Beam goes into the chamber

The table leg arrived on Friday, so we install them under the original leg, increase the bench to the height we want. Show in the first and second picture.

After doing this, we remove all the tall mounts for infrared and do the alignment again both in the infrared and green path. During the alignment, we found out maybe the cavity itself is a little bit tilt up, with one mirror we recover the beam to the right height.

Then we inject both the green and infrared beam into the chamber.

Firstly, adjust the position of G1 mirror in the picture try to get the green beam in the middle of it in horizontal direction. Then use adjust it slightly to get the reflection beam goes to the GR mirror.

Then we adjust the infrared beam, use the last two mirror on the bench in infrared path to adjust the infrared go through the Faraday Isolator, reflect by the R2 mirror and also goes to the GR mirror.

Then after the GR mirror we try to do our best to overlap the infrared and green beam and get a good result, next step is let these two beams goes into the BS chamber and try to overlap them there.

Then we installed the RP1 mirror, this is a mirror with high reflection with 0 zero degree. Then also install the RP2 mirror, this is the mirror has high reflection in P polarization. With this two mirror we got the p polarization reflection of the infrared beam and it arrives about the right position in the bench.