ggw´s 405nm

[rfourt]

Is there anyone here who also bought these diodes like me?

If so. how much output power are you able to produce with them and at what V and C?

thnx.

[drlava]

I've done some tests with my diode testing setup using diodes donated from user HighOctane of LaserSurplusParts.. the output varies depending on the quality of sled you receive. Some perform this poorly:

Some perform better:

The latter case is more typical of performance you should expect. Note the shape of the forward voltage curve is typically some indication of the die characteristics. This first diode reached 5V at only 80mA while the second one was below 4.5V at the same current.

[rfourt]

Thnx for your answer lava!

Well im not even getting those nice numbers.
although i have only tested one so far with my power meter.


= 74mW 5.35V 160mA

i will do some more testing later tonight when a friend comes over with a more stable multimeter.

What would you say is the max, and recomended Volt/mA?

[badger1666]

= 74mW 5.35V 160mA
what lens are you using ??
i bought cheap SF-AW210 and i get 140mw @ 180ma using aixiz 405nm glass lens
i think you must have crap lens or knackerd diodes if your only getting 74mw

[rfourt]

The testing has been postponed untill now. im right now waiting for my friend with a propper multimeter and amps testing equip. hes on his way here right now.

Although i just tested right now though with my own gear. wich is litle cheap and cant really tell if its accurate. Although i have been getting much higher output before with PHR diodes and the same equipm.

anyway.

just did a fast test on another of the 10X405 GGW diodes i got from the UK group buy and the result where:

64mW 5.35V 120mA

Ok as i said my multimeter is not really accurate as it is an 9Dollar chepy,
and i cant really trust my "Manson" power supply as it is digital.

but im starting to wonder whatta heck is going on.

i got 10 diodes

8 of them have been tested with 4.5V and working fine (as it seems, no power testing done except now .)
2 of them where not even lighting up untill reached 5.2V and the power where not even possible to read. (so those are rated, broken from manufacturer)

and now i have tested 2 of the other 8 with the result:
= 74mW 5.35V 160mA
= 64mW 5.35V 120mA

more testing will be done with proper tools in about 15min. so i will post the results here.

(the strange thing is that i have used the same gear: multimeter, diode driver, aixiz plastic lens with the PHR diodes and got out about 120mW at 5.2V )
the only thing that differs now is my new power supply wich is a digital Manson. wich perhaps is wrongly set. but i doubt it.

TO BE CONTINUED

[badger1666]

what laser power meter are you using to get your mw reading ???
maybe its faulty

[rfourt]

what laser power meter are you using to get your mw reading ???
maybe its faulty

Yes thats my worries also..

im using the Laserbee 1Watt powermeter. (ive heard it should be stable with 405nm)
The thing is that i have tested it before with the 405nm PHR diodes and it gives me a accurate reading of 120mW for those diodes.

But that was about 4-5months agoo so i dont know. (dont have any PHR diodes left)

Oki.. here is the test result for 4 of the GGW diodes.

Diode 1: 5.236Volt / 0.11-0.12A = 60mW
Diode 2: 5.237Volt / 0.14-0.15A = 80mW
Diode 3: 5.233Volt / 0.12-0.13A = 59mW
Diode 4: 5.239Volt / 0.14-0.15A = 82mW

Then just to see how much Volt and Amps we had to push the #4 Diode to get 100mW output, here are the result:
Diode 4: 5.456 / 0.18-0.19A = 100mW

Then i used the knife edge method toghether with some optics to combine them 4 toghether
and it gave me these results:

Diode 1-4: 5.456Volt / 0.4A = 224mW (minus about +/-10mW for the optics)


I dont really know what to say, and im not blaming Andrew couse i know hes a legit dude and i have bought perfect working stuff from him before but this is not funny especially as they are much more expensive then the "PHR" diodes.
i know quality counts also but i thought i atleast would get the same amount of output power as the PHR.

I will try and contact a real Laser Lab that is located here in the area where i live, and see if i can talk them into letting me do a propper output power test with a real Labmeter
but so far this has not been a pleasant group buy for me. 500Dollars is alot of doe!

anyway. it can be the Laserbee that for some reason has got a bee-sting-bug for laying still in about 4months. (but i dont think its likely)

Could it be that the GGw´s are giving out a strange "nm" value that the laserbee dont really handle.?

ANdrew., i have to ask..
Is there any small chance you might have mixed my order with some other. i dont think thats the case, but i really have to ask to work down what can be wrong here?.
Is there anyway to see a number or anything on the GGW sled to identify it?

Here are some pics of the setup:

[lasersbee]

If you feel that the LaserBee I is uncalibrated... check it against a known Laser of
another wavelength...
Then.. if those readings are good and the surface of the LaserBee I Thermopile is
not physically damaged... then the 405nm readings you are getting are correct...

BTW... the LaserBee I can test Lasers down to 300nm...

Jerry