J. Kissel

Clean parts for the SPI pathfinder are starting to roll in! 

I needed to re-characterize the first-of-its-kind-used-in-LIGO SuK fiber collimator S0272502 (DCC, ICS) now that it's been run through a test Class-B process -- and importantly after the 48 bake at 85 [deg C] (w/ 6 hour ramp up and ramp down) -- similar to how it was tested pre-bake per LHO:84825.

That means need to mount it in either Class-A or Class-B equipment. 

So, I assembled 2x Class-A fiber collimator assemblies for production use, D2400146 using
    - (QTY 1) D2500094 60FC-0-A11-03-Ti, S0272502 Fiber Collimator itself [Currently Class-B; new]
    - (QTY 1) The D2500005 12 [mm] to 25.4 [mm] adapter ring stamped with S0272502 [Class-A; new]
    - (QTY 1) D1100705 3/16 [in] length #8-32 PEEK set screw [Class-A; existing stock]
    - (QTY 1) D2400208 Siskiyou IXM100 1 [in] Mirror Mount [Class-A; new], 
       re-assembled*** with
        - (QTY 2) 1/4 [in]-100 x 1 [in] length threaded hex adjusters, with 5/64 [Class-A; new]
        - (QTY 2) 1/8 [in] diameter SS ball bearing [Class-A; new]
        - (QTY 1) D1100705 3/16 [in] length PEEK #8-32 set screw [Class-A; existing stock]

With these fully assembled, I used the following existing stock of Class-B hardware and tooling to mount it and adjust it for practical use:
    - (QTY 1) 1/4-20 x 5/8 [in] length SS (non-vented, non-plated) SHCS [these were actually Class-A]
    - (QTY 1) 0.50 [in] diameter x 3 [in] length SS optics post 
    - (QTY 2) 0.75 [in] diameter "large" adjustment knob with 2.0 [mm] hex key extension 
    - (QTY 1) 5/64 [in] ~ 2 [mm] hex key (for #8-/32 set screws) 
    - (QTY 1) 3/16 [in] hex ket (for 1/4-20 SHCS) 

*** Pro-tip for assembly of these IXM mounts :: Use the 5/64 hex key or 0.75 [in] diameter "large" adjustment knobs to insert the 1/4 [in]-100 x 1 [in] length threaded hex adjusters most of the way into the "raw" IXM mount. Then, open up the adjuster-plate-to-mounting-plate spring, gently wedge the 3/16 hex key between the front and adjuster surfaces to hold it open, leaving gloved hands free enough to insert the tiny 1/8 [in] ball bearing in place at the tip of the threaded adjuster. Then gently expand and release the 3/16 key from the spring and resume setting the adjusters to nominal position.

Per "best effort," and since S0272502 has to go thru clean-and-bake again to get "classed up" to Class-A, I used 
    - (QTY 1) 2 [m] length FC/APC to FC/PC patch cable (P5-980PM-FC-2)  
with the FC/PC end wiped extensively with IPA and then wrapped in sealed wipes and UHV foil to inject ~100 [mW] of light from the existing optics lab fiber-coupled laser into the Class-B fiber collimator.

The first attached picture shows all of this equipment as it comes "out of the bags" from the clean-and-bake process.
The second attached picture shows the fully-assembled system in use during characterization.
The third attached picture shows the label on the bag that contains the fully-assembled IXM100. (This bag doesn't contain the fiber collimators or adapters themselves, though, as these are with clean-and-bake for the collimators to become Class-A and married with their respective adapter ring.)