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我国的碘稳频633nm氦氖激光器曾在1980年与国际计量局的同类激光器进行过比对。此后更换了吸收室、激光管和谐振腔镜,稳频器中某些器件及拍频测试系统也作了更新,因此有必要作一次检验。按照亚洲及太平洋地区计量规划组织的安排,新西兰国家物理工程研究所(PEL)的R.B.Hurst博士于1984年携带该所的碘稳频633nm氦氖激光器到北美、西欧及亚太地区共九个国家进行巡回比对,四月份到达北京,在中国计量科学研究院(NIM)与我国作为长度基准的同类激光器进行了比对。 整个比对共进行了两组,测量了碘127的d、e、f、g四个吸收峰的频差矩阵,采样时间为10秒。比对的结果是:频差△f_(PEL-NIM)为 28.6kHz,每组测量值的Allan方差为2×10~(-11)~5×10~(-12)。两组测量中计算得到的△f_(PEL-NIM)的均方差为1.3kHz。 PEL激光器的工作条件为:输出功率32μW(腔镜透射率0.13%),冷指温度18℃,峰-
China’s iodine frequency-stabilized 633nm He-Ne laser in 1980 with the International Bureau of Metrology over the same type of laser. Since then replaced the absorption chamber, laser tube and resonator mirror, some of the devices and beat frequency test system has also been updated, it is necessary to make a test. In accordance with the MEO arrangement in Asia and the Pacific, Dr RB Hurst of the New Zealand Institute of Physics and Physics (PEL) carried the iodine-stabilized 633-nm He-Ne laser in 1984 to nine countries in North America, Western Europe and the Asia Pacific region Tour comparison, arrived in Beijing in April, in the China Institute of Metrology (NIM) and China as the length of the benchmark for the same type of laser were compared. The whole alignment was conducted in two groups, and the frequency difference matrix of the four absorption peaks of iodine 127, d, e, f and g was measured, and the sampling time was 10 seconds. The result of the comparison is that the frequency deviation △ f_ (PEL-NIM) is 28.6 kHz, and the Allan variance of each measurement is 2 × 10 ~ (-11) ~ 5 × 10 ~ (-12). The mean square deviation of △ f_ (PEL-NIM) calculated from the two sets of measurements is 1.3 kHz. PEL laser operating conditions are: output power of 32μW (0.13% endoscopic transmittance), cold finger temperature of 18 ℃, the peak -