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Old 12-22-2016, 10:33 AM #1
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Default Bench power supply and laser diodes..

Got two questions..
I notice many members seems to run there diode in sinkhousing from bench-power supplies, when benchmarking there diodes.

Is this as straight as it appears.. Are an rookie on this field and not least electronics lab'ish equipment, but judging from the pictures it seems that an adjustable bench-power supply is sufficient as long as you dont floor it with to much current & voltage while adjust it according to LD spec-values with an eye on when it starts to dropped & tip over..

Jumped on a couple of model-unspecified cheap 445nm-diodes a year back from an ebay auction, and these two diodes just been sitting in the draw in lack of dummyload and generel equipment.
Finally optain a couple of Korad programmable bench-power-supplies there was on sale (KD3005P and KA3003P) and trying to get familiar with the handling and been testing with some plain 1*cent LEDs in numerous colors to sense when they shift/top and role/dropped back...(not that relevant in regards to LDs and the values varies a lot but still give some insigt into the handling of current & voltage for an rookie like me to sense charistica when tilting)

the other question was in regards to these unspecified diodes i ended up with, they where simply labeled 445nm laser diodes with around "1.4A in current-suggestion" in there sealed bags,- was an ebayauction and wondering what LDs-model they actually are' to get an ida of the specification I should run them at..

back then when i recived them, I checked the web, and afterwards was of the impression it either was some 5.6mm Osram +1w model or A-140 hence the low price i got them for' and there +/- pin schematic does look a lot like A140 and a short rubber-pin spacer..

Have checked DTR very informative-site, partically the datsheets on many relevant diodes and a picture walkthrue while testing effect is appreciated from here, but i cant see any detail or test, for A140 but judging from pictures online ' they certainly look a lot like A140.. I would estimate they are A-140 (pic attached bottom)

https://sites.google.com/site/dtrlpf...0-445nm-diodes

was planning to put the voltage close to 4.8v and the current at 1500ma on the bench and see how much amp it consumes while up'ing the voltage to max 4.8v..

or will it be better to take an 12v TTL 405/445nm driver I allready got in house with adjustable drivercurrent and also adjustable drivervoltage (pic attached) and put that in between LD and bench supply' and adjusted the TTLdriver LD'out-port to 4.8v .. and with an max of 1500mah from the bench-suppl, while having the driver close to the lower current levels and then adjust the current forward from that while having an DMM attached to see what mA it takes from the driver to laserdiode..
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Bench power supply and laser diodes..-img_20160205_010028.jpg   Bench power supply and laser diodes..-img_20160205_010735.jpg   Bench power supply and laser diodes..-htb19e6mkvxxxxbzxvxxq6xxfxxx6-1-.jpg  



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Old 12-22-2016, 07:40 PM #2
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Default Re: Bench power supply and laser diodes..

Those are likely A140s. All credit goes to DTR for this photo but here is an easy way to tell.


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Old 12-22-2016, 08:54 PM #3
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Default Re: Bench power supply and laser diodes..

Correct way to test a laser diode with a benchtop power supply.

1.)with the power supply turned off short out the output of the power supply briefly to ensure no stored charge.
2.)connect the laser diode to be tested (pay attention to correct polarity)
3.)set the current on the supply to zero
4.)set the voltage of the supply to ~2*Vf of the diode
5.)turn on the power supply and slowly turn the current up
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Old 12-23-2016, 02:05 AM #4
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Default Re: Bench power supply and laser diodes..

If it's a good power supply that sould be okay.

To be on the safe side i'd go about it a bit differently though: Turn the power supply on, set both current and voltage limit at zero. Ensure there is zero voltage on the output using a multimeter, then connect the laser diode.

First turn up the current limit to something easily accepted by your laser diode, perhaps 50 mA or so. Next turn up the voltage, up to the point where the supply switches from constant-voltage to constant-current operation (there usually is an idicator for this).

After that you can play around with the current limit. If you ever hit the voltage limit (indicator changes back), lower the current limit, increase the voltage limit and proceed.

This seems a bit elaborate, but for some cheaper power supplies it is the best approach as some have a brief output spike when you flip the mains switch, regardless of what the buttons are set at.

The reasons for it can be a bit complex, but just think of it like the main power source ramping up faster than the voltage to the control circuitry. If you have a scope you can see if your power supplies does this or not. Otherwise, err on the side of caution
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Old 12-23-2016, 05:37 AM #5
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Default Re: Bench power supply and laser diodes..

