Baldwins Latest Mirrors
Here are some of the mirrors
completed from the Baldwin Optical Shop. Well try to load more when we think
of it.
1501 23.625 f/3.76. Data from SIT shows 1/24 wave P-V, RMS of 3.1 nm on the surface,
which is 6.2 nm on the wave-front, which is 1/89 wave RMS, and a Strehl Ratio
of 0.995. However, all optical tests render claims that are actually better
than the optic, so I stand by my promise that the mirror has a P-V less than
1/10 wave, RMS less than 1/26 wave, and a Strehl Ratio greater than 0.94. Below is the SIT test data sheet, far more
reliable than Foucault.
1502 12.5 f/8
1503 6 f/5. Data from SIT shows 1/25 wave P-V,
RMS of 3.2 nm on the surface, which is 6.4 nm on the wave-front, which is 1/86
wave RMS, and a Strehl Ratio of 0.995. However, all optical tests render claims
that are actually better than the optic, so I stand by my promise that the
mirror has a P-V less than 1/10 wave, RMS less than 1/26 wave, and a Strehl
Ratio greater than 0.94. Below is the
SIT test data sheet, far more reliable than Foucault.
1504 32 f/2.82, data from SIT test shows1/18
wave P-V, 5.2 nm RMS on the surface, which is 10.4 nm RMS on the wave-front, or
1/53 wave RMS on the wave-front, and a Strehl Ratio of 0.986. So our claim is
1/10 wave P-V, 1/26 wave RMS, and a Strehl Ratio of 0.94. This was a repeat
mirror, originally we made it at f/3.6, but it was too long, so we reduced it
to f/2.82, which created a whole new set of challenges. Nonetheless, the mirror
came out quite good.
1505 17.5 f/3.9
1601 24 f/3.73, data from SIT test shows 1/12
wave on the original analysis with a Strehl of 0.996, which included a minor
hill dead center. This hill is in the secondary mirror shadow and was 22 nm
tall. However, since it is in the shadow of the secondary mirror as is in no
way part of the optic of the telescope, the below graph shows a more
appropriate analysis of the mirror. The Strehl is 0.999, P-V wave-front error
is around 1/31 wave, but we are still only claiming 1/10 wave P-V, 1/26 wave
RMS, and a Strehl of 0.94.
1602 17.5 f/3.9, data from SIT tests shows 1/13.82
wave, Strehl of 0.985, mirror claim is 1/10 wave, 1/26 wave RMS, and a Strehl
of 0.94.
1603 12.5 f/4.65, data from SIT test shows 1/18
wave, Strehl of 0.966, mirror claim is 1/10 wave P-V, 1/26 wave RMS and 0.94
Strehl.
1702 18 f/4.38, data from SIT test showing 1/16
wave, Strehl 0.990, mirror claim is 1/10 wave P-V, 1/26 wave RMS, 0.94 Strehl.
With the secondary mirror in place, the optical figure
appears even better.
1705 and 1706 Binocular Telescope Mirrors
1705 6
f/7.3, data sheet shows P-V error < l/13, RMS = l/36, Strehl = 0.97,
1706 6
f/7.3, still only claiming l/10 P-V, l/26 RMS and Strehl
= 0.04.
1801 30 f/4
for Sunriver Observatory outside Bend, OR.
