Retuning a DPSS laser module

Hello everyone,

My laser module is unproperly tuned (DPSS) and it's outputting 50mw instead of 200mw.
So I have a question about how to obtain info about tuning a laser module (with TEC cooling).
There are 2 pot meters I heard, one controls tec cooling and the other one align's the crystal? (not sure about that last thing)
I'm already asking mccarrot about the spec sheet what the pot meters are.
But what tools do i need to use while tuning.
What measures should I keep an eye out?

Sorry for asking I might not have done enough research, but a slight push in the right direction is always nice :)
I will take the time to read off course.

Thanks guys!

Best regards,

Pieter

You will need to let me see a pic of the inside of the driver board....or if it is a well known laser brand. If it only has two trimmer pots...I would expect one to be current to the diode and the other TEC temperature to cool the diode.
Let me know.....ME3
A pair of temperature probes will be needed to perform the tuning with a lot of time available to tune properly....max performance is not the goal as this will usually destroy the modulation abilities without jelly beaning.....in scanned lines. Pump power input levels vary so much at that point the SHG will not quickly accept the mode volume changes that rapidly......or install a larger crystal set.
On another note check to make sure that you have near 5 v on the modulation inputs before you go tuning....check with a scope....miltimeter will not read DAC outputs at his level needed to be seen with a lot of DAC's.

Ok will do!
Pics coming up :)!

If you need better pictures.
Please let me know
The middle module is a blue module.
The driver board appears to be all in the upper right.
Green is on the left and a dual red is located left from the blue module.
Attachment 26117Attachment 26118Attachment 26119Attachment 26120

The driver in pic 1 and 3 is a CNI type driver....this is the one for the 532nm?????

yes it is
(15 chars)

OK let me try and get you the trimmer allocations and functions...one minute please............

Helpful diagrams and warnings of IR eye hazards sent.......Be Careful....God provides only one pair of eyes.
Please do not share this information.....and taking the laser head apart to make direct contact with the diode and crystal set will be needed to correctly set this, being careful with ESD precautions in mind all the time here. You could make small adjustments as I sent info on without taking the laser apart. You will need a laser power meter as well. I would contact Stanwax {Rob} if this does not gain results......he is closer to you. If not you could just replace the laser and have a spare when repaired.

i had a cni do that to me once found out it was that dumb power connector they use, as when poking around with it the power when back up.
i also noticed the socket got warm even though there was a good connection, turned out there was somthing in the black plastic mix that allowed it to partially conduct ??
any way i removed said socket, and hard wired driver to power supply never had a problem again

Didn't i told you yesterday I have a decription how to tune and which pot to turn?

http://www.photonlexicon.com/forums/...ght=Cni+tuning

Quote:

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Originally Posted by mccarrot

Didn't i told you yesterday I have a decription how to tune and which pot to turn?

http://www.photonlexicon.com/forums/...ght=Cni+tuning

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Hehe sorry I'm pretty tired.
I will have a look right now though! :)

I do not have the right measurement equipment to measure temperature :(
So I'm unable to do this, also I have no clue where to get this.
How much *preferably in the netherlands* would it cost to get this blue DPSS module retuned?

You do not need to measure temperature, you need a power meter. But we can give it a try on the next lem

DPSS was measured wrong and had a warmup time of 15 minutes. I also cleaned my optics and power should have likely increased *measurement wasn't made from the laser output directly.

Quote:

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Originally Posted by mccarrot

You do not need to measure temperature, you need a power meter. But we can give it a try on the next lem

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Oh...OK I guess I have been building DPSS lasers wrong all these years. I have several temperature data sheets on actual LBO and BiBo crystal temp ranges for SHG of type 1 and type 2 from several manu's. The quality of A/R coatings also have an important factor in a bulk laser's power production. And I guess I wasted my time temperature tuning diodes for max PO at a given amperage......have fun and good luck. BTW I thought the 532nm laser was in question ? Now I see a post of the blue with an issue as well? Strange days indeed.

oh no it was the blue that was outputting lower power.
So i thought.
I've been told today the measurement was likely unreliable. Not only did I clean my optics extra today *they were really filthy after all* and also it wasn't measured directly from the laser module but after the apperture with no 15 minute heatup.