Measurement of the frequency of the P14 (10.6 μ) CO2 laser line

The CO₂ laser emission frequency was measured by coincidence with the eighth harmonic of a D₂O laser (first harmonic at 84 μ). The results were used as the basis of a proposed system for measuring the frequency of a highly stable helium-neon quantum oscillator including a methane absorption cell and a D₂O laser.