Search results

So after a virtual eternity in US customs I received the diode today. Bad news:( it is a #$%^ing three beam diode. I sent the seller a message asking if maybe they shipped the wrong part. Will report back with their response.

Dude, RC is correct. Its not practical. You don't have to be an engineer to see it. And BTW I am an engineer.

I see. Sorry. Have you tried this with a tiny short FL aspherical lens? Not easy to do with any accuracy.

I don't think you understand what I'm trying to say. I was saying, if you have a know FL (EFL) lens you can use it to find the approximate FL (EFL) of an unknown lens with decent accuracy. You can't use the BFL or WD to do this, its meaningless for this calculation. Another example. If...

G2 Here is the lens china ripped off and became G2. You can see the FL = 4.02mm. Also, WD = BFL You should go back and edit your posts so people in the future don't get the wrong info. I too have noticed the 3E are not all the same. The half threads always seem better regardless of...

That's the back focal length (BFL). 4.02mm is the actual FL. 4mm is close enough.

To find the FL measure the long part of the spot at a decent distance, say 15-20 feet. Then measure the the spot at the same difference with a known FL lens, say a G2 (4mm FL) then just take the ratio to find the unknown. For example if the G2 spot is 20mm wide and the unknown is 10mm then...

Yeah its semantics. CDBeam is saying "multiply/ expand" the beam diameter (in that axis), therefore reducing the divergence. Its always reciprocal. Beam dia 2X = Divergence/2 and so on....

CDbeam is correct. The divergence is opposite the raw diode after the colimation lens. This is because the lens is imaging the emitter far field. The raw diode divergence doesn't have anything to do with the after lens divergence. The Raw diode divergence only dictates the beam dimensions at...

Yes, thats the one. Thanks for posting. In general, not necessarily your case RC, I guess its easy to see how it can get confusing. If you just look at a module or pointer and visually see that one axis expands more (faster) intuitively it would seem that is the fast axis. One just has to...

Yeah Paul is wrong. Im not sure how everyone got turned around. Probably like a lot of things on the interwebs one person posts it and it gets repeated. The first picture on the link alaskan posted is right...

EDIT this is in reference to the photos from above. That are not quoting for some reason This is exactly backwards. Not sure, but Paul must have read the book wrong. The wider part of the emitter has the " slower" smaller divergence. The narrower dimension has greater "faster" divergence...

Sorry to hear that about the meds. I dont remember, but i think I bored it out for 9mm diodes. I know. I built few to settle the discussion (argument) about accuracy, alignment, etc. Basically nobody believed me, so i figured it would be a better use of my time to build a few and let...

You guys ever gonna test those mounts I sent out?

Strange about the offset red diode. With the HL0637AA2, you are getting about 1mRad with a 3mm aperture? Thats pretty good. How is the far field spot? any pics of just the red FF?

I don't think the listed numbers mean much due to the lens. I would guess the pre-lens divergence is 2X the P73, or worse.

I wonder if these are the "1.8w" mitsubishi a few other sellers have recently listed. Maybe a version without the lens or recaped? I think Im gonna try the $60 1.8W from ebay when the seller gets back from holiday.

Looks like your positive cylinder is about 12mm wide. If you want a little better divergence try moving the beam expander further from the diodes. Keep moving until the output is almost as wide as the lens. Then re-focus the beam expander. Should give 20-30 percent better divergence.

sellers reply for datasheet; Thanks for your message. Because this diode is extracted from brand new machine. I am so sorry we do not have datasheet of this diode. But we can provide these information: Brand: Mitsubishi Center wavelength: 638nm Output power: 1.8W+ Operating voltage: 2V...

All 3 feedbacks are "private". Good chance its bogus. Maybe he is selling USHIO HL63283HD as the mystery mistu? Hard to know. Just checked... seller is selling USHIO 1.2W also and looks to be using the same photos for both.