I replaced 2 mirrors to BSs which are used for pick off the beam power in order to intensity stabilization.
In addition, I installed a HWP for adjust the polarization of the beam because the polarization is changed by double-pass AOM configuration.
I checked the transmitted beam power with 3.2 mW input.
The result was 0.5 mW and this value was consistent with the spec.
At that moment the angle of HWP was 300 deg.