Old 08-15-2010, 06:25 PM #1
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Default Dirty lens ?

Hi guys, i think the exit apeture lens has become dirty, on the left my 445 build , and on the right the 445 handheld build ...the uncollimated of course so you can see the problem..ive tried everything to clean it..i even have a special solution to clean mobile phone lenses without streaking, put some on a cotton bud, no difference...nothing is shifting it...any ideas?




Last edited by ped; 08-15-2010 at 06:27 PM. Reason: re sized pic
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Old 08-15-2010, 06:28 PM #2
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Default Re: Dirty lens ?

compressed air cans used for cleaning pcs.
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Old 08-15-2010, 06:28 PM #3
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Default Re: Dirty lens ?

It sounds like there is something on the diode window if you've cleaned the lens and it hasn't done anything. Either that or there is something on the back of the lens. If it's the diode window, there's a chance it's become burned onto the window and the only way to fix that is to decan the diode.
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Old 08-15-2010, 06:45 PM #4
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Default Re: Dirty lens ?

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Originally Posted by Prototype View Post
If it's the diode window, there's a chance it's become burned onto the window and the only way to fix that is to decan the diode.

Burned onto the window...never thought of that...im trying to avoide de canning as its in a custom press fit...be a bugger to get out without damaging it
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Old 08-16-2010, 12:20 AM #5
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Default Re: Dirty lens ?

I have a diode that the raw output looked like that. The can was damaged.


I don't have a picture with the raw output but here it is with a lens on backwards.
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Old 08-16-2010, 12:57 AM #6
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Default Re: Dirty lens ?

Dirty Lens?

Clean it up... with Orbits
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Old 08-16-2010, 01:24 AM #7
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Default Re: Dirty lens ?

With no lens my 445nm has a couple of spots, that I like to think of as floaters. They aren't at all visible when the laser is focused, although then the "wings" are.

I cleaned my Aixiz Glass lens with rubbing alcohol and lightly dried with the corner of a paper towel. I feel like there was already a thread about if this was alright to do. I can't remember if anyone said that the alcohol would definitely make the AR coating come off but after two rinses my coating is still visible and my lens was definitely a lot cleaner.
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Old 08-16-2010, 01:28 AM #8
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Default Re: Dirty lens ?

Alcohol should not make a AR coating come off unless you are rubbing very hard aginst the coating, or it was a bad coating job to begin with.


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With no lens my 445nm has a couple of spots, that I like to think of as floaters. They aren't at all visible when the laser is focused, although then the "wings" are.

I cleaned my Aixiz Glass lens with rubbing alcohol and lightly dried with the corner of a paper towel. I feel like there was already a thread about if this was alright to do. I can't remember if anyone said that the alcohol would definitely make the AR coating come off but after two rinses my coating is still visible and my lens was definitely a lot cleaner.
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Old 08-16-2010, 01:37 AM #9
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Default Re: Dirty lens ?

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Originally Posted by Flaminpyro View Post
Alcohol should not make a AR coating come off unless you are rubbing very hard aginst the coating, or it was a bad coating job to begin with.
OK Thanks, I just found a thread at CPF that pretty much said the same thing. Good info!

I plan to upload a pic of my diode's output without a lens later tonight, for all to see the floaters.
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Old 08-16-2010, 09:06 PM #10
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Default Re: Dirty lens ?

Ok just an update.

I de canned my diode...




And waheyy..



Ive said before and i'll say it again, im astonished the level of punishment these diodes can take.

Thier like chuck Norris...

Just not as hard.
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Old 08-16-2010, 11:00 PM #11
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Default Re: Dirty lens ?

great decanner ;-)

So was the window visibly damaged?
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Old 08-17-2010, 08:15 AM #12
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Default Re: Dirty lens ?

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great decanner ;-)

So was the window visibly damaged?
It had a dark spot right in the middle of the window...nothing was shifting it

To de can i set the cordless drill to rotate slowly CCW , and the cutter went fast CW , worked like a charm.
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Old 08-17-2010, 08:43 AM #13
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Default Re: Dirty lens ?

you used a dremel to de-can your diode?
then you are more brave then i am, i know i would have cut the die in half to if i did
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Old 08-17-2010, 10:43 AM #14
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Default Re: Dirty lens ?

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you used a dremel to de-can your diode?
then you are more brave then i am, i know i would have cut the die in half to if i did

TBH i had nothing to lose..the diode was no use as it was...and i took it VERY carefully..and held my breath
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Old 08-17-2010, 01:46 PM #15
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Default Re: Dirty lens ?

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Originally Posted by ped View Post
TBH i had nothing to lose..the diode was no use as it was...and i took it VERY carefully..and held my breath
gratz on the job then
i usually take fine and sharp knife and cut around the can ( i did kill a few this way )
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Old 09-18-2010, 10:48 PM #16
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Default Re: Dirty lens ?

Try cutting pliers with the diode secured in a vise. I've tried on red LCC's, and its surprisingly easy just to sort of peel the entire can off, no need to cut/grind through it all around.

Somehow i wouldn't have even tried the dremel... metal dust/scrapings flying all over the place in whats soon to be an open can diode.
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