| Summary: | 碩士 === 國立交通大學 === 照明與能源光電研究所 === 107 === In this study, we use supercontinuum to generate a high-power and ultrafast laser that has a center wavelength near 1060 nm, which is different from that of the seed laser at 1560 nm. To keep the system all-fiber, we use single-mode fibers of different second mode cutoff wavelengths to construct a shortpass filter. As a result, laser pulses that have a center wavelength near 1060 nm are filtered through. We compare the results of noise-like pulses and well-defined pulses: Both kinds of pulses, amplified by an ytterbium-doped fiber amplifier, can reach about 6 W of maximal average output power and have pulse widths about 17 ps. Through this approach, high-power, ultrashort laser pulses of respective center wavelengths at 1560 nm and 1060 nm that have wide industrial applications can be generated in one system, and we find that the noise-like pulses maintain their temporal features better than the well-defined pulses through the processes of amplification, supercontinuum generation, filtering, and further amplification. After that, we pump the 1060 nm pulses into a 7.5 m-long photonic crystal fiber to generate a 1 W supercontinuum source with spectrum covering the range from the visible 610 nm to the infrared beyond 2200 nm.
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