Opt Lasers 6X Cylindrical Testing

[RedCowboy]

Remember the beam coming out of the G-2 is very small so 18X that very small beam ends up being 8mm after the last lens......

This is the lens arrangement I'm using, The beam after both of those is 3 feet wide on the wall across the room, Now how it's doing what it's doing ? I don't know, I only know it is and I'm very happy with the results !

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Using a NUBM44 with a G2 and 6X cyl pair I get about a 7mm wide ribbon of a beam that expands to twice that at 30-40 feet, this makes a fun burner that I don't have to adjust, just turn it on for burning up to 30-40 feet, add a 3X BE and it lights a paper bag at 105 feet with a little patience.

I set my concave cyl very close to my G2, the G2 produces a 2 inch wide line at 15 feet, adding the concave cyl makes that line 3 feet wide and then placing the convex cyl at 35mm from the concave cyl brings that line down to about 8mm wide at 15 feet.

If I used an 18X cyl pair I should get a much wider beam at my aperture, that's where the leverage comes from, just like the 3X BE makes the beam a lot wider to start, that is the leverage.

We both start near the G2, the G2 is focused to infinity and I have sharpened up the line a little closer but the difference is small.

I just don't see how you get a 8mm wide beam with an 18X cyl pair using the same diode and primary lens.

The leverage is in the wider starting beam even when on just the aggressive axis, I don't understand unless your cyl pair is not 18x

Both these are 44's with G2's and 6X pairs and are fun with that static set up for the short range, moving the convex cyl like you do would fine tune a sweet spot in the short range but would not make an appreciable difference burning at 50-100 feet.

I am not knocking your build or your efforts, I am trying to understand why 18X is not giving you a wider beam at the aperture, if it was and you made the convex cyl adjustable then you would have some additional leverage further out, but you said it's 8mm wide ???? How?

What is your separation between your cyl lenses at infinity, is it more than 35mm, that could create a range for adjustment if your infinity lens separation is more than 35mm.

----edit-----

Looking at Milos original thread I don't know if we can measure center to center the same, the way the 2 concave lenses add up is part of the mystery.
I would think center to center would be from the mid point of the inside concave, and that puts it in near the same 35mm of separation......hmm

-----edit-----

I think the best way is for me to build the same set up myself and test it to see what's going on, you used the opt lenses, if you have a like to the sale for these 3 lens sets you can post it or I can find it, I just don't know that it's going to make a big difference, I suppose I should read all of Milos postings, didn't he say his was being rebuilt?
I think the best use of funds would be in finding a 6X BE with a 2.5 inch wide objective and good machining, the perpendicular alignment of higher power BE will need to be very good and uniform across it's adjustment.

 

[Accutronitis]

I'm using both these sets........

Cylindrical lenses 3X magnification (AR 400-700nm) RED - Opt Lasers
Cylindrical lenses 6X magnification (AR 400-700nm) - Opt Lasers

with the G-2 lens right up to the lens sets....

Both these are 44's with G2's and 6X pairs and are fun with that static set up for the short range, moving the convex cyl like you do would fine tune a sweet spot in the short range but would not make an appreciable difference burning at 50-100 feet.

I'm sorry but it does make a big difference in all ranges from short to infinity, It let's you make the spot the smallest it can be at that distance, Why would you think it would only effect the short range but do nothing at 50 and up ?......

I think the best use of funds would be in finding a 6X BE with a 2.5 inch wide objective and good machining, the perpendicular alignment of higher power BE will need to be very good and uniform across it's adjustment.

Well that all depends on what you want out of your laser, BE work well but they change a laser beam into a laser column coming out of the laser and I don't like that......

I'm assuming that a 6X lens with a 3X lens right after it would make 18X but maybe it doesn't work that way ???

 

[RedCowboy]

I was just looking there for a 3 lens set but did not see any, I do have their site marked.

