Practical Application of the CO<sub>2</sub> Laser to Long Distance Measurement by Interferometry
R Turner; E K Pfitzer; R Turner; Division of Physics, National Research Council of Canada, Ottawa 7, Canada; E K Pfitzer; Division of Physics, National Research Council of Canada, Ottawa 7, Canada
Журнал:
Metrologia
Дата:
1970-08-01
Аннотация:
A simple passive cavity CO<sub>2</sub> laser has been designed and shown to be ideally suited for length measurement applications, particularly for the calibration of long tapes. The laser wavelengths for three CO<sub>2</sub> transitions [viz. P (20) and R (18) of the 00°1 - 10°0 transition and R (22) of the 00°1 - 02°0 transition] have been measured to one part in 10<sup>6</sup>. The refractive index of dry air has been measured at the above three wavelengths and found to be 1.0002688 ± 0.0000003.
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