http://confocal-microscopy-list.275.s1.nabble.com/Dichroic-mirror-double-reflections-issue-tp7584577p7584580.html
on the non-reflective side. From the URL it was not clear if the optic has
the AR coating. Also are you using the dichroic at 45 degree incidence.
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>
> Hi there,
>
> I recently bought a dichroic mirror from Chroma (2mm thick reflecting
> fluorescence,
>
https://www.chroma.com/products/custom-inventory/nc302987-zt670dcrb) for
> our confocal fluorescence microscopy setup. But I found that with the
> reflective side oriented correctly, at the reflection band, the reflected
> beams seemed splitting into two and partially overlapping with each other
> (ghost image?). This happens at a wide range of incident angles, and as I
> rotated the dichroic (changing the angle), the "overlapped" reflection
> alternated between partially overlapping and two distinct separated (by a
> dark line in the middle) half circular beams.
>
> Images of single fluorescence bead also showed 'side lobes'. So I was
> wondering if anyone has experience on how to eliminate such effect? Is this
> common for dichroics? Or it is specific for the one I have and I should get
> another one?
>
> Thank you very much in advance, and I wish you all Happy New Year!
>
> Lu
> -----------------------------------------------------
> Lu Yan
> Nanostructured Fibers and Nonlinear Optics Laboratory
> Electrical and Computer Engineering
> Boston University
> 8 St. Mary St., Boston, MA, 02215
> 617.353.0286 (office) | 617.358.5917 (lab)
>
[hidden email]
> -----------------------------------------------------
>