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I agree with Aryeh - this looks very much like a quadrant photodiode.

Best regards,
Beat

At 09:04 02/10/2020, you wrote:
>*****
>To join, leave or search the confocal microscopy listserv, go to:
>http://lists.umn.edu/cgi-bin/wa?A0=confocalmicroscopy
>Post images on http://www.imgur.com and include the link in your posting.
>*****
>
>Dear List,
>Â
>can anybody give me an advice what the following opto-eletronic device is for?
>Â
>Â
>https://imgur.com/a/AhnXyb8
>Â
>Â
>Â
>best
>Andreas Bahmer
>University Frankfurt