This is an update to 11401. I have been looking for an accurate way to measure the amount of power exiting the cavity when the cavity is locked with 775 but in the configuration that attenuates 1550 light. This is easy when the beam is wellbehaved.png. However because there is a massive difference in powers we need to measure in the two configurations, we must either turn the power way up so that we can measure the attenuated beam, and struggle with the saturated coresonant beam. Or, turn the power way down and easily measure the coresonant beam but struggle with the attenuated beam. This script should solve the former, where I have applied a mask to the data array that makes up the camera data, getting rid of any saturating data and then fitting to that portion of the data instead, seen here: saturated_solved.png. 

I am still looking into a proper way to sum these values without getting the background light. There may also be some pick up of the 775 light on the 1550 camera in the low power setting as the expected amount of light from both should be order nanowatts. I am going to retake these pictures (and remember to write down the exposures) now and will update.