[Kawamura, Kokeyama, Enomoto]

Desired lenses just arrived this noon, so we installed the mode matching lenses for PMC this afternoon.
Each lens is mounted on a translational stage, which moves in the direction of the light propagation in the range of +/- ~ 25 mm.
We installed these two lenses on stages at the designed positions, and measured the resultant beam profile.
The profile can be seen in the attached figure. The eigenmode of PMC is characterized by w_0 = 548 um and z_0 = 3425 mm, which is our current target.

If one wants to make the profile of the beam from the 2W laser (temporary one for bKAGRA phase1) closer to the target, it will be better to move the lenses by some centimeters, maybe out of the range of the stages.