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Milos Are you still around ? I'm not clear as to which front lens you used ? Did you end up using the thinner Lasershow's front lens to get the tighter output beam of 4mm ? Because isn't the whole point of this to get the tightest output beam as possible over a distance with the least amount of divergence ?Ok, here is the setup I used combining a 3x from OPT lasers, and a 4x from Lasershow Parts. Basically it gives the best squeeze of the beam for this diode out of all I tested so far.
I tested them with Lasershow's, and then with the OPT's plano convex lens on the front.
Here is setup with Lasershow's plano convex front lens.
and here is the setup with OPT Lasers Plano convex front lens.
Both setups basically produced a 12x squeeze, but the difference was in the front and final piece of glass where OPT lasers produced an output beam of nearly 6mm (5.5mm-6mm) but a bigger necessary distance from the cylindric plano concave 4x+3x set.
The Lasershow's front lens although allowing for an overall shorter setup, it produced a tighter output beam of 4mm!
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I don't know, Is that lens sold any place where it can be easily bought at a website in English ?Hi,
I must try the cylindrical (lower loss) vs prisms (easier to tune & same for all diode) slow axis correction.
Why none use this lens : https://fr.aliexpress.com/item/Broa...32707079178.html?spm=2114.13010608.0.0.JpUxvt
I use it for all my lasers (single and multimode)
This lens work better than 3 element from Aixiz for power loss, and better than G2 for the fast axis divergence (fast axis is the singlemode axis, the thin axis after a standard colimation).
This lens can replace a dusted 3 elements inside the barrel (mount it on top of the screw).
I think we can get awesome divergence for beamshow (galvos with large mirror) with this lens + a good slow axis correction.
For burning pointer the best is still G2 (minimal loss) + correction + beam expander. Without beam expander my lens do better than G2 and 3 elements.
What do you think ?
Pascal
That is a single element aspherical lens with a LFL. It comes without a housing and for the price, is not a great deal at all. I think you can get the same lens in a housing for less than $10.00. It has a focal length of 8mm.
I don't know, Is that lens sold any place where it can be easily bought at a website in English ?
Is it good at a distance ?
I'd be willing to give it a try !
Basically it's like a sanwu G7, it won't correct that highly divergent axis, there is no magic round lens other than possibly an anamorphic lens.
Well I think I've pretty well explained what I'm almost finished doing with my 44 7 watt build, before I try anything else I need to finish what I've already started.....This is the only one I found with this quality and focal length. I'm French sorry for my English.
It look the exactly the same divergence as three element!
This is like the lens used on a 4w (if i remember, the max power they sell) Arctic WL pointer (I ordered a WL and returned because the only good think inside a WL is the lens and barrel ! lol I don't like a product no repairable)
Far field is very good, better than 3element!
I can make a good quality long range picture of the spot for near any DTR diode (single & multimode) if you want, because all my pointer use this lens.
I build a OPT lasers uRGB with this lens soon. lol. (I ordered as "pedantic" kit and without diode, Mateusz is a good person)
I think this is true as focusing the collimator to a given distance can only be unfocused either way you go pasted that point and when it is focused to the sharpest output at that given distance the output without cylindrical lens correction is always a thin line with the 44 ? correct ?I don't understand why persons say the slow axis of the LD get over corrected when you focus the fast axis (a far field line) ... for me a line remains a projected line after a collimator, this is normal ! the emitter is a line!
Well I think I've pretty well explained what I'm almost finished doing with my 44 7 watt build, before I try anything else I need to finish what I've already started.....
By the way I'm getting one of the new 6X OPT Lasers Cylindrical lenses to try against the setup milos came up with.....
That brass assembly seems overly large and cumbersome to me ? But very well built !I want a 6X also but with the brass assembly.
Can I add this assembly on my NUBM44 big host from survival laser with only a 3D printed tube "add-on" ? I must test this!
That brass assembly seems overly large and cumbersome to me ? But very well built !
I'm putting my Cylindrical Lens Pair setup in a adjustable tube as well !
I don't see any reason that could prevent the brass mount from being made more compact and still maintain the same precision as before ?I found the OPT Lasers 2x and 3x existing brass assembly very compact and minimalist ?
The 6x is not machined at this time ?
Cylindrical Lens need a very good precision, and with 3D printing I think I need the brass assembly.
The 6x is not machined at this time ?
I don't see any reason that could prevent the brass mount from being made more compact and still maintain the same precision as before ?
At this time we can order lens only (without brass) I'm not CNC equipped I have only a filament 3D Printer. I think I can't use raw lens because they need huge precision. I think I can use prism pair because easier to tune.
I don't understand what you mean by this ? The 6X lenses are finished and they are made the very same way as the other lens sets ?