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Oh you're talking about the collimated beam, I was talking about the raw output, which leads to cropping if it's larger than the lens, which happens when the lens is farther away. By the way, the laser used to ignite white paper when focused, now it will only make some embers. Even with the G7...

That just makes no sense, the closer the lens is, the smaller is the captured beam, reducing the cropping. The cropping is just barely noticeable in this photo, but when I slightly adjust the focus from infinity you can easily see the round edges of the spot. the diode is also slightly...

The fuzz is due to the lens, the raw output is pretty clean despite being waaaay too divergent. The point of that photo was to see the curved edges of the rectangle, indicating that the output is cropped, even with the lens as close as possible to the diode.

I had no idea about that, I just used the fist website I saw, as I couldn't find the upload on Imgur. Tried another site, here you go: https://ibb.co/XCw9wv0 https://ibb.co/z5GTCL6

Yeah, the raw output hits the damn heatsink itself (the diode is 1-2mm recessed in it because I accidentallly pushed it once, just had to readjust the infinity focus, no big deal), and about 1cm on each side of the host. Here are some images of the raw diode output inside the host, and of the...

No, it isn't, I can focus it to infinity perfectly fine (just over 2mRad). It's just that the beam gets cropped by quite a bit because the raw output has 120° divergence for some damn reason. Might just be a defective diode. I'm probably better off just buying or building something else...

I'm not considering it. I want it for my Gatling, which for some reason has like 120° of raw output divergence, getting cropped even with the lens touching the heatsink, therefore even a G2 will produce a wide initial beam. The divergence after the lens is just fine though, around 2mRad.

I know, that's why I'm even considering the G2 lens. I'm curious about the divergence in that case.

I know it's not, I was talking about the raw beam diameter. Because it's insanely high, it will probably create a beam with the full width of the G2 lens, even with the short focal length. My question is, if the initial beam diameter is the same with a G2 and a G8 lens, would the divergence also...

Thanks, but that doesn't say anything about whether the beam is cropped or not. By the way, would a G2 lens have equal divergence to a an LFL lens if the initial diameter is equal? Because my gatling has some insane raw diode divergence for some reason, something like 120° or more. It hits like...

I have read something about someone comparing the NUBM44 with G2, G3, G7, G8, and 3-element lenses. The measured power suggests there isn't much cropping. 5.2W with a 3-element vs 6.8 with a G2. That is right on par with the 70% rated efficiency for 3-element lenses, and 92% for G2 lenses.

Alright, what about a NUBM44 and a G8 lens? EDIT: I did the calculations, assuming a focal length of 8.0mm (Odicforce G8), and a raw output divergence of 60°, a lens diameter of 6.5mm; 2tan(60°/2) = 1.155 (the correspondance between mRad and tan(x) decreases with high angles), and 1.155*0.008 =...

Does this mean what I said is right? You have to move the lens closer to the diode to prevent cropping resulting in a smaller initial beam and higher divergence? And if not, then how do people avoid significant cropping with diodes like the NUBM44 without a G2 short focal length lens?

Hello, I apologize in advance for the dumb question. So, is the fact that the lens needs to be closer to the diode to capture all the light the reason that more powerful blue diodes with a higher raw divergence have a higher divergence after passing through the lens? According to my...

Already ordered it. PL-E Mini 520nm 1W with goggles. I used the ones that came with the Gatling until now. Total was 280€ with shipping.

The factor is actually 2³=8x for the average person according to the article I linked earlier. Gray himself said it shouldn't be overspec as they use a 3-element lens with the raw diode output being 1.4W, bringing it down to 1W. I have already made my decision, I am going with the PL-E Mini as I...

I asked Gray what type of lenses they use, he said they use 3-elements, bringing the 1.4W raw output to 1W, and that he would talk to his staff about my suggestion to use G7/G8 type lenses.

Already found that out, about the raw diode output, from what Encap linked. What I still don't understand is why, when approaching infinity, the beam keeps getting thinner on one axis but the other one stays the same, despite the focus being changed.

Yes, I understood. By the way, doesn't the lowest possible divergence reduce proportionally to the apertude width? I mean, that's why beam expanders exist. That might explain why the initially fast axis becomes the slow one, because the aperture diameter is higher.

Sorry, I'll try not to do that. I just messed around with the lens a bit more. What seems to be happening is that when the laser isn't focused to infinity the fast and slow axes are the same as before passing through the lens, but when it gets close to infinity, at some point, only the fast axis...