Another project red?

[andy_con]

the two lens/optics i just posted above are used to combine multiple beams into a single usable beams, the two optics together cost £60, which isnt to bad.

but for mech proposal there is a better way of doing things when it comes to combining lots of beams.

[buffo]

the two lens/optics i just posted above are used to combine multiple beams into a single usable beams

Andy, do you have any pictures (or better yet, real-world measurements before and after) of these two lenses? I don't remember you having these installed in your projector, but I may have missed it. Would be very interested in hearing about any personal experiences with these two lenses.

but for mech proposal there is a better way of doing things when it comes to combining lots of beams.

And that would be.?.

Adam

[mccarrot]

Dallas, TX.
I have done work for a certain forum member who can vouch for my quality. Although he won't be able to speak for about a week because I just shipped him the parts today.

With good lensed there is no need to shrink the beams together, the 650mW reds I resell are made with 4 diodes and have a beam of 2,5 x 2,5mm x 0,7mrad.

It makes no sense to use a telescope to reduce the beam size of crappy lenses.Start at the beginning, and get a small as possible beam to start with.

[Laserman532]

Not to derail the thread again, but i would like to apologize to mecheng3 firstly and most profusely for my negative nilley post of "you can lead them to water". Secondly to anyone who may have been exposed to my venom spewed imparting unnecessary drama. Thirdly to andycon for any disrespect which I may have imparted. I was having a very bad day and today is not shaping up any better, thats no excuse only an explanation. No need to acknowledge this post (and continue dis rail), but please excuse my ignorance..if i could delete it, I would.... carry on...

[daedal]

Misterwilling - where are you located? If Daedal's new mirror mount idea pans out, it might be cool to get a few machined to see how they work in real life...

Adam

If this does work, and if we will be machining the hex but, I see the benefit of making the sides with varying angles (one at vertical 45 degrees, one at a horizontal 45 degrees). Since the nut can be flipped, only one angle of each needs to be made.

Also, as opposed to using regular screws, we could use headless screws with a flathead slot at the top. The bottom screws can be flipped around so the base angle can be adjusted from the top, and so can everything else.

--DDL

[daedal]

Andy, do you have any pictures (or better yet, real-world measurements before and after) of these two lenses? I don't remember you having these installed in your projector, but I may have missed it. Would be very interested in hearing about any personal experiences with these two lenses.

Adam

I would be interested in this as well...

--DDL

[andy_con]

Andy, do you have any pictures (or better yet, real-world measurements before and after) of these two lenses? I don't remember you having these installed in your projector, but I may have missed it. Would be very interested in hearing about any personal experiences with these two lenses.
[/FONT]
And that would be.?.

Adam

if you come to a future uk meet you are likely to see these lens on a new projector.

8 diodes (in 2 rows of 4) about a 3mm/1mR beam
15 diodes (in 3 rows of 5) about a 4.5mm/1mR beam
24 diodes (in 4 rows of 6) about a 6mm/1.2mR beam

thats using roithner GS-7020H lens

mccarrot

With good lensed there is no need to shrink the beams together, the 650mW reds I resell are made with 4 diodes and have a beam of 2,5 x 2,5mm x 0,7mrad.

It makes no sense to use a telescope to reduce the beam size of crappy lenses.Start at the beginning, and get a small as possible beam to start with.

agreed for 4 diodes no additional lens are needed

[MisterWilling]

thats using roithner GS-7020H lens

agreed for 4 diodes no additional lens are needed

With good lensed there is no need to shrink the beams together, the 650mW reds I resell are made with 4 diodes and have a beam of 2,5 x 2,5mm x 0,7mrad.

The lenses I bought were single element high transmission AR coated with a loss of less then .3% . So I was only thinking about power output when I bought them and unfortunately I forget about beam diameter. Forgive me as I am just getting out of the laser pointer world and into scanners.
What lenses do you recommend? And how much do they cost per lens. I have the equipment to make my own lens assemblies if I can get them bare for a cheaper price. I know I have heard people using Lens27.

Offtopic: @ mccarrot : Did you ever have time to look for those aluminized scanner mirrors?

[andy_con]

The lenses I bought were single element high transmission AR coated with a loss of less then .3% . So I was only thinking about power output when I bought them and unfortunately I forget about beam diameter. Forgive me as I am just getting out of the laser pointer world and into scanners.
What lenses do you recommend? And how much do they cost per lens. I have the equipment to make my own lens assemblies if I can get them bare for a cheaper price. I know I have heard people using Lens27.

