Figure 5
From: Ultra-stable clock laser system development towards space applications
(left) Simulation of frequency fluctuations based on measured pressure fluctuations inside the cavity’s vacuum chamber and the corresponding fractional Allan deviation (right, blue circles) with linear drifts removed.
The frequency was simulated assuming the refractive index of air for the residual gas of (n−1)/p = 2.7 × 10−7/mbar. (right) The green squared line shows the fractional Allan deviation of a measured frequency of the laser that was taken on the same day as the pressure measurement.