I know you used to have 1 smaller concave in your mix, I will have to experiment with some and see, I have several LSP 6X pairs so I could stack 2 of my concaves and see how it effects the downrange compared to aperture line width.

 

[Accutronitis]

I was just looking there for a 3 lens set but did not see any, I do have their site marked.

I know you used to have 1 smaller concave in your mix, I will have to experiment with some and see, I have several LSP 6X pairs so I could stack 2 of my concaves and see how it effects the downrange compared to aperture line width.

Links to both sets are in my post above your post.....

 

[Alaskan]

Doesn't matter what they say the X factor is, none of them are what they say that I've been able to find yet, off by 1/3 less, usually. All I need to know is the diameter of the beam exiting the pointer within a few inches of it to calculate the expected divergence, provided the beam isn't converging and is at infinity focus.

 

[RedCowboy]

Quote:
Both these are 44's with G2's and 6X pairs and are fun with that static set up for the short range, moving the convex cyl like you do would fine tune a sweet spot in the short range but would not make an appreciable difference burning at 50-100 feet.

I'm sorry but it does make a big difference in all ranges from short to infinity, It let's you make the spot the smallest it can be at that distance, Why would you think it would only effect the short range but do nothing at 50 and up ?......

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I said it would not make an appreciable difference in the far field, that is your adjustment, not the lenses themselves.

At 10 feet you can adjust from infinity to very tight, but at 100 feet you can only adjust from infinity to slightly less than infinity with your adjustment of the convex cylindrical.

You can't make a spot at 100 feet that's as small as you can make at 10 feet.

Now I am not saying that you cant mal adjust it then focus it, I am saying the difference between infinity focus and a 100 foot focus is no where near as appreciable as an infinity focus adjusted to a 10 foot focus.

 

[CDBEAM777]

Well...Zippy ...being a man of Science has calculated the answer...See the pic !!! :wtf::wtf:

BTW...Uranus average distance from Earth is 2.9 Billion Kilometers....Mmmmm Fascinating !!!

Ya...I know...whada waste a bandwidth ! However....really....the " Zippy Humor "...is....well....PRICELESS....SO....it is well worth the Bandwidth !!!!!
Infantile...yet....mmmmm..." Spot On " hahah


Later...CDBEAM:san::san:

 

[Accutronitis]

whada waste a bandwidth

You can say that again, If you can spare the bandwidth.......

Now I am not saying that you cant mal adjust it then focus it, I am saying the difference between infinity focus and a 100 foot focus is no where near as appreciable as an infinity focus adjusted to a 10 foot focus.

Oh yes, Now I understand what your saying.

I was just looking there for a 3 lens set but did not see any, I do have their site marked.

No they don't, I bought both sets of two lens to get the lenses I'm using now.....

moving the convex cyl like you do would fine tune a sweet spot in the short range but would not make an appreciable difference burning at 50-100 feet.

Well if you setup a fixed set of cyl lenses for a sweet spot in the short range being able to move the convex cyl will make a big difference at 50 feet but if you have a fixed setup for infinity focus it won't make much difference at 50 feet BUT again it will make a big difference at 1 foot, Now that I can adjust that lens i'll never be without it !


So far this setup has given me the most power at 50 feet with the smallest spot size BUT I still want a 3X BE to use with my 4X cyl lens setup......

 

[steve001]

I'm assuming that a 6X lens with a 3X lens right after it would make 18X but maybe it doesn't work that way ???

Why? It doesn't. It's additive 6+3=9.

 

[Accutronitis]

Why? It doesn't. It's additive 6+3=9.

There we go ! That's why it's only 8mm wide on the fast axis ! I was only going by what Milos had said in a diff thread when he put a 3X with a 4X and called it a 12X setup.......

@ Accutronitis: Yea I always judge short on distance, my back corner of my yard I guessed at 75 feet from my window, it's actually 105 feet and I have lit bags there with my moped muffler build, one thing you can do is soak down an area if you are going to be testing there, it's a lot better than running out the door yelling OH CRUD, not that I have done that, I haven't....well not with lasers, but I fear ever letting something get out of hand so I play it extra safe, it's worth the effort.

