the attched image is the plot of the datas from two high power experiments,

- the blue curve is from the high power experiment on 12/09/2018, injecting laser power is 27W, power inside cavity dropped from 157kW to 138kW in 33 min, during the 33min, no high order mode appeared, the two zooms of the blue curve just to show that they are un lock of the cavity but not high order mode;

- the red curve is from the high power experiment on 14/09/2018, we increased injecting laser power to 41W, the power inside cavity dropped from 205kW to 197kW in 30min, no un lock and no high order mode appeared.