[Aritomi, Eleonora P., Eleonora C.]

Yesterday we have realigned both the BAB and the CC beam. After the difficuties found last week we decided to put a beamspliter in transmission from OPO and check the beam both with camera and PD.

The aligment was quite easy to achieve but even in a good condition we could see some residual scatteerd light coming from OPO in the camera.

We had a coupling of about 85% for BAB (pic 1) and 95% for CC (pic2).

The BAB is now injected using a magnetic flipping mirror (http://www.1md.co.jp/fbp1000s_E.php). (pic 3) We checked the reproducipility of the aligment after taking off and putting back the flip mirror. It is quite good (but not as good as reported in the datasheet (http://www.1md.co.jp/fbp1000s_E.php)): anyway a clear FSR with highTEM00 can be seen and the optimal condition is easy to recover.

Finally we had re-aligned the CC and Main laser pick-off into the fiber.

NOTE: Please when putting on and off the mirror follow the procedure in pic 4.