A simple single-frequency He-Ne laser is described in which the cavity ength is designed to be of high stability. The components are precision-made by standard workshop methods so that the laser requires no adjustments after assembly and the reflectors and capillary plasma tube are readily replaceable. Over a period of hours, frequency stability was within 0.01 ppm, with the krypton-86 primary wavelength standard as reference.
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C. F. Bruce (1971) studied this question.
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