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Old 07-26-2016, 06:22 PM #1
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Default IR pumping diode replacement

Hi!
I built a laser pointer using DX "200mw" green laser module.
It was a good cheap laser and i paid it only 20 bucks.
Anyway, after trying to increase the current of the IR pumping diode,
i finally destroyed it

Since i am a machinist and i can deal with no problem with small precision parts, i have a question for you:
Is it possible to replace the pumping diode with a new one?
Will it work a 500mw 5,6 mm 808 nm IR pumping diode?
I know that the IR diode will cost like a new DX laser module, but i am pretty sad to put my module in the trash


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Old 07-26-2016, 07:07 PM #2
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Default Re: IR pumping diode replacement

Quote:
Originally Posted by Laser201698 View Post
Hi!
I built a laser pointer using DX "200mw" green laser module.
It was a good cheap laser and i paid it only 20 bucks.
Anyway, after trying to increase the current of the IR pumping diode,
i finally destroyed it

Since i am a machinist and i can deal with no problem with small precision parts, i have a question for you:
Is it possible to replace the pumping diode with a new one?
Will it work a 500mw 5,6 mm 808 nm IR pumping diode?
I know that the IR diode will cost like a new DX laser module, but i am pretty sad to put my module in the trash
Assuming the crystals sustained no damage from the increased pump power, then yes, it's possible to replace it. Is it worth it? Not so much... Wouldn't expect 200mW out with a 500mW pump either - best case is probably somewhere around ~150mW.
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Old 07-26-2016, 07:32 PM #3
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Default Re: IR pumping diode replacement

Asuming the diode was not an open can and was not butt pumping it (Diode emitter up against crystal) Then it may work but don't expect anything near 200mW. I have bought these in the past for my 50mW module and they were at least at the time right on spec. 5 6mm 500mW 808nm Infrared IR Laser Diode specially for Producing Green Lasers | eBay

Make sure u have goggles for 808 and 1064 as well as green as you will have to fiddle with it. It is not always as simple as just a quick swap.
Honestly other than a fun project I have to agree with Diachi its not worth it.
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Old 07-26-2016, 07:52 PM #4
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Default Re: IR pumping diode replacement

""Asuming the diode was not an open can""
Why it can't be done if it's an open can?
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Old 07-26-2016, 07:59 PM #5
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Default Re: IR pumping diode replacement

Quote:
Originally Posted by Laser201698 View Post
""Asuming the diode was not an open can""
Why it can't be done if it's an open can?
What he's saying is that if it was an open can you're going to have a hard time with a closed can diode. The die won't be able to get close enough to the crystal with a closed can - the can/window will get in the way. May still work if it fits but you won't get the same performance as you would with the open can.

On second thought - it may well be open can - many of these are. Good point lazerman!
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Old 07-26-2016, 08:14 PM #6
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Default Re: IR pumping diode replacement

Honestly i think that my module is weaker than 200mw (nominal power). The driving current of the diode is 250mA so i think we are dealing with a 300mw pumping diode. A 500mw would absorb 700mA as i seen on some datasheets... My laser diode seems to be an open can, so, since with a ""not open can"" diode i will lose some power i think a 500mw replacement diode would be pretty good 😃
What do you think?
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Old 07-26-2016, 08:19 PM #7
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Default Re: IR pumping diode replacement

Quote:
Originally Posted by Laser201698 View Post
Honestly i think that my module is weaker than 200mw (nominal power). The driving current of the diode is 250mA so i think we are dealing with a 300mw pumping diode. A 500mw would absorb 700mA as i seen on some datasheets... My laser diode seems to be an open can, so, since with a ""not open can"" diode i will lose some power i think a 500mw replacement diode would be pretty good 😃
What do you think?
Yeah ... not a 200mW module if it's only supplying 250mA to the diode. That's 200-300mW pump power - enough for at best 100mW green output.

That's assuming the closed can diode even fits - the can may get in the way so much that it doesn't even fit - you'd be better replacing it with an open can diode if it's open can just now. I'd go for a 300mW open can 808nm driven at 250mA... Too much power and you risk cracking or otherwise damaging the crystals.