Offtopic: @ mccarrot : Did you ever have time to look for those aluminized scanner mirrors?

well the 7020H is only like £3 per lens, it only has a plastic lens, but gives far better output power than a standard aixiz lens and aixiz glass lens. it also produces a small beam than both aixiz.

the lens27 is about £20 per lens, but it is amazing and the results are fantastic.

[daedal]

well the 7020H is only like £3 per lens, it only has a plastic lens, but gives far better output power than a standard aixiz lens and aixiz glass lens. it also produces a small beam than both aixiz.

the lens27 is about £20 per lens, but it is amazing and the results are fantastic.

Andy, would you happen to have one of the lens27 collimators? I'm assuming you have access to the 7020H lens, but if you could compare the two, against the AixiZ lenses, we would all be very greatful. £3 per lens is a great price if the lens truly proves better than the AixiZ glass lens. I believe the AixiZ glass lens is a multi-element assembly.

Thanx;
DDL

[MisterWilling]

Well I paid the same amount for the lenses I bought all ready. I will resell them back and go for the Lens 27 then. Thanks for all the info guys. Sorry if this if off topic.

Yes the aixis glass is a 3 element lens. Thats why it has 20% loss even though its AR coated.

[andy_con]

Andy, would you happen to have one of the lens27 collimators? I'm assuming you have access to the 7020H lens, but if you could compare the two, against the AixiZ lenses, we would all be very greatful. £3 per lens is a great price if the lens truly proves better than the AixiZ glass lens. I believe the AixiZ glass lens is a multi-element assembly.

Thanx;
DDL

i do not have any lens27, but i do have standard aixiz, glass aixiz and 7020h lens.

when i get time ill try get some info for you

[daedal]

i do not have any lens27, but i do have standard aixiz, glass aixiz and 7020h lens.

when i get time ill try get some info for you

Thanx a bunch man

--DDL

[ElektroFreak]

Well I paid the same amount for the lenses I bought all ready. I will resell them back and go for the Lens 27 then. Thanks for all the info guys. Sorry if this if off topic.

Yes the aixis glass is a 3 element lens. Thats why it has 20% loss even though its AR coated.

One thing people fail to give credit to the three-element lens for is the most important feature of such an arrangement: Beam quality in the far field

With diode lasers that use single-element lenses I have found that the beam quality decreases with distance from the laser. About 50m away from a diode laser with a single element lens and the beam is a misshapen splotch rather than a nice elliptical beam. With the Aixiz multi-element lens, I get a nearly perfect circular spot even at great distances away from the laser. IMO, this outweighs the power gains to be found in single-element coated glass lenses.

[andy_con]

One thing people fail to give credit to the three-element lens for is the most important feature of such an arrangement: Beam quality in the far field

With diode lasers that use single-element lenses I have found that the beam quality decreases with distance from the laser. About 50m away from a diode laser with a single element lens and the beam is a misshapen splotch rather than a nice elliptical beam. With the Aixiz multi-element lens, I get a nearly perfect circular spot even at great distances away from the laser. IMO, this outweighs the power gains to be found in single-element coated glass lenses.

maybe so but with the roithner lens you get a smaller beam at apeture and far field.

the standard aixis and glass aixis lens both produce the same size beam.

[badger1666]

i wonder who makes the lens aixiz use, as roithner stock both of them as well ??

[ElektroFreak]

A smaller beam at aperture means greater divergence.. there are ways around that, though. Really, the truth is that if you're doing shows beam quality is nearly irrelevant other than divergence. I'm just a sucker for really clean, high-quality beams..

[badger1666]

@mccarrot
what lens did you use to get .. 4 diodes and have a beam of 2,5 x 2,5mm x 0,7mrad.

thanks

[daedal]

the standard aixis and glass aixis lens both produce the same size beam.

I have seen a major change between the AixiZ acrylic vs the glass lens personally in the overall beam shape, quality, and divergence across the fast axis and slow axis.

--DDL

[andy_con]

I have seen a major change between the AixiZ acrylic vs the glass lens personally in the overall beam shape, quality, and divergence across the fast axis and slow axis.

