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Old 06-19-2017, 05:27 PM #257
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Default Re: OPT Lasers Cylindric lenses - NUBM44 beam correction tests

So as not to produce wings before tightly focused and we need the concave lens to print on the convex at no more than about 80% coverage throughout it's focusable range, or working range, in short we don't want to over expand and clip the expanding beam.

-----edit-----

You will be thrilled with a working BE, it really makes a heck of a difference, I was keeping an eye on a stray kitty I feed and left my camera zoomed in, but you can see the hole in the plastic tote box lid is not very big, well under 1/2 an inch.

This is at a god honest 50 feet no messing around.



----edit----

Here's some pics of the hole, I burned it when I was setting up the target backing and it looked rectangular, like a double square, but we know the hot spot is in the center so.... we can't go by the hole to determine clipping. A wood print shows a better spot image.




Attached Thumbnails
OPT Lasers Cylindric lenses - NUBM44 beam correction tests-sany1030.jpg   OPT Lasers Cylindric lenses - NUBM44 beam correction tests-sany1036.jpg   OPT Lasers Cylindric lenses - NUBM44 beam correction tests-sany1040.jpg   OPT Lasers Cylindric lenses - NUBM44 beam correction tests-sany1041.jpg  


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Old 06-19-2017, 07:36 PM #258
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Default Re: OPT Lasers Cylindric lenses - NUBM44 beam correction tests

I have a working beam expander, And I Know it is not clipping because it can't.....
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Old 06-19-2017, 07:49 PM #259
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Default Re: OPT Lasers Cylindric lenses - NUBM44 beam correction tests

No bud, I am saying I want to build or have built some 75mm wide 10x BE's for use with all our MM diodes, they could work on the GBall diodes with GBall lenses intact just like the 3X does as well as the corrected beams, I didn't know you had one in your front end, but anyway I am looking for the right lens combination to suit our variety of diodes like the 3X does only bigger and stronger.

Also I never said you were clipping, your spot does not look clipped.

----edit----

Actually I was thinking back to a pic Alaskan showed me from a laser fitted with his own expander that had made a round spot on a plastic trash can, my revelation is that rectangle spots can make round holes as the center of a bar shaped spot is the hot spot that burns/melts first, so his round spot just like mine in plastic do not necessarily indicate a round/clipped spot.
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Old 06-19-2017, 08:38 PM #260
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Default Re: OPT Lasers Cylindric lenses - NUBM44 beam correction tests

Guess what I just tried, My OPT Laser 6X/3X Cylindrical Three Lens Fast Axis Correction setup with my custom BE and at 50 feet (measured with a tape measure) I just got a personal best focusing the beam expander to the smallest spot of 10mm x 4mm !!! Holy C$#@ !

This is the lens arrangement I'm using....



It melted this hole at 50 feet pretty dang fast !



But it is on the verge of clipping the fast axis and I think it is clipping just a very small part of the outer most corners but I can enlarge the inside of that lens housing....
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Old 06-19-2017, 09:17 PM #261
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Default Re: OPT Lasers Cylindric lenses - NUBM44 beam correction tests

Very nice, but you do understand what I was saying about plastics/polymers?

My hole is 1/8 of an inch but the spot was a rectangle, the center is the hottest.

So our actual spots can be a little bigger, but if we print on wood and give it 10 seconds to really burn in, then we can see the full print.



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Old 06-19-2017, 09:27 PM #262
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Default Re: OPT Lasers Cylindric lenses - NUBM44 beam correction tests

Quote:
Originally Posted by RedCowboy View Post
Very nice, but you do understand what I was saying about plastics/polymers?

My hole is 1/8 of an inch but the spot was a rectangle, the center is the hottest.

So our actual spots can be a little bigger, but if we print on wood and give it 10 seconds to really burn in, then we can see the full print.
Yes I understand, If you look closely at the hole mine made it is wider that it is tall and is not round at all, Mine seems to be equally hottest along a very short and very, very thin line and doesn't seem to have a hot center per say.....
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303 Prome Star Series Green Laser 532nm 80mW DPSS Class IIIb

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Old 06-19-2017, 09:39 PM #263
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Default Re: OPT Lasers Cylindric lenses - NUBM44 beam correction tests

Our holes look just like my burns inside the rectangle seen through safety glasses, yours just burned a second longer than mine.

Now I could be wrong, but print it on wood and let it cook for 15 seconds then measure that and keep it as your high water mark.

Seriously, just look at my 1/8 inch hole, I walked up and looked at that, the bar was 3/8 by 3/16 plus some blur on the top edge, but the hot center burned that hole.

