At the moment we have a mix of commercial fibre and the custom (Fabrice) fibre. The mix is due to some fiber being short and the necessity to get light into HAM6 and align the OPO asap.
For Green
We still have a Thorlabs patch fiber from the PAF-X-5-A coupler delivering 2.6mW to the patch panel with about 70% coupling efficienecy. A Thorlabs fiber (extension) delivers 1.4mW to Fiber SN11 (E1700235-V6). SN11 delivers 0.7mW to the vacuum feedthrough. A seperate measurement (alog40762) shows the vacuum feedthrough (SN8) and in-vacuum fibre (SN6) together are 88% efficient.
For IR
SN10 temporarily goes from the PAF-X-5-C coupler to the patch panel delivering 9.37 mW with 72% coupling efficiency. We use a communications fibre as an extension that delivers 8.9mW to SN12. We forgot to measure the output of SN12 and we only get 3.5 mW into the chamber at the output of SN7.
Summary to date of Fabrice's fibres
SN8+SN6=88% (alog40762)
SN11=50%
SN10>72% (includes free-space to fibre coupling efficiency)
SN12+SN9+SN7=40% (unfortunately forgot to measure SN12 individually until after it was connected, and it's awkward, maybe revisit after close HAM6)
Still to install switch and fibres SN9, SN8 and SN7, revisit SN11 and SN12 when time allows.
After tweaking beam alignment and the collimation lens that sends light into the fibre input couplers on ISCT6 we have the following updated results
SN10 > 90% (Seed, includes free-space to fibre coupling efficiency)
SN7 > 85.5% (Green, includes free-space to fibre coupling efficiency)
SN8 > 86% (CLF+Seed, includes mating sleave from fibre switch)
SN9 > 86% (CLF, includes free-space to fibre coupling efficiency)
I've notice some of the mating sleave's are worse than others (one as low as 70% transmission).
I will revisit SN11 (the long green fibre) when the balancing is finished and access is easier.