Actually you have a very good eye because what I thought was 50 feet was really 40 feet !

 

[RedCowboy]

I just read this and I think we are making good progress, a physically wider lensed beam expander to use after our correction of the 44's aggressive axis would definitely be welcome and get all of our power minus parasitic losses downrange.

I posted this on the other thread but it applies and I think wider lensed beam expanders could be very useful with our repurposed light source diodes in the future as well, just the 3X BE works with a lot of the GBall diodes with the ball lens intact.

Anyway I like the wider expander concept and I know Alaskan has built some, if we can come up with the right lenses to order and use with PVC pipes that will slip over each other I think we can get results on a budget as well.


Here it is from the 81 foot end as my camera is ready to be replaced.

I'm enthusiastic about this expander, you want to aim for 80% I think but if it works man it works, see if you get wings or not, even if you do you can cheat into the wings a little to get a hotter spot, I have a bunch of optics too and as I understand it uncoated optics waste 5% but again it will be worth it, if we could order about a 3 inch wide objective or whatever fits tight into 3 inch PVC then use a cap and cut in for the concave....actually if we can find inner diameter and outer diameter in a large size to slip over and slide that's snug it should be good and dimensionally stable as it will be strong, and a real working 10X would be awesome on top of our radical axis correction.

I would like to make a 12 watt HH from 2 x NUBM44's combined via PBS cube with a wave plate and as big of an expander as possible.
The 2 diode block fits into the flashlight housing and the BE cover slips over the optics block.

-----edit------

I have trays of scavenged lenses and a few other larger ones, but not so many concave/double concave and rather than trial and error I would like to learn how to calculate what we need, I am good with numbers and math it's lenses that I am not up on all the technical terminology and numeric measurement of their shapes so as to know how to order AR coated lenses that can get expensive.

I may try some more trial and error, really a sanwu 3X input with the focusing end removed and mounted in a length of PVS a wider longer FL lens could be an easier way to start searching.

Ebay has a lot of inexpensive lenses as well, even some VIS coated stuff, we are going to have to build some big expanders.

 

[paul1598419]

I won an auction on eBay for a 445nm cylindrical lens trio from Newgazer. It has a middle lens that corrects for the 90 degree axis from the other two lenses. Has anyone else gotten or seen these lenses? Mine should be here tomorrow. I figured it wasn't a bad deal for $26.00.

 

[RedCowboy]

I have only seen them on ebay, I would test a set if can get then at a deal like that, I don't know about the quality but it could be good enough so I will have to put in some bids and try to snipe a set, I have seen gazer selling 44 diodes but they are likely used machine pulls, still if I can get both those items cheap a trio triangle build I have been planning may have to be build, LOL a Trio Triangle Triple corrective lend build. The " 3T-cheapie "

 

[Accutronitis]

I won an auction on eBay for a 445nm cylindrical lens trio from Newgazer. It has a middle lens that corrects for the 90 degree axis from the other two lenses. Has anyone else gotten or seen these lenses? Mine should be here tomorrow. I figured it wasn't a bad deal for $26.00.

No I've never seen anything about them, Do you have a link ?

For $26 dollars how can you go wrong ? Unless they are made out of plastic that is, lol

 

[paul1598419]

Is anyone selling brand new NUBM44s? I mean never been soldered on with full length pins? I got mine from Ricker and it came out of a pull.

 

[Accutronitis]

I don't know if the 44 I got from DTR was brand new, I only know I really wanted it and I'm glad I got it ! lol

After all the work I put into it the beam output is under control now and it's power is sometimes a little scary ! just image nearly 7 watts focused down to smaller than a head of a pin at a few feet ! A little scary......

Even fully cured gloss white epoxy paint is no match for that kind of power in such a small spot, A flame instantly jets out from the surface under that !