05/16/06 Experiments and Analysis

Conclusions

I suggest replacing the M2 mirror with an enhanced aluminum version, such as CVI part EAV-PM-4050-C ($730). This will get rid of the red dropout, and has >99% reflectivity for S pol 589 nm. The red data suggests there may be a yellow dropout on the current mirror. We have no data on this yet, but it may be prudent to get a mirror on order. The EAV mirror will also eliminate the need for a backstop on M2, as there should be no appreciable light leak through it.

The similarity of the polynomial fits between the two runs suggests that writing a correction equation as John Angione has requested would work.

* BTO_2006_05_16_v1.pdf: BTO_2006_05_16_v1.pdf

Follow-up

AB: The following parts were ordered on 5/25/06:

Newport Corporation

Part: 40D20.ER1 (Broadband Metallic Mirrors, 4" diameter, Pyrex, 1/10 wave surface, enhanced aluminum coating) Price: $440 Count: 1

Part: 40Z40.ER1 (Broadband Metallic Mirrors, 4" diameter, Zerodur, 1/20 wave surface, enhanced aluminum coating) Price: $686 Count: 1