--DDL

really the glass aixiz i have here are poo

[MechEng3]

I have had a good experience with the Aixiz lenses...but they make a fatter beam. The 2 Melles collimators I have are just unreal....@ $ 241 each. I picked them up used for a song....unknowingly they were that good. The basic idea was to keep costs down, readily available parts...most of them, and get others involved. My idea was to incorporate the Aixiz lens and the diodes in a .5" T-6 ally bar. 6 bars holding 2 diodes each. 3 pair offset diodes for H pol and 3 pair offset for V pol. The method of getting the overlap is critical to the output size. Look at the grouping pattern. Like looking onto a cleaved cable full of tightly packed strands.....I will need to draw up the block sections in detail...then it will be clear. Mr willing can your machines read from Alibre? I can output it in G code or most any format you need...if you want to make a few parts. I can usually get on a Hass machine somewhere but not anytime soon. I also though of doing the blocks in copper and ally sub- base plate...the diode blocks will be tapped for the lens and machined 5.6 mm for the diode. I will try and get something sketched up soon. The theory works....there are magic numbers on the diodes to combine most tightly. 4,5,9,12....you get the idea here.Also there is a very small amount of steering ability with the lens...secured with adhesive when aligned. The mirrors are from the sleds...best of all they are a free by-product. The H pol would be stacked and knife edged...the V pol would be the same. Rather simple if you study the original drawing and contemplate the outcome.The lens 27 may be nice...but I would like to keep the cost down on the project...this invites more thinking and being resourceful. If the block are to be machined from aluminum , I may be able to donate enough to make 4 or 5 lasers. I will have to check my materials at home. The baseplate will need to be 9mm or a bit thicker and the bottom of the laser can be .25" A single 40mm TEC can handle the cooling chores...most this size is enough Q. As for the mirror mounts...solid round stock....only pivoting about an offset drilled hole for a socket head machine screw...the tilt can be facilitated into a loose slot and adhesive to set the angle. Thought up a way to stress the shaft by slitting the side and a set screw in the top would adjust the tilt. But then it would have to be attached from the bottom making an assembled laser a pain to adjust. Still planning...thanks for the push! Is there a lens 27 GB in the near future?? What about a lasorb GB? Does anyone work with 0-80 size threading machines? If so a few of the tiny mm-1's could be made up...1/4 x 1/4.

[MisterWilling]

My machines read g code. However, if you just give me simple sketches I can draw it up and write my own code for my cnc machines. That's no problem. I also can do 0-80 tapping.
I have just built a large quantity of the brass adjustable mirror mounts and those seem to be the most stable out of all other options. They are an excellent design to make and utalize 60 tpi adjusters. Only issue I have with those is they are not my design and I would have to consult with other individuals before mass producing them.
I personally have made my own copper modules for housing diodes similar to the aixiz ones and found it not necissary if you are using TECs. It can have it's benefits without a tec but not worth the time and effort when you can the aixiz mounts for under $2.

I am interested in a lens27 group buy. Although in their price list they have 1-49 pieces of the bare lens for $27, and $34 for 1-49 pieces of the lens mounted. I have the equipment to make my own lens housing but threading m9x.5 is a pain in the ass. I used to do it for a guy and never really made much money off it for the time I spent making them.

[edison]

If you want to have good beamspecs ask Marco or Mccarot. Here,s the link with information about these lenses.

Marco has also a positive driver but you need 4 of these. KL79 has a picture of it i think.

http://www.photonlexicon.com/forums/...ght=collimator

[mccarrot]

@mecheng3

If I where you I would do it good (with good lenses) or don't do it at all.

Also when you use the lens 27, they have just metric screw in threat for lens adjustment, this is in mu opinion not fine enough for a multi diode setup because you will get alignment issues with that many diodes.

My lenses got very special fine threat for very fine adjustment of the lens and no need to secure it, a stable and thin beam is mandatory for a multi diode setup.

I think spending some more money on quality lenses will safe you allot of trouble.

[MechEng3]

OK then lets have a multiple purchase price...so maybe we can get a GB going on this lens. I have found a very attractive lens at Optics online...FL 4mm NA .6 BFL 2.4mm .25 dis DBAR 400-670nm. Ican machine my own fine thread holder...but lets see your prices so we can have a breakdown of what lenses are available....quality vs. pric. Thanks!