I did re-alignment work of HOMs' paths and beam profile measurement.
The results of the measurement will be uploaded tomorrow...
The attached picture is a current situation of HOMs.

The purpose of the alignment work was to determine the beam paths of HOMs.
Since I put a BS in order to pick off both HOMs and detect the beat note between them which will contain coating thermal noise information.
One of the HOMs beam pass through the BS and another one is reflected.
Then both of them entered a PBS which is used for combining TEM00 and HOMs.

[Next Step]
Install mode matching lenses for each beam path.
I need to buy some posts for them.