Red diodes and collimators.

[andy_con]

i think lens27 are the once im refering to, but ive not got any to test

[shrad]

lens27 are a good alternative at a decent price/quality ratio

then, if you have some more bucks to put on that thing, go for some high quality short focal aspheric lenses at $82/piece from thorlabs

[badger1666]

i built a multi red using the glass aixiz ended up with a 5x5mm beam
you could always overlap the beams a little and it wont make much of a difference to the output power

theres certainly no need for an 8x8 beam

But what are the beam specs with these lenses, to build a quad setup a tiny beam is mendantory.

I have seen aixis glass lenses who gave a 4mm beam, combining these will give a 8x8 beam minumum, this will be pritty useless as you will loose half you power on the galvo mirrors.

The lenses I use give a beam of 1,2x2,2mm, combining these will give you a beam of 2,2mm in theory (2,5mm in real live due to combiner cube etc.) But those lenses are really expensive, so if you can find a cheaper lens with good beam specs i'm very interested.

[marco]

Hello Shrad,

i can offer this "magic" lenses complet with a collimator (dia. 11x12mm) for
just 39,- Euro We also have a version for 405nm / 445nm Dioden !
They work much better than any 3 lense design, the losses are very
small so that you get full power from the LD at rated current.

There wil be soon distributors in Europe and USA - more details will follow.

greetings,
marco

lens27 are a good alternative at a decent price/quality ratio

then, if you have some more bucks to put on that thing, go for some high quality short focal aspheric lenses at $82/piece from thorlabs

[shrad]

what are the dimensions of your diode barrels? it's interesting as I have two 642nm diodes waiting for a better collimation solution

[badger1666]

what are the dimensions of your diode barrels? it's interesting as I have two 642nm diodes waiting for a better collimation solution

use aixiz mounts and lens 27'S i got an awesome beam from mine , and loose the pbs cube and knife edge the beam, and lighn up far field with a slight overlap and you will be sorted loook at mine

[shrad]

yes, that would do the trick, but I have Pat's kit now, and I'll keep the design as it is

that way I'll have approximately a 2.5mm beam diameter, slightly cross-shaped but I don't care... I like the cube technique anyway

[marco]

Hello Shrad,

they are made for 5,6mm diodes - normaly they will be pressed by a tool
to have good thermal contact, but you can also use some thermal conductive
glue. The is also a version with dia 11 x 16mm for a lense with longer focal length
wich can be usefull when combining a larger number of laserdiodes.
With these collimators the beamprofil will not be round, so you can use mirrors
to combine the single beams.
By they way - this is not some surplus stuff, they are made by us for some industrial
applications. Soon there will be some more collimators for other diodes and also some
smaller version.

greetings,
marco

what are the dimensions of your diode barrels? it's interesting as I have two 642nm diodes waiting for a better collimation solution

[shrad]

hi marco!

20mm diameter collimators would be the best for me, but I think you wouldn't make those I'll stick with my 18mm ones with a copper ring to avoid damaging the barrels with the retaining screw... the rings are ready to be bought, I already found some tube of correct diameter and so...

[marco]

Hello shrad,

sorry, but 20mm is to large. We build this collimators for our industrial products, so they
are NOT surplus - at the moment there are two versions with dia11x12mm and dia 11x16mm
which could be used with different lenses with focal length of 4-8mm depending on the application.
Sonn there will be some more collimators, a smaller dia 8mm version and a larger advanced version
with non rotating lense and the option to mount the diode by a retaining ring.

The only option would be to make an adaptor with dia20mm and an 11mm bore.

greetings,
marco

hi marco!

20mm diameter collimators would be the best for me, but I think you wouldn't make those I'll stick with my 18mm ones with a copper ring to avoid damaging the barrels with the retaining screw... the rings are ready to be bought, I already found some tube of correct diameter and so...