BAB before OPO is 114.5 mW and BAB after OPO is 0.231 mW, so current transmissivity of OPO is 0.2 %. When transmissivity of incoupling mirror is T1 = 8 % and transmissivity of HR coating of PPKTP is T2 = 0.025 % and round trip loss inside OPO is L, we can get L = 12 % by solving following equation.
T1*T2/(1-sqrt(1-T1)*sqrt(1-L))^2 = 0.002
Escape efficiency = T1/(T1+L) = 40 % which is very low.
If L = 0.425 % like Marco's thesis P.87 (transmissivity of HR coating of PPKTP is 0.025%, not 0.25%), escape efficiency is 95 %.
I checked the website of KTP company(RAICOL crystal), the substrate absorption loss should be 100ppm in our case.
From Marco thesis, the escape efficiency is 0.92/(0.92+0.00425). It is 99.5%, it seems fine in that case.
Escape efficiency is T/(T+L) where T is transmission of output coupler and L is intra cavity loss. So escape efficiency should be 0.08/(0.08+0.00425) = 95%. Calculation in Marco' s thesis seems wrong.