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一、引言最近几年中,已经对甲烷稳定氦-氖激光的频率及其相对于氪~(86)基准或碘稳定氦-氖激光的波长作了一系列测量,有的已经达到了约10~(10)量级的精密度。影响甲烷稳定激光频率的因素也已详细研究过,如果若干实验条件,例如使用具有大光束直径的长的低压吸收室能得到满足,则其影响约为10~(-12)量级。全部频率和波长测量都是
I. INTRODUCTION In recent years, a series of measurements have been made on the frequency of methane-stabilized helium-neon laser and its relative wavelength to krypton-based (86) or iodine-stabilized helium-neon laser, some of which have reached about 10 ~ (10) order of precision. The factors that affect the methane-stabilized laser frequency have also been studied in detail, and the effect is on the order of 10 to (-12) if several experimental conditions, such as the use of a long, low pressure absorber chamber with a large beam diameter, are satisfied. All frequency and wavelength measurements are