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Anyone ever work with the NECSEL 10 watt 520nm before??

Shmackitup

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I sent one to George at Endurance Lasers for some testing. He posted some results.

and here: http://endurancelasers.com/exploring-more-powerful-laser-diodes-necsel-10-watt-520nm/

I haven't had much time to play around with them. I just picked up a badass power supply though so I should be able to see what it can really do.
63983
 



Arctos

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For anyone interested the 3W 535 and 2W 555s are in the multi thousand dollar mark.. they use SHG.
 

Alaskan

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Shmackitup - This thread is probably dead, but did you (or anyone in the forum) ever get one of these units to produce the full rated output output? Any pin-outs you can share?
 

Shmackitup

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Here is the pinout according to George at Endurance Lasers. I still haven't fired one up.

IMG-c2fa6db38a5a9228d4948711630a1aa8-V.jpg
 

Alaskan

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Thank you! I'm surprised more connections are not needed, I want to fire one of mine up after securing it to a TEC cold plate.
 

DashApple

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You need to regulate the diodes at 33C I believe for the best output , though the PPLN heater control is a must to get any green at all , ignoring the PPLN heater will give poor output

I have yet to run mine past 16A , Still need two temperature controllers
 

Alaskan

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DashApple, then there must be two sets of pins for the diode temperature and PPLN temperature and a built in TEC/heater for the PPLN? I didn't know it used one.
 

DashApple

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I cannot say on the module in the above picture as mine is a newer design , In mine there is a built in heater mounted to the PPLN and two 10KOhm thermistors , one for the diode and one for the PPLN , this I assume is the same / similar to the older style unit - there may be differences but there will be temperature feedback and a PPLN heater

You can measure the pins to find the what's on what , 10Kohm for the thermistors and a reasonably low valve for the heater

Heater is behind the PPLN along with its thermistor , diode thermistor is on the right just by the array

P1010538 by TwirlyWhirly555, on Flickr
 

Alaskan

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Had them in a drawer for a long time and just pulled them out again, now I see mine are different too. Appears we have the same model. I had been looking at both models for sale on ebay so confused which I had. Obviously used, with the epoxy on the bottom, seller guaranteed good repaired spares, I might have been ripped, don't know yet.

 

Alaskan

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I already posted about this in another section, but thought it would be a good idea to add the same findings here, these units are specified to run from 2.5 to 3.0 VDC to the emitter at 20-23 amps and get this: three point eight percent efficiency! Yes, 3.8%. Yikes, the 10 watt sticker means nothing, they might put out 1.7 to 2 watts max, somewhere in that area.
 

DashApple

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As mentioned in this and the ebay thread these are two rows of 24 vertically emitting diodes that are directly doubled using a PPLN crystal .

Input is around 20A , Heater voltage / current isn't given probably to due slight differences in temperature needed to get the best output .

33C on the diode and PPLN I am unsure of , In mine I have counted the 48 emitters so they are at least lasing by the look of it .
 

Alaskan

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PPLN crystals are very interesting to me, expensive to buy, these might be a source for some at a reasonable price, but not sure how efficient, do you know why the efficiency is so low for this device?
 

Encap

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PPLN crystals are very interesting to me, expensive to buy, these might be a source for some at a reasonable price, but not sure how efficient, do you know why the efficiency is so low for this device?
"1064nm → 532nm
For low gain CW the typical conversion efficiency is 2%/Wcm. For example, for 1.5W at 1064nm and a 40mm long MgO:pPLN crystal, the expected 532nm output is 180mW. At higher powers, Covesion has achieved 1.5%/Wcm with a 10W source, generating 3W at 532nm from a 20mm long crystal.
In CW systems, conversion efficiencies in excess of 50% have been demonstrated in an intracavity arrangement . For nanosecond sources (~10KHz, ~50uJ), efficiencies of 50% can typically be achieved."
From: https://www.covesion.com/support/covesion-guide-to-ppln/example-uses-of-ppln.html

Good Thor labs article on ppln : https://www.thorlabs.com/catalogpages/693.pdf
 




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