Ideas for Full XCHAN Aligment -- untested

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(From X Che 2015Jun)

If we really need a full alignment, here is what I think we should do without taking apart the pieces.

1. check the alignment of single-mode fiber and its lenslet array. Put the laser on beam 3 and 4, maximize the throughput, and visually check the images behind the beamsplitter. If the two images are pretty much Gaussian, and they are vertically aligned, then this alignment is good.

2. If step1 is good, then the angle misalignment must happen in multimode fiber and its lenslet array. This can also be confirmed if the intensity of beam 3 and 4 don't go the same direction when tiptilting the stage. The goniometer that holds the multimode fiber should be able to fix it. By observing the intensity change on beam 3 and 4 when tilting the stage in one direction, we can pretty much guess which direction we should change the goniometer.

3. one last thing is that the output of the multimode fibers may be blocked, have you tried to tiptilt the platform of the triangular mirror?

Hope that helps.

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