If we go with plan2,
1)window and flange
- I think the window size of 2.75" diameter is the largest size for us ( with 3" clearance between the 2 beams). Thorlabs has a 2.75" window with 1.5" optic,with 1.18" opening, so it might not be compatible with its wedged window:http://www.thorlabs.us/NewGroupPage9.cfm?ObjectGroup_ID=5546 which is only 1" diamter.
- Or we can order 2.75" flange with 1" bored, from N-C. to use with Thorlabs' window. Though I'm not sure how to assemble the two together.
2) Two Half-Nipple will be welded to the blank on the 10" flange. They will be 3" apart, as the input beams are. We might need something smaller than 2.75" diameter for accessing all the screws.
3) blank 10" flange: I think Frank said that we have one in the lab. For another one, we can order it from N-C, blank. It is ~$ 300.
I'm not sure how to mount the window and the flange together. If we buy the window set from Thorlab, I think it can be directly assemble them similarly to the current 10" flange, see figure below. Or we might need to mount the windows like Zach does for Gyro, see ATF:1601.

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I'm checking the properties/prices/availability of window for the vacuum chamber.
Plan1: 10" diameter window (6" window opening)
- A&N: ($775), no info on optical quality. This is probably just a regular viewport similar to the one we use.
- Pfeiffer also offers viewports for visually monitoring, so I think they are not good enough.
- MDC fused silica window, for 10" flange ($ 3,297), no optics properties. Only lens grade for ultraviolet are specified, but they claim that for IF also available (viewport)
- Nor-Cal also has flange for 10" and 2.75" with glass,fused quartz, fused silica material. no optics properties shown.
Plan2: 10" diameter blank with 2 smaller windows (1.5"/2" diameter)
- Thorlabs: 2.75" OD window, 1.18" window (windows are replacable, I think we can switch to CVI windows ) ($244 x2) + machining .
- MDC offer 2.73" with 1.5" window, no info on optics properties
Most of the manufacturers do not have good window for laser with 10" flanges. Finding two smaller windows with good optics properties is probably easier.
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