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Nick Brewer: Difference between revisions
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- We borrowed a single mode, polarization maintaining, angle polished fiber that had previously been repaired from Saffman's group. This fixed the power fluctuations seen earlier, but the output polarization rotated causing the output power to drift by 50% after a beam cube. I tried to find the correct input polarization by jiggling the fiber and watching the output power fluctuate after a beam cube, but I couldn't find a good polarization. [[Jared]] said he's seen output polarization rotate due to the wrong input polarization, but it was not as extreme as this, it only caused the power to fluctuate by ~10%. I suspect this fiber is just damaged and the repair that was previously made did not completely restore the fiber (and possibly caused the current problems?).
[[Jared]] ordered some new polarization maintaining, single mode, angle polished fibers from Oz Optics so hopefully that fixes the problems we are seeing. In the mean time I just used the output of the TA to do the single pass texts on the PPKTP crystal. The [[https://wiki.physics.wisc.edu/yavuz/images/d/d7/PPKTP_Data.pdf|results]] were surprisingly close to what was expected:
Single pass efficiency: E<sub>NL</sub>=P<sub>out</sub>/P<sub>in</sub><sup>2</sup>=0.0027 (Simulated E<sub>NL</sub>=0.0029)
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