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Old 06-19-2017, 10:56 PM #264
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Default Re: OPT Lasers Cylindric lenses - NUBM44 beam correction tests

With these pictures you can see the old 50 foot spots that were made at a longer time and are much bigger, The new spots were made with quite a shorter time and are much smaller, Not only than but you can see they were much hotter because of the whitish/grey ash across most of the new spots.....



You can even see a bit of a "tail" on the right one because it was burning as I was moving the board.....
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"Thor's Hammer" Americanised TLY-L201 Host Build W/Old School NASA Type Safety Switch - DTR NUBM44-81 8+ Watts at 4.5 Amps 450nm Diode In A 25mm Copper Module W/Driver - DTR G-2 lens - OPT Laser 6X Cylindrical Lens Pair Fast Axis Correction w/ Custom Made Beam Expander w/Jetlaser Output Lens Class IV

303 Prome Star Series Green Laser 532nm 80mW DPSS Class IIIb

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Old 06-20-2017, 12:09 AM #265
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Default Re: OPT Lasers Cylindric lenses - NUBM44 beam correction tests

You should be able to reach flash point and ignite a paper bag, you were real close before.
Try crumpling it up to increase dwell time on the inner folds, it will flash to flame when it gets hot enough, 450 degrees F.


https://en.wikipedia.org/wiki/Autoignition_temperature

--edit--

Yes it's a lead pipe synch at 25 feet, that's why it's a good benchmark, plus...... I like make fire...ugg...ugg

But seriously everyone take cautions and be safe, don't damage property or put people at risk, I'm a professional....well not really, but don't try it at home unless you have old fashion common sense, and that's getting to be less common these days.
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Old 06-20-2017, 09:06 AM #266
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Default Re: OPT Lasers Cylindric lenses - NUBM44 beam correction tests

Well I had to remove the 3X concave lens from the mix because I was getting a weird highly exaggerated butterfly wing waste effect when I focused the BE for most burning power, So now I'm just using the Opt 6X concave and the Opt convex cyl lenses before my custom BE, Plus by removing the other Opt 3X convex lens from the mix there is no chance the beam can get clipped anywhere so that's a plus !

This for the moment setup seem to be a combination of the smallest spot and at the same time the cleanest spot at 50 feet, Another plus is by removing one of the lenses I am also removing the power loss that is associated with running the beam through that lens, but I have to run more tests.....

I really wish I had a laser power meter to test real world power at 50 feet because that's the only way to be sure of the most power down range in the tightest spot.......

------------------------------------------------------------------------------

Update......

I got the spot even smaller today with the most power in the smallest spot at 50 feet, The visible light spot is only slightly larger the burn spot !!!






This is what the beam looks like at about 6 - 10 feet with only the beam expanders double concave lens diverging the beam.......



And this is after the beam expanders doublet convex is added unfocused.....



From there the square beam gets focused down to a insanely small square at 15 feet or less, Or at 50 feet it's more like a very short "line" shape that's very close to 13.40mm x 4.6mm and starts burning anything put in front of it immediately......

So far this is the most power I've gotten down range (50 feet) in the smallest, tightest beam spot !

Right now I'm trying the bring the 13.40mm axis in some more by re focusing the Cylindrical Lens Pair......
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303 Prome Star Series Green Laser 532nm 80mW DPSS Class IIIb

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Old 06-22-2017, 04:09 PM #267
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Default Re: OPT Lasers Cylindric lenses - NUBM44 beam correction tests

This home made beam expander I made works so well that this is how insanely tight it can focus the corrected beam at 3 to 4 feet away, While sitting in my chair it only took a few seconds to draw this line at near writing speed and a flame was shooting out the entire time !!!

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My very short laser collection (for now)

Thor "Saber" Americanised Thor M II - DTR M462 2.2 Watt 462mn Diode W/Super X-Drive @ 1.8 Amps - DTR G-2 lens - LSP 4X Cylindrical Lens Pair Fast Axis Correction w/ Custom Made Beam Expander w/Jetlaser Output Lens Class IV

"Thor's Hammer" Americanised TLY-L201 Host Build W/Old School NASA Type Safety Switch - DTR NUBM44-81 8+ Watts at 4.5 Amps 450nm Diode In A 25mm Copper Module W/Driver - DTR G-2 lens - OPT Laser 6X Cylindrical Lens Pair Fast Axis Correction w/ Custom Made Beam Expander w/Jetlaser Output Lens Class IV

303 Prome Star Series Green Laser 532nm 80mW DPSS Class IIIb

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