基于拉锥光纤超连续谱的ceo信号测量

韩海年+张龙+魏志义

摘 要：基于通用的NPE锁模技术建成了掺Yb飞秒光纤激光器，在350 mW、975 nmLD泵浦下输出100 mW的锁模超短脉冲，中心波长为1030 nm，经过腔外压缩后脉宽可以到55 fs。将这样的飞秒光纤激光器作为光学频率梳的核心单元，通过光纤放大、压缩后射入自制的拉锥单模光纤中得到了接近3个光学倍频程的超连续光谱展宽，并且基于这样的光谱测量得到了飞秒脉冲ceo信号。

关键词：拉锥光纤 超连续 ceo信号

Abstract：We demonstrate the generation of carrier envelope offset frequency based on the tapered single-mode fiber supercontinuum spectrum in fs ytterbium fiber comb. A piece of standard single-mode fiber with 9um core diameter at the length of 90 mm was tapered into 3um core diameter in the middle of 10mm length to enhance the nonlinear effects. The 60% coupling efficiency for pulses with the centimeter wavelength of 1 030 nm and the power of 2.3 W at the repetition rate of 250 MHz was achieved and the generated SC spectrum covered more than one optical octave from 480 nm to 1400 nm. Then， using the high and low frequency components of this spectrum， we measured the carrier envelop offset frequency （ceo） by the standard f-2f interferometer. Near 30dB signal to noise ratio and 500kHz linewidth in 3 dB lower of the CEO beat signal has been got.

Key Words：The taped fiber； Supercontinuum； Ceo signal

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