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利用掺镱大模场面积光子晶体光纤飞秒激光放大器作为抽运源,在高非线性光子晶体光纤中产生了可见光波段增强的超连续光谱。光纤色散曲线经过特殊设计,使得红移孤子波与可见光波段蓝移色散波群速度匹配更好,在光纤中同时传输,并通过四波混频持续发生相互作用,提高了超连续光谱中的可见光成分。实验得到了3.95 W的高功率超连续输出,其中可见光波段占1.2 W。进一步数值模拟表明,增大光纤空气填充率和减小纤芯直径可以增强孤子波与色散波的互作用,使光谱的可见光成分得到进一步增强。
The use of ytterbium-doped large-mode-area photonic crystal fiber femtosecond laser amplifier as a pump source produces a supercontinuum spectrum with enhanced visible band in a highly nonlinear photonic crystal fiber. The fiber dispersion curve is specially designed so that the redshifted soliton wave matches the blue shifted dispersion group in the visible band faster and simultaneously propagates in the fiber and continues to interact through the four-wave mixing to improve the visible light in the supercontinuum spectrum ingredient. Experiments have been 3.95 W high-power supercontinuum output, of which visible light band accounted for 1.2 W. Further numerical simulation shows that increasing the air-filled rate of the fiber and decreasing the core diameter can enhance the interaction between the soliton wave and the dispersive wave so that the visible light component of the spectrum is further enhanced.