Diode help?

[oliverst14@hotmail.com]

can i jib in here and just ask what else is required other than one of these diodes, the mount with lens built in and im guessing you need a heat sink too. im wondering why diodes cost so much if thats all there made up of.

also does this heuursciences have green and blue raw diodes as well? im thinking of building my own diodes and building a 10 watter or summit if i can get a 1watt 635 for what sounds like about $200

can someone put me straight cause im sure this cant be the whole story. if it is there will be an extremly bright laser in my possesion very soon hehe

[ElektroFreak]

Ummm... LOL?????? I guess.?.? good luck with the green diodes.. that all I can say about that.

[oliverst14@hotmail.com]

im guessing that means there is more to it than i think???? lol im guessing ur refering to the diode part (module then)

[ElektroFreak]

With these diodes there is a bit more to it, yes. The concept of a laser diode is simple, and with singlemode diodes collimation is simple (just a convex lens will do a good enough job) but with multimode diodes like these the game changes a bit. There's some very good info to help you understand what I mean on the first page of this thread.

I think you might be calling DPSS lasers "diodes" which is not entirely correct. All green lasers currently available for laser shows are DPSS rather than diodes and are MUCH more complex that just a diode.

As I stated on the first page, the minimum requirements for collimating a multimode diode is a cylinder lens for the fast axis and a convex lens for final collimation. Also, you would need to fabricate mounts for the diode and optics and any TECs that you will use, etc.

[oliverst14@hotmail.com]

just to show u its not impossible have a look at this

http://www.crunchgear.com/2009/07/27...n-laser-diode/

[oliverst14@hotmail.com]

basically ur saying this is fairly simple for red and blue but green is another story?

oh well ill just carry on buying em then i suppose. lol thought it was too good to be true lol

cheers mate

[T0mmm]

basically ur saying this is fairly simple for red and blue but green is another story?

oh well ill just carry on buying em then i suppose. lol thought it was too good to be true lol

cheers mate

If you google for something like 'inside a green DPSS laser' etc, then you'll be able to read up about it, sams laser faq is like the bible of lasers; tons of info

there currently arent any green diodes (other than a brand new 510nm one which is really new, shit, and probably costs an arm and a leg), the way the 532nm light is made is by basically passing 808nm light from a big IR diode through a crystal which frequency doubles the light to 1064nm, then through a KTP crystal to convert that light to the green 532nm light

a diagram of it is here http://www.walshcomptech.com/repairfaq/sam/l54-101.gif


blues work in a *similar* way, i.e. using crystals etc, but from what i understand they are more expensive because of the coatings on the various optics; specific operating temperatures for the KTP crystals; and they need more precise alignment (and so better machined parts)


..easy really!

[smogthemog]

Andy I have this if your interested?

Make me an offer if you are. They are Meredith 5/9mm mounts, mounted and insulated on a block of ally with a red PBS cube attached. I also have the mirror somewhere too

[FourDee]

If the diodes are case positive, they don't even have to be insulated from each other for use with the die4drive, but the base plate for the 2 diodes will have to be insulated from the main base plate

[andy_con]

Andy I have this if your interested?

Make me an offer if you are. They are Meredith 5/9mm mounts, mounted and insulated on a block of ally with a red PBS cube attached. I also have the mirror somewhere too

thanks for the offer jim, but i dont think they have the right lens for the diodes i have.

unless someone says different

No FAC lens there.. If there was, the output would be a much thinner rectangular line compared to what we see there.. Also, the fast axis will be perpendicular to the plane of the pins. If the pins are vertical (very close in the pic), the fast axis will be horizontal. Based on that you can tell that the fast axis has not been collimated at all.

Just for reference I'm posting a picture of a cmount diode with FAC lens so you can see just what a FAC lens looks like. It is a piece of single-mode fiber placed across the diode facets. The cylindrical shape of the fiber makes it act like a cylinder lens. Occasionally I've heard of 9mm diodes having integrated FAC, but the VAST majority of the time they do not.



EDIT: I forgot to add that Chris sells multimode diode collimating lens assemblies that are specifically for this purpose. I have one myself, but I haven't tried it out yet, so I don't know firsthand whether or not it would be good enough for a low-divergence beam.. worth a try, perhaps.

many thanks for your help and info

whos chris?