In this paper, we report a gauge block (GB) calibration that is traceable to the SI unit of time, the second. Four ultra-stable optical telecommunication wavelengths near 1556 nm are obtained by locking a narrow-tuning-range fiber laser to a fiber-based femtosecond frequency comb. Since the GB calibration system does not operate at this region of spectrum, the superior frequency stability of the laser is transferred to the 778 nm region by using a waveguide periodically poled lithium niobate crystal. After applying the locking scheme, the stability and accuracy of the laser become better than 8 x 10(-12). The frequency-doubled light is sent through 30 m optical fiber to a GB interferometer, which is installed at a different laboratory in the same building. Using this calibration scheme, a GB with a nominal length of 100mmis calibrated with an uncertainty of similar to 52 nm. This uncertainty value is still comparable to or even better than other metrology laboratories for a similar block length. (C) 2015 Optical Society of America
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机译：在本文中，我们报告了一个量规块（GB）校准，该校准可以追溯到SI时间单位（秒）。通过将窄调谐范围的光纤激光器锁定到基于光纤的飞秒频率梳上，可以获得1556 nm附近的四个超稳定的电信波长。由于GB校准系统不在此频谱区域内运行，因此通过使用波导周期性极化的铌酸锂晶体，激光器的出色的频率稳定性会转移到778 nm区域。在应用锁定方案之后，激光器的稳定性和准确性变得优于8 x 10（-12）。倍频后的光通过30 m光纤发送到GB干涉仪，该干涉仪安装在同一建筑物的不同实验室中。使用这种校准方案，标称长度为100mm的GB的不确定度接近52 nm。对于类似的块长，该不确定性值仍可与其他计量实验室相比甚至更好。 （C）2015年美国眼镜学会
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