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Actually the square FAC will in theory have better divergence for the same focal length collimator. The square beam will be wider than the linear at the colimation lens therefor the divergence after the collimator will be less. The problem I have found is the FAC cuases a certain amount of...

Electro-voice Xi-2183. 2x 18", 12" , 2". Serious beasts.

I have a dead 124b

Not steve but I think I can help here. Only the fast axis is corrected on these diodes. So a lens is still needed to collimate. You need a long FL lens becuase the fac has narrowed the fast axis in an attemp to more closely match the slow axis. Think about a standard correction scheme for a...

The FACed diodes are from laser tree. The laser tree "linear" is too narrow and the "square" is too big in the fast axis for this type of set-up. I had them special made. I think minimum order was 20 pcs and they were about double the normal price. I have a few unused diodes if you're...

There should be more photos with spot and aperture on the photo link now. The spots on the cinder block are at 130 feet. The loss from the fac is negligible. Im at work now, can get some measurements tomorrow. Hopefully can get some outside beam shots tonight.

Hey everyone. Havn't posted in some time. I was going through my shop and have some prototype laser combiners that may be of interest. These are low divergence lasers that use the P73 fac corrected diodes. The diodes are special made by lasertree and not the ones they have on ebay. The...

Wow! thanks for the info. Its def not a Ushio HL63283HD. The best I could do was around 1.5mRad with 8mm width at the aperture. You are doing about 2X better than achievable with a P73, indicating the emitter is about 1/2 the P73. I'm surprised Jors wasn't as exited as Im getting. If you...

Unfortunately, I don't have an actual G8 here. I do have some other 8mm FL lenses to try. I do have the C-lenses. I am fairly certain the FA will be very badly clipped with the 8mm and no FAC. .4mRad is real good. What is the near field like? Is the far field symmetrical or still bar...

I was under the impression it might be the Ushio HL63283HD. I wonder if Jors has any more info on these? I have a HL63283HD here. If turns out you have a FAC'd one we can compare notes on beam specs, PO, etc.

CDB- What red diode are you working with? How does the beam/spot compare to same unFac'd diode using the same optical c-lens set-up?

:whistle::whistle::whistle::whistle::whistle: Bob you're killing me:D Put that lens in front of it. The crowd is getting restless. Sounds like a rotation issue? Maybe the FAC is slightly glued of axis? I'm not 100% sure I follow? So say with the G8 (8mm FL) the SA or the wide part of the...

I know that go back and read my posts. I have been trying for 10 pages to explain how these work. But it should offer much improvement with simple optics. Much more compact and easy to build compared to cylinder pair.

Don't give up yet! The first testers have only had them for a few days. I doubt laser tree had pointers in mind when then FAC'd these diodes. That doesn't mean they can't be used though. Also, about using aspheric lenses to collimate these..... Be careful buying any old aspheric lens...

Ditch the G8. use just the 75mm FL.

My guess would be with a 75mm FL the SA should be around .5mRad and the FA around .1mRad. God only knows what they glued on there and called a FAC. What did the beam look like with the 75mm FL? Im very curios. Also, did the beam fit on the 12.5mm dia?

Read my post #97. I explain it there. The rough example at the bottom is for a m140. The diode you have probably has 2 to 3X the emitter width. You can't have a square beam at the lens and at the far field spot with your diode. The FAC can make it better (more square) by what ever ratio the...

Sorry i misunderstood your results with the 25mm. Sounds promising then. You have a longer fl lens to try? I found this pic online that shows a cross section what is happening in the fiber. Those phosphor things look really cool. I would buy one but my laser budget is zero at the moment.

Its not going to work with the standard lens we are used to. The FAC does give us more leverage to get a "squarer" beam. It should be simple as a longer FL colimation lens. RC didn't have luck with a 25mm bi-convex. Not sure why, should have produced a "squarer" beam than the same...

Hmmm. Well its never gonna be square because the ratios of emitter size to divergence of the raw diode are too "uneven". But if you can't get a better beam/spot than an un-fac'd diode my guess is the FAC is making the astigmatism worse. Two cylinders, one for X an one for Y should fix it.