…with the internal calibration source in the LM-band and in the N-band.
We would like to share with you the first fringes in the LM- and N-band that we obtained today after successfully cophasing all four beams. Below you can see one image in LM-band (in mode medium spectral resolution) with the four beams combined in one fringe pattern, and one image in N-band (in mode high resolution) with two beams combined.
This is a very encouraging intermediate step of the AIV work, some days ahead of schedule, demonstrating that the alignment of the warm optics has been completed successfully. The cold optics needs some further fine tuning to improve the fringe contrast.
Looking forward to fringes on the sky more or less exactly four weeks from today,
Andreas, Sylvie and Yves