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一、引言西德物理技术研究院研究稳定的激光器以取代光波波长基准或频率基准,以及实现长度单位的新定义。长度单位在1960年通过以氪~(86)跃迁光波波长来定义。氪~(86)波长标准灯实现的不确定度为±4×10~(-9)λ。它对于几乎所有高精密长度测量都
I. INTRODUCTION The West German Institute of Physics and Technology studies a stable laser to replace the light wavelength or frequency reference and to achieve a new definition of length units. The unit of length was defined in 1960 by the wavelength of light at krypton ~ (86) transitions. The uncertainty of krypton ~ (86) wavelength standard lamp is ± 4 × 10 ~ (-9) λ. It is for almost all high-precision length measurements