標題: High-power noise-like pulse generation using a 1.56-mu m all-fiber laser system
作者: Lin, Shih-Shian
Hwang, Sheng-Kwang
Liu, Jia-Ming
光電系統研究所
Institute of Photonic System
公開日期: 13-Jul-2015
摘要: We demonstrated an all-fiber, high-power noise-like pulse laser system at the 1.56-mu m wavelength. A low-power noise-like pulse train generated by a ring oscillator was amplified using a two-stage amplifier, where the performance of the second-stage amplifier determined the final output power level. The optical intensity in the second-stage amplifier was managed well to avoid not only the excessive spectral broadening induced by nonlinearities but also any damage to the device. On the other hand, the power conversion efficiency of the amplifier was optimized through proper control of its pump wavelength. The pump wavelength determines the pump absorption and therefore the power conversion efficiency of the gain fiber. Through this approach, the average power of the noise-like pulse train was amplified considerably to an output of 13.1 W, resulting in a power conversion efficiency of 36.1% and a pulse energy of 0.85 mu J. To the best of our knowledge, these amplified pulses have the highest average power and pulse energy for noise-like pulses in the 1.56-mu m wavelength region. As a result, the net gain in the cascaded amplifier reached 30 dB. With peak and pedestal widths of 168 fs and 61.3 ps, respectively, for the amplified pulses, the pedestal-to-peak intensity ratio of the autocorrelation trace remains at the value of 0.5 required for truly noise-like pulses. (C) 2015 Optical Society of America
URI: http://dx.doi.org/10.1364/OE.23.018256
http://hdl.handle.net/11536/128328
ISSN: 1094-4087
DOI: 10.1364/OE.23.018256
期刊: OPTICS EXPRESS
Volume: 23
Issue: 14
起始頁: 18256
結束頁: 18268
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