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- Sep 20, 2013
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Photo sensors are normally used for low power lasers. Are you sure this is good to 20 watts? Yes, they are fast.
I wonder if they make a fiber coupled cap similar to this?
A can would keep the diode facet clean, if you burn that, it's done, if you burn the window you have another chance to use it, if de-canned.
I've wanted to try feeding fibers from three 1 watt green diodes bundled together at the focal length of a large lens for a long time now, if they indeed do offer that I might try it. The beam pattern would not be pure (edit: not that it would be anywhere near so with a single MM diode), but might be worth it. Not sure how well that might work out because even with professional fiber combined outputs fused closely together much closer than I could make three individual fibers combine, the beams separate in the far distance even then, they are parallel, but clearly seen as distinct beams at the end of a sky shot, as you can see in the photo, below.
Regardless, I believe it might be possible as a hobbyist to get the beams far closer together with individual fibers than a knife edge. Even if aligning the fiber output angles would be tedious when bundled as tightly together as I can get the ends, I'd like to try. Might not work out, but if it does
808 nm FAP800 IR output.
I translated that page to show the same thing you found, two configurations, with a simple window and with a fiber coupling. I will reach out to them and see if they might understand I would like a photo of the latter. There are lots of fiber coupled offerings on the market for green, but nothing cheap. Maybe if these Chinese diodes are cheap, I will get what I pay for, but might be OK. You can google 520 nm fiber coupled diode and find lots of products, but so far I have not found any high power diodes for green.