray-tracing were combined to analyze the beam propagation in the test module of the booster amplifier. The results were compared to the experimental data for optimization of the booster amplifier. 2) Development of the amplifier technologies of annealing laser; Development of an oscillator and pre-amplifiers of the annealing laser was finished. (3) Development of the harmonic generation technologies of high power laser; 1) Development of the technologies for harmonic generation module; [The harmonic generation module for annealing laser]; Design of the nonlinear crystals for the harmonic module was finished. For the precise temperature control of the nonlinear crystals, design of a crystal holder and mechanical parts have been started. [The harmonic generation module for fiber laser]; The harmonic generation module was designed and developed with optimized harmonic generation device and temperature control unit. 2) Technology development for efficient harmonic generation; Properties on frequency conversion for thin disk crystals were examined. Nonlinear crystals fabricated by several manufacturers were evaluated on conversion efficiency and thermal effects. 3) Equipment for testing CFRP cutting Duty ratio of an existing laser system was increased to 50% from 30%. Preparation for the processing experiments of CFRP was carried out. The processing experiments of CFRP were performed in cooperation with the ALPROT.
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