Development of Pulsed 1.5 kW Class Average-Output-Power Fiber Laser System Based on Yb-Doped Rod Photonic Crystal Fibers (PCFs) for Beam Combination

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  • ロッド型フォトニック結晶ファイバのビーム結合による パルス動作1.5 kW級高平均出力レーザーの開発
  • ロッドガタ フォトニック ケッショウ ファイバ ノ ビーム ケツゴウ ニ ヨル パルス ドウサ 1.5kWキュウ コウヘイキン シュツリョク レーザー ノ カイハツ

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We have developed high-peak and high-average-power polarization-maintained Yb doped PCF (Photonic Crystal Fiber) rod-fiber laser system. When the main 85 μm-PCF rod amplifier was seeded with 40 W, maximum average output power of over 210 W (pulse width: 10 ns, energy: 0.2 mJ at 1 MHz) and an excellent beam quality M2 of 1.3 was obtained. Total average power at one wavelength (four beams) was obtained to be 700~800 W. In the final fiber laser system designed for material processing applications, three units, each consisting of four coherently combined beams with over 400 W of total power, were constructed. In the final stage, output beams of those three units (1035, 1040 and 1045 nm) were combined by tiled-aperture beam combination technique, delivering more than 1.4 kW average output power at high repetition rates (75 kHz-5 MHz) with few 100 picoseconds to few10 nanoseconds pulse duration.

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