As I said ... not really worth fixing anyway. Especially once you account for your time, cost of additional equipment (Electronics equipment and safety equipment).
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Old 07-26-2016, 09:02 PM #8
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Default Re: IR pumping diode replacement

I think expecting an output of 100 mW from a 200 mW to 300 mW pump source is very optimistic. These are usually confined to about 20% to 25%.
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Old 07-26-2016, 09:25 PM #9
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Default Re: IR pumping diode replacement

Quote:
Originally Posted by diachi View Post
What he's saying is that if it was an open can you're going to have a hard time with a closed can diode. The die won't be able to get close enough to the crystal with a closed can - the can/window will get in the way. May still work if it fits but you won't get the same performance as you would with the open can.

On second thought - it may well be open can - many of these are. Good point lazerman!

Thanks I was too slow to answer for them.

and no problem. I rebuild dead green modules for fun every now and then its not hard if you know what your doing.
The ones i prefer are the ones where the diode is closed can held in by retaining ring and optically corrected.

The trick is when you swap the diode the new output is almost never clean. You usually get a trail of multiple dots or splotches. You then have to rotate and wiggle the diode and optics around until you get a TEM00 dot.
Sometime but very rare you will get one that no matter the rotation of the diode you get perfect tem00. I have only ever seen 2 and I smoked the crystal in one getting cocky wanting more power.
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Old 07-27-2016, 10:06 AM #10
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Wink Re: IR pumping diode replacement

Do you know where can i find an open can diode? I usually buy diodes on ebay, but it looks hard to find an open can laser diode.

Anyway, the diode is placed far from the crystal and it seems like there are no lens between them. I am not sure about that, i still haven't removed the diode, but maybe we have enough room to place a closed can one.

Don't misunderstand me, i agree with you, an open can diode is better, but if it's difficult to find one, it's the only way to try to fix my module :-)
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Old 07-28-2016, 04:42 AM #11
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Default Re: IR pumping diode replacement

Quote:
Originally Posted by Laser201698 View Post
Do you know where can i find an open can diode? I usually buy diodes on ebay, but it looks hard to find an open can laser diode.

Anyway, the diode is placed far from the crystal and it seems like there are no lens between them. I am not sure about that, i still haven't removed the diode, but maybe we have enough room to place a closed can one.

Don't misunderstand me, i agree with you, an open can diode is better, but if it's difficult to find one, it's the only way to try to fix my module :-)
Diode is far from crystal with no optics Weird got any pics of it.
we cant really determine what diode you need without pics
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Old 07-28-2016, 04:49 PM #12
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Default Re: IR pumping diode replacement

I took some photos
IR pumping diode replacement-nuovo.jpg
IR pumping diode replacement-nuovo-zoom.png
I was not able to extract the diode, I tried pulling it from the back, soldering a sort of "puller" to the pins of the diode, but I ripped the pins
I tried this way because i preferred not to move the glued KTP Crystal in front of the diode....
Can you explain me how to extract the diode without damaging the Crystal?

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Old 07-28-2016, 04:53 PM #13
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Default Re: IR pumping diode replacement

Quote:
Originally Posted by Laser201698 View Post
I took some photos
Attachment 52599
Attachment 52600
I was not able to extract the diode, I tried pulling it from the back, soldering a sort of "puller" to the pins of the diode, but I ripped the pins
I tried this way because i preferred not to move the glued KTP Crystal in front of the diode....
Can you explain me how to extract the diode without damaging the Crystal?
Looks like it's press fit - you'd need to push it out from the front.
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Old 07-28-2016, 05:28 PM #14
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Default Re: IR pumping diode replacement

Do i need to remove the glued KTP crystal in front of the diode?
I guess that re-sticking the crystal in front of it with a correct alignment shouldn't be easy

Last edited by Laser201698; 07-28-2016 at 05:29 PM.
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Old 07-28-2016, 05:37 PM #15
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Default Re: IR pumping diode replacement

Quote:
Originally Posted by Laser201698 View Post
Do i need to remove the glued KTP crystal in front of the diode?
I guess that re-sticking the crystal in front of it with a correct alignment shouldn't be easy
You'd remove the whole brass crystal mount - usually just glued onto the brass diode mount.
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Old 07-28-2016, 06:15 PM #16
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Default Re: IR pumping diode replacement

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Originally Posted by diachi View Post
You'd remove the whole brass crystal mount - usually just glued onto the brass diode mount.
Yeah....but... is it difficult to re-glue in position?

Last edited by Laser201698; 07-28-2016 at 06:16 PM.
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