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Old 05-11-2012, 09:24 PM #1
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Default Best Lens for LPC-826 diode?

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


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Old 05-11-2012, 09:38 PM #2
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Default Re: Best Lens for LPC-826 diode?

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.
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Old 05-11-2012, 09:41 PM #3
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Default Re: Best Lens for LPC-826 diode?

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?
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Old 05-11-2012, 09:44 PM #4
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Default Re: Best Lens for LPC-826 diode?

Quote:
Originally Posted by daawood123 View Post
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 ?
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Old 05-11-2012, 09:45 PM #5
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Default Re: Best Lens for LPC-826 diode?

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
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Old 05-11-2012, 11:47 PM #6
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Default Re: Best Lens for LPC-826 diode?

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.
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Old 05-12-2012, 02:03 PM #7
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Default Re: Best Lens for LPC-826 diode?

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
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Old 05-12-2012, 02:14 PM #8
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Default Re: Best Lens for LPC-826 diode?

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

Jim
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Old 05-12-2012, 02:21 PM #9
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Default Re: Best Lens for LPC-826 diode?

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
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Old 05-12-2012, 02:26 PM #10
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Default Re: Best Lens for LPC-826 diode?

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

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Old 05-12-2012, 02:44 PM #11
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Default Re: Best Lens for LPC-826 diode?

Quote:
Originally Posted by daawood123 View Post
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.
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Old 05-12-2012, 02:46 PM #12
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Default Re: Best Lens for LPC-826 diode?

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
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Old 05-12-2012, 02:52 PM #13
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Default Re: Best Lens for LPC-826 diode?

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)
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Old 05-12-2012, 02:56 PM #14
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Default Re: Best Lens for LPC-826 diode?

thanks stix. i was almost about to buy the spring from survival, fate stopped me.
thanks again
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Old 05-12-2012, 04:15 PM #15
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Default Re: Best Lens for LPC-826 diode?

You can get a complete Aixiz module for less. It already contains a spring.
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520nm 55mW Skylaser PL520
532nm 821mW Skylaser PL532, 133mW Jetlasers Ti-B
589nm 100mW PGL-III-C-589
635nm 70mW Sanyo SenTorch
638nm 175mW Ehgemus, 1W Rook
660nm 1216mW Skylaser PL660, 263mW LPC826 C6
685nm 33mW Fujitsu FLD6A2TK C6
780nm 150mW Dilda
808nm 640mW C6

I have copper 501B and Dominator lasers for sale !
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Old 05-12-2012, 04:18 PM #16
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Default Re: Best Lens for LPC-826 diode?

Quote:
Originally Posted by daawood123 View Post
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.

Quote:
Originally Posted by daawood123 View Post
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.

Last edited by DTR; 05-12-2012 at 04:21 PM.
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