Be sure to disconnect the power supply from the diode before flicking the off switch. Lower the current to 0, unplug, then turn off. Or you will end up with spikes from some power supplies.
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Old 12-24-2016, 06:23 AM #6
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Default Re: Bench power supply and laser diodes..

thx guys for the feedback.
Quote:
Originally Posted by WizardG View Post
.. the power supply turned off short out the output of the power supply briefly to ensure no stored charge.
yep WzardG I have notice that shorting out the plugs to clean out the hardware / caps. (but still it certainly ring an warning-bell to put that red&black wire together from an rookie-perspective,- have notice the approach to clean out stored charge, and also for generel-review and test some supplys,, but then its "on" with heavy load, and not in regards to cerolized but effecthandling..
Quote:
Originally Posted by Neobenedict View Post
Be sure to disconnect the power supply from the diode before flicking the off switch. Lower the current to 0, unplug, then turn off. Or you will end up with spikes from some power supplies.
..Im unsure where it is on possible spike-issues (its new supply, a first for me with an actual adj bench-supply) and not familiar how these liniar Korad are on overcurrent & spikeshandling, - dont got oscilloscope, but judging from the web, the spikes and overshoots should be pretty decent for these liniar PSU from Korad, and not to shabby with the relative-low-price in mind ewen thow relative noise, but it seems to vary on different productionsruns, but will certainly do my best to remember it..(still dont wanne see how my face looked when blowing an expensiv diode from an socalled error 40 in lack of skills.

Quote:
Originally Posted by Euphonious Nonsense View Post
Those are likely A140s...]
Euphonious, no doubt its the A140 model I reckon, judgíng from the spacers, unless some sellers packed these up, to put on' as safety under shipping, like the case with some general-pinjumpers used as LDpinrack under shipping, but pretty confident to follow the datasheet of the A140 ..//
http://roithner-laser.at/datasheets/...445-1000mg.pdf
http://cms.diodenring.de/electronic/...e-laser-diodes

Quote:
Originally Posted by Benm View Post
Next turn up the voltage, up to the point where the supply switches from constant-voltage to constant-current operation (there usually is an idicator for this).

After that you can play around with the current limit. If you ever hit the voltage limit (indicator changes back), lower the current limit, increase the voltage limit and proceed.
Benm, . that its exactly where im at, and have notice this behavior when testing other electronic equpment/loads, and trying to comprihent the meaning of this constant curring-effect that kicks in at some point according to the load on & effect when the voltage kicks in again on actual-values' when it gets to much for the item... (will take a look in the manual so i can get more familiar with the constant-current (CC) variable-features hence when on constant-voltage (CV) levels.)

Anyway its these two cheap peogrammable PSUs (pic attached, weight varies hence transformer max3A vs 5A and so does AC cables thickness) but both of these where quite ttractive prised hence my taxed-personalview here from Denmark' one of them where from Germany (Reichelt) KD3005P 76EU and the other from China KA3005P (66US) both computer-USB & RS232'able and the choice for seperate graphs and valuehandling in each channel-window with sererate channel-load on/off-buttons on computerscreen.. that was something I priotise. (but if I was based in the US, I would likely haved looked at the KA3305 3'channel, at +139US delivered from SRA solder, but that partically-price would more then double when shipped to DK north EU.hence tax & shipping)
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Bench power supply and laser diodes..-img_20161223_173454.jpg   Bench power supply and laser diodes..-img_20161223_173322.jpg   Bench power supply and laser diodes..-img_20161223_173657.jpg   Bench power supply and laser diodes..-img_20161223_173903.jpg  

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Old 12-25-2016, 02:34 AM #7
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Default Re: Bench power supply and laser diodes..

These are not the best supplies to drive laser diodes from directly indeed.

Many of these power supplies have current limiting, but it usually is slow. This current limiting is often mostly intended to keep you from damaging the power supply itself, but not to protect the load against excessive output currents at all.

Also you should notice that these power supplies are built to power to power things that don't need current limitation unless you made a soldering mistake or something like that.

Such power supplies are perfectly fine for powering hobby electronic circuits, but are not suitable to power laser diodes directly. They will work fine when simulating a battery on the input of a laser diode driver though.
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Old 12-25-2016, 02:45 AM #8
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Default Re: Bench power supply and laser diodes..

Along with what others have said remember that if you are powering a laser diode and you knock a wire loose, DO NOT reconnect it without turning the voltage and current back down to zero first or you can easily spike and blow your diode.

Also as I use a bench top supply to drive a laser diode I turn up the voltage limit a little bit then the current and back and forth so that both are being limited while in operation, this way if you have an intermittent connection you are less likely to blow your laser diode.
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Old 12-25-2016, 03:00 AM #9
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Default Re: Bench power supply and laser diodes..

I have the KD3005P and I can tell you for sure it has issues with voltage spiking when mains is switched on/off so careful there! I dont use it much anymore and this is why.

Last edited by Euphonious Nonsense; 12-25-2016 at 03:02 AM.
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