Best Lens for LPC-826 diode?

daawood123 · May 11, 2012

Hi.
Im pretty much in the middle of my first ever laser build, and I've done the hard bit of soldering the diode to the driver and I've tested it and the laser works, just need to work on the host so i can put the assembly in the host.

However, when i got the diode in the aixiz module from Blord, I took the lens out and it fell, spinning in the air, so I dont know which way its meant to be threaded in, so will it matter which way the lens is put into the aixiz module?

and lastly, I know that standard aixiz lenses will melt under high power lasers, and this laser is being driven at 456mA, so it should be putting out around 300mw, and I dont know too much about lenses, but what lens should i get?
I dont want to get a g1/2 just yet, anything like $10 would be great. I'v found 3 element, but would this be ok? also, where are some good places to get this 3 element thing from.

Remember, its for a red laser.

Thanks

Blord · May 11, 2012

The acrylic lens works fine with the 300mW of the LPC826. This single lens gives better beam profile than the 3-element glass lens. You will notice less scatter around the dot.

The lensbarrel has a retainer ring for the lens. That side goes in first.

If you must buy a lens look for the 405/445nm 3-element glass lens. You will need that for future build but it works fine with red laser.

daawood123 · May 11, 2012

thanks. so the lens wont melt? one side of the lens barrel has 2 notches in it, another side has a smaller black ring thing in the middle, im supposing that this is the retaining ring and goes in first?

also, iv noticed that the ghostdrive gets sooo hot, like in 2 seconds its like 100 degrees celsius. how do i heatsink it? shall i just fold strips of coke can around it?

Blord · May 11, 2012

daawood123 said:
thanks. so the lens wont melt? one side of the lens barrel has 2 notches in it, another side has a smaller black ring thing in the middle, im supposing that this is the retaining ring and goes in first?

Yes, the side with the small black ring. Didn't I put a focus ring on the barrel ?

daawood123 · May 11, 2012

you did, but my curiosity got the better of me and i took the lens out, then it slipped and fell. so i had no idea which side was the right onw

cheech226 · May 12, 2012

the 3 element 650nm lens does a nice job and allows a bit more power thru than the acrylic. i like it's "spot" better than the g-1.

daawood123 · May 12, 2012

where can i get the 3 element for red lasers though.

also, i have noticed that the lens assebly is very wobbly, after adjusting the lens moves forward/backwards and so it is really hard to focus, I read somewhere that a spring for the lens will add tension, also teflon tape can be used, where can i get this spring from though, survival lasers is selling one for $5 which i think is a bit expensive

jimdt7 · May 12, 2012

I have a G1 635nm lens, i can give it to you for 40$ if you want :beer:

Jim

daawood123 · May 12, 2012

sorry, i dont have the money to spare and i dont want a g1/2 yet, a casual glass will do. im not even sure if this build will work when finished, so dont want to drop $40 on a g1 if i have no laser

jimdt7 · May 12, 2012

Whatever you want no prob, if you need anything else pm me i might have it !

Jim

DTR · May 12, 2012

daawood123 said:
where can i get the 3 element for red lasers though.

also, i have noticed that the lens assebly is very wobbly, after adjusting the lens moves forward/backwards and so it is really hard to focus, I read somewhere that a spring for the lens will add tension, also teflon tape can be used, where can i get this spring from though, survival lasers is selling one for $5 which i think is a bit expensive

I have the three element lenses for red and 650-G-2's.:beer:
https://sites.google.com/site/dtrlpf/home/glass-lenses

daawood123 · May 12, 2012

yeah, i tried buying it from you, even though i have the right amount of money in my account, it said that you could complete this transaction

Stix62 · May 12, 2012

Daawood - Regarding a spring or teflon tape (PTFE tape in UK), the tape is a much better choice i.m.o. A spring will 'firm' things up a bit but it still tends to wobble from side to side. (mine always have so I don't use them).
Nearly $6 is a ridiculous price for a spring; I've got a spare one if you want it. (tape is better though

)

pm me your addy again and I'll send it your way.

(freebie)

I'll chuck you in some decent heatsinking material too - though you'll need a file and a hacksaw to cut it to size

(have you got thermal adhesive? - you'll need some)

daawood123 · May 12, 2012

thanks stix. i was almost about to buy the spring from survival, fate stopped me.
thanks again

Blord · May 12, 2012

You can get a complete Aixiz module for less. It already contains a spring.

DTR · May 12, 2012

daawood123 said:
yeah, i tried buying it from you, even though i have the right amount of money in my account, it said that you could complete this transaction

If you are having problems with the checkout system shoot me a PM with your email and I will shoot you an invoice.

daawood123 said:
thanks stix. i was almost about to buy the spring from survival, fate stopped me.
thanks again

If you grab a lens I will throw in a spring for you.

Also I do prefer teflon as well but you need to be careful. Just apply 1 1/2 wraps on the upper 1/3 of the lens threads so that it is just starting to thread into the module when the unit is near focused. This will reduce the risk of the teflon fraying and getting into your module which can and will damage your diode.:beer:

Best Lens for LPC-826 diode?

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