I used Numata et al's results to calculate the Coating Brownian Noise and compared this to what we measure currently.
Using the parameters for our setup and the equation for the Coating Brownian Noise from Numata et al's : Wide-band direct measurement of thermal fluctuations in an interferometer , I calculated the Coating Brownian Noise (I attached my code for the calculation). I then calculated the total noise with the Coating Noise using Numata's result, instead of our current calculated result. The following noise budget shows the results:
The black curve shows the total noise as calculated with the coating noise from Numata's results. Comparing this to the current beat measurement, the pink curve, there are clear similarities in the shape, with the total noise using Numata's coating noise results lying slightly beneath our current total nosie. The green curve shows the Coating Brownian Noise using Numata's results, and the yellow line is the ci plot for our current calculation for Coating Brownian Noise. As it turns out, our current estimate for the Coating Brownian Noise is about 30% smaller than the estimate using the results of Numata's work. |