Since we decided to have gouy phase 90 degree different on two quadrants instead of exactly 0 and 90 degree, I calculated again the telescope based on the beam waist reported in last entry.
In the case of two different axis has different beam waist size, I made two different telescopes.
The telscope was designed to have more or less same quadrant position as before, and to have two quadrants one before and one after the beam waist.
1. beam waist of 711um
500mm lens 1.5m from the Faraday Isolator including the height increasing in the periscope.
|
Telescope |
Distance between lens and quadrant |
Beam size on the quadrant |
Gouy phase at quadrant position |
|
1 |
0.41m |
0.19mm |
48.2 |
|
2 |
0.58m |
0.15mm |
139.4 |
2. beam waist of 1274um
1m lens 0.975m from the Faraday Isolator including the height increasing in the periscope.
|
Telescope |
Distance between lens and quadrant |
Beam size on the quadrant |
Gouy phase at quadrant position |
|
1 |
0.925m |
0.19mm |
60.6 |
|
2 |
1.11m |
0.16mm |
150.5 |
We will check the green injection path these days, if we could have a more round beam in the reflection, we can measure the beam again.