July 2001
W. Traub

Classical combiner status
-------------------------

(a) The 3-beam "classical" combiner metal parts were all fabricated
and delivered to IOTA in mid-June, as were the mirrors for the system.
The metal parts for this combiner were not assembled during this run,
so this aspect is untested.  However the same-design platforms and
holders for the IO combiner were assembled, the piezo installed, and
the piezo driven at up to 10 Hz in an interferometer setup, with good
performance over about 80% of the piezo stroke, in both directions
with a triangle wave, which is approximately the expected performance.

(b) The dichroics and beamsplitters were delayed at the supplier long
beyond the originally promised date, and so were delivered near and
after the end of our run, respectively.  Furthermore the dichroics as
delivered were outside our original specification regarding
reflectivity in the infrared, and have been returned to the vendor to
be recoated.

(c) The off-axis parabolas order was partially filled (4 out of a
total of 9, option for 12) by mid-June, and these were used to focus
light onto the fibers in the IO experiment, and were therefore not yet
mounted in the free-space combiner.  The OAPs were then returned to
the vendor to be silver coated at the same time that the balance of
the OAP order is filled.