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美国标准局博尔德研究所,一直从事3.8垓赫(垓赫:THz 兆兆赫,即10~(12)赫——译注)与10.7垓赫(78微米和28微米)水蒸汽激光频率和二氧化碳激光的P_((18))-P_((20))、28垓赫谱结的频率测量。这种测量是用在未知辐射与低频激光和速调管的辐射的各种谐波的综合之间的拍频,这是照射到钨丝触须二极管而实现的。最近,正在测量甲烷稳定的88垓赫(3.39微米)氦-氖激光频率与波长。估计这种综合测定所得出的光速值的精度,将优于1×10~(-8)。那么,将可能用此精确的数据定义光速 c,并将现在的时间、频率基准也作长度为基准。
American Bureau of Standards Boulder Institute, has been engaged in 3.8 垓 He (垓 He: THz megahertz, that is, 10 to 12 He He - Annotation) and 10.7 垓 He (78 microns and 28 microns) water vapor laser frequency and carbon dioxide Laser P _ ((18)) - P _ ((20)), 28 垓 Hz spectral frequency measurements. This measurement is made using the beat frequency between the unisoned radiation and the sum of the various harmonics of the radiation from the low frequency laser and the klystron, which is reached by the tungsten whisker diode. More recently, the 88 Hz (3.39 μm) He-Ne laser frequency and wavelength for methane stabilization are being measured. It is estimated that the precision of the light speed value obtained by this comprehensive determination will be better than 1 × 10 -8. It would then be possible to define the speed of light c with this accurate data and to benchmark the current time and frequency as the length.