成果報告書詳細
管理番号20100000001919
タイトル*平成21年度中間年報 エネルギー使用合理化技術戦略的開発/エネルギー有効利用基盤技術先導研究開発/省エネルギーレーザ加工のための高効率ファイバ結合型レーザ光源の研究開発
公開日2010/11/10
報告書年度2009 - 2009
委託先名三菱電機株式会社 株式会社フジクラ
プロジェクト番号P03033
部署名省エネルギー技術開発部
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 (1)研究目的と実施計画 本研究開発では、産業において今後大きな割合を占めると予測される加工用レーザの省エネルギー化を目的として、高効率・高出力・高品質のファイバ結合LD光源を開発し、これを励起源とするファイバレーザを試作する。このために、「(1)高密度ファイバ結合型LD光源の開発」、「(2)高出力ファイバレーザの開発」を実施し、高効率であるとともに、幅広い応用分野に適用可能なビーム品質と信頼性を備えたファイバ結合型レーザ光源の要素技術を開発する。
英文要約Title: Strategic Development of Energy Conservation Technology Project / Preparatory Research Phase (Fundamental Technology Development for Energy Conservation) / Research & Development of Efficient Fiber Coupled Laser Sources for Energy Saving Laser Processing (FY2008-FY2010) FY2009 Annual Report
We carried out 3 research items for the development of efficient fiber coupled laser sources for energy saving laser processing. Consequently, we accomplished interim marks in each research item to achieve final target. (1)Development of High-Intensity Fiber Coupled Laser Diode: (a)Development of Efficient Laser Diode Chip: We have investigated the dependence of slope efficiency on thickness of guide layer and the effect of quantum well structure on laser features. As a result, output power of 84.3 W and electrical efficiency of 60.8% were obtained at 85A injection current. The maximum electrical efficiency of 62.8% was also obtained at 60A injection current. (b)Development of High-Intensity Fiber Coupled LD-Package: Based on beam profile measurement and ray trace simulation, we designed and prototyped a newly-developed optical system to reduce anisotropic beam quality. As a result, we obtained 52.5W φ105μm fiber coupled output power, with electrical efficiency and fiber coupling efficiency of 45% and 74%, respectively. (2)Development of High-Power Fiber Laser: (a)Development of High-Power Fiber Components: We investigated the durability of the pump combiner to the optical power of 500W and found that the overheating was caused by the beam divergence angle of the pumping LD module. We optimized the shape of the taper fiber and adopted a cooling structure so that we achieved the temperature increase of only 50K, even for the pump power of 600W. (b)Trial Manufacturing of High-Power Fiber Laser: We assembled a high-power fiber laser utilizing the result of (a) and double-clad active fibers with single mode core. We realized a fiber laser with an output power of 500W from the total pump power of 1050W by adopting a MOPA configuration. The M-squared value should be less than 1.5 since we utilized single-mode-core fibers. (3)Evaluation of Fiber Coupled Laser Sources: (a)Parametric Study of a High-Power Diode and Fiber lasers: We have investigated performances of a fiber amplifier by using a developed LD module. The energy extraction efficiency of 69% was obtained which was identical with that obtained by using another commercial (German) LD as the pump source. (b)Design Issues of High-Power Pulse Fiber Lasers: We presented the production of high energy nano-second pulses by combining a Q-switched DPSS master laser with a large mode-area (core diameter 50μm) Yb doped fiber amplifier. As a result, we achieved an output power of 23.5W, pulse energy of 2.35mJ, pulse width of 38ns, and a peak power of 62kW. At this stage, we have not observed any significant pulse broadening due to nonlinear effects in the fiber amplifier.
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