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双路光谱展宽的钛宝石飞秒光学频率梳系统
Ti：sapphire femtosecond comb with two spectral broadening parts
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摘要: 对中国计量科学研究院研制的第一代基于钛宝石飞秒激光器的光学频率梳系统进行了改进和优化.通过对激光器重复频率、光谱展宽以及拍频信号探测等方面的改进,有效地降低了光谱展宽的复杂性,提高了飞秒光学频率梳系统的稳定性和激光频率测量的便捷性.采用该光学频率梳系统对碘稳频532nm和碘稳频633nm激光绝对频率进行了测量,测量结果在国际推荐值的不确定度范围之内.Abstract: The first generation of femtosecond optical frequency comb （FOFC） based on the Ti：sapphire femtosecond laser in National Institute of Metrology of China,is improved and optimized in this paper.By changing the repetition rate of the femtosecond laser,the spectral broadening parts and the beat frequency signal detection,the complexity of spectral broadening is reduced and the stability of FOFC and the convenience for the frequency measurement are improved.With such an FOFC,the absolute frequencies of the I2-stabilized Nd：YAG 532 nm laser and I2-stabilized He-Ne 633 nm laser are measured.The experimenal results are in accordance with the recommended values by the International Committee for Weights and Measures.
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