Below are new alamode calculations of the PRC and SRC g-factors and arm mode matchings. These include fixes to the ABCD matrices for the flipped folding mirrors that properly (hopefully) take into account the focusing effect of passing through the optic substrates.
I've used nominal curvatures of **-600 m** for the G&H PR2/SR2 optics, and **-700 m** for the Laseroptik PR3/SR3 dichroics.
An interesting and slightly disappointing note is that it looks like it actually would have been better to flip PR3 instead of PR2, although the difference isn't too big. We should considering flipping SR3 instead or SR2 when dealing with the SRC. I'll take responsibility for messing up the calculation for the flipped TTs.
### PRC
**PR2 Reff** |
**PR3 Reff** |
**PRC g-factor (t/s)** |
**ARM mode matching** |
Inf |
Inf |
.94/.94 |
.999 |
-600 |
-700 |
.99/.98 |
.84 |
413 (flipped) |
-700 |
.94/.93 |
.999 |
-600 |
409 (flipped) |
.92/.94 |
.999 |
413 (flipped) |
409 (flipped) |
.87/.89 |
.97 |
### SRC
**SR2 Reff** |
**SR3 Reff** |
**SRC g-factor (t/s)** |
**ARM mode matching** |
Inf |
Inf |
.96/.96 |
.999 |
-600 |
-700 |
NA |
NA |
413 (flipped) |
-700 |
.96/.95 |
.998 |
-600 |
391 (flipped) |
.94/.96 |
.996 |
413 (flipped) |
391 (flipped) |
.90/.92 |
.96 |
RXA: maybe nominal, but we don't actually have measurements of the installed optics' curvatures, so there could be ~10-15% errors in the RoC. Which translates into a 1-2% error in the g-factor. |