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4 mirrors and thin-film polarisersÂ
p-pol as input
Attenuates to 0.5*0.8*0.5*0.1 = 0.02 (2%)
Issues:
- Appears to introduce astigmatism
- Ghosts when changing polarisation
2022 RP attenuator
4 mirrors and s-pol as input.
Mirrors are 35%R from MPO, AR coating on back and 2 degree wedge.
Attenuation should be down to 0.35^4 = 0.015 (1.5%) or 800 mJ * 0.35^4 = 12 mJ
Reflectivity was tested:
Wedge orientation:
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