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跨倍频程超连续光谱的产生是光学频率梳系统中测量载波包络相移频率的关键.本文采用拉锥单模光纤作为非线性光谱展宽介质,将半导体激光(LD)抽运的掺镱硼酸钙氧钇(Yb:YCOB)振荡器输出的飞秒激光耦合到该拉锥光纤中,通过飞秒激光在光纤中发生的相位调制、四波混频等非线性效应将光谱展宽至超过倍频程的范围.振荡器输出的飞秒激光脉冲宽度为130 fs,中心波长为1052 nm,重复频率为76.8 MHz,平均功率为620 m W,耦合进单模拉锥光纤后获得了光谱覆盖范围从550 nm至1350 nm的跨倍频程超连续光谱,最大输出平均功率为323 m W,耦合效率达到52%.为进一步实现全固态飞秒激光光学频率梳提供了重要基础.
The production of supercontinuum at double octave is the key to measuring the phase shift frequency of carrier envelope in optical frequency comb system.In this paper, single-mode fiber as a non-linear spectrum broadening medium is used in the optical frequency comb system, A femtosecond laser output from a calcium borate yttrium (Yb: YCOB) oscillator is coupled into the tapered optical fiber and the spectrum is broadened beyond a factor of two by nonlinear effects such as phase modulation, four-wave mixing, etc., occurring in the fiber by femtosecond laser The frequency range of the oscillator output femtosecond laser pulse width of 130 fs, the center wavelength of 1052 nm, the repetition frequency of 76.8 MHz, the average power of 620 mW, coupled into the single-mode tapered optical fiber obtained spectral coverage From super-octave supercontinuum at 550 nm to 1350 nm, the maximum output average power is 323 mW and the coupling efficiency is up to 52%, which provides an important foundation for further realization of all-solid-state femtosecond laser optical frequency combing.