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Erbium Fiber Oscillator With an Intracavity Pulse Shaper for High-Energy Low-Pedestal Wavelength-Tunable Femtosecond Pulse Generation

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6 Author(s)
Hung-Wen Chen ; Inst. of Photonics Technol., Nat. Tsing Hua Univ., Hsinchu, Taiwan ; Chia-Lun Tsai ; Li-Fan Yang ; Ming-Hsien Lin
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An erbium fiber oscillator with dominating gain fiber length and an intracavity pulse shaper is experimentally demonstrated. The Kerr nonlinear phase shift induced in the fibers is suppressed by the pulse shaper, enabling high-energy (8.9 nJ) high-compression efficiency (93%) pulses of less than 270 fs duration (after linear dechirping) at modest (320 mW) pump power. A stably mode-locked spectrum corresponding to 19 nJ, 83 fs transform-limited pulse is achieved at 720 mW pump power. Wave-breaking-free pulse energy can be further enhanced by introducing stronger spectral phase modulation via the pulse shaper if more pump budget is available. We also demonstrate manipulation of the central wavelength and bandwidth of the output pulse by intracavity spectral amplitude modulation via the pulse shaper.

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Lightwave Technology, Journal of  (Volume:32 ,  Issue: 19 )