FlexMod Driver

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10-18-2008, 08:41
DZ

FlexMod Driver

I picked up one of the FlexMod drivers from drlava a few weeks ago and finally put it through what I thought would be its best test, Raster. The video I uploaded is only in 1 color, for now, as you can see, it does a very good job. I apologize for my camera going in and out of focus. Nice work drlava! I think I'll be back for more soon.

http://video.google.com/videoplay?do...81874943&hl=en

The drivers can be purchased here: http://hacylon.case.edu/ebay/laser_diode/FlexMod01.php
10-18-2008, 09:50
Stuka

Hey, DZ -

What diode did you use, and what power supply voltage, current setting adjustments, etc. did you use for the driver?

Thanks!

Randy
10-18-2008, 10:01
DZ

Quote:

Originally Posted by Stuka

Hey, DZ -

What diode did you use, and what power supply voltage, current setting adjustments, etc. did you use for the driver?

Thanks!

Randy

Hey Randy, it is a DT-0811 diode, I haven't tried the PHR-803t diode which seems to be a little more abundant. I'm using a 6VDC wallwart, diode is biased at about 25mA and the top end is only set for about 70mA.

The DT-0811 diode lases at a higher wavelength than the PHR-803t diode, in my very crude measurements, the DT-0811 diodes comes in at 412.5nm and the PHR-803t diodes comes in at 404nm. The 412.5nm estimate seems to be more of an exception than the rule though. I had a guy from LPF send me 4 other DT-0811 diodes and they came in at 404, 407, 408.5 and 407 again.
10-18-2008, 10:40
Stuka

Cool -

What's your estimate of beam power with your configuration, and have you tried mixing that with your blue laser?
10-18-2008, 10:47
DZ

If I had to guess, its probably only doing about 40mW. The guy I bought it from had it running at 100mA and it was doing about 70mW. Even at only 70mW it looked brighter than a PHR-803t doing nearly 150mW! Anyway, I haven't mixed it with dpss blue and probably wont be, I just have this setup on a small plate for testing scanners.
10-18-2008, 13:57
thesk8nmidget

Quote:

Originally Posted by DZ

If I had to guess, its probably only doing about 40mW. The guy I bought it from had it running at 100mA and it was doing about 70mW. Even at only 70mW it looked brighter than a PHR-803t doing nearly 150mW! Anyway, I haven't mixed it with dpss blue and probably wont be, I just have this setup on a small plate for testing scanners.

you absolutely scored with the 412nm!

i dont think either of the two sleds can really be guaranteed a higher or lower wavelength since there are some people that have has 410+ 803t diodes and some even lower than the visable spectrum.

same goes for the 0811 some are high some are low.
the bad part about these diodes are they vary so much, so you never know exactly what you are getting and what its capable of until you put it through some tests.
10-18-2008, 16:35
drlava

Hi, thanks for the post. I knew the driver was good through simulations and oscilloscope/laser tests, but it's cool to see the tests others are able to come up with using their advanced scanner hardware and control software. 412.5nm! that is excellent. I have seen the difference 408 makes verses 405nm, would you estimate 2 or 3x increase in apparent beam brightness of the 412.5nm over 405nm at the same power?
10-19-2008, 06:24
DZ

Quote:

Originally Posted by drlava

I have seen the difference 408 makes verses 405nm, would you estimate 2 or 3x increase in apparent beam brightness of the 412.5nm over 405nm at the same power?

Hmm, I don't really recall exactly how much brighter it was over the PHR-803t diode, I just remember it being brighter. I bought the two from a guy on LPF, sadly the PHR-803t didn't last long, as I was trying to determine its wavelenght, it failed. I replaced the diode and backed the current down to something a little more reasonable so I wouldn't have to worry about a duty cycle. The guy was nice enough to offer a free repair, however I declined and repaired it myself since I figured it would be a nice learning experience.
10-19-2008, 16:01
chad

What scanners were those?

chad
10-19-2008, 16:32
thesk8nmidget

dt40 pros i believe since thats what he sells :)
10-19-2008, 17:26
allthatwhichis

Gotta turn that auto focus off man! ;) I think may put that 405 I got and lava's first drive in the box with the scanners I bring you. :cool: See if you can get it to work. :o
12-26-2008, 12:03
allthatwhichis

Quote:

Originally Posted by drlava

Hi, thanks for the post. I knew the driver was good through simulations and oscilloscope/laser tests, but it's cool to see the tests others are able to come up with using their advanced scanner hardware and control software.

Hey drlava, might you have any spares of of this driver lying around? :D
12-26-2008, 14:54
keeperx

i would eventualy like the v2 so i can replace the ones im using now..
12-26-2008, 18:41
mophead

Mee Too.

I could use 4-6 of the drivers when they are avilable again.
12-26-2008, 18:52
drlava

They are coming soon.. only a couple weeks now.
12-26-2008, 18:56
mixedgas

think i need 3

steve.
12-26-2008, 23:45
Laser Ben

Quote:

Originally Posted by DZ

Hmm, I don't really recall exactly how much brighter it was over the PHR-803t diode, I just remember it being brighter. I bought the two from a guy on LPF, sadly the PHR-803t didn't last long, as I was trying to determine its wavelenght, it failed. I replaced the diode and backed the current down to something a little more reasonable so I wouldn't have to worry about a duty cycle. The guy was nice enough to offer a free repair, however I declined and repaired it myself since I figured it would be a nice learning experience.

405.0066555nm will have a response of 0.000640563 relative to 1 at 555nm
412.5153933nm will have a response of 0.001628479 relative to 1 at 555nm

Those are the closest data points I have. It is significantly brighter. 0.43558 lm/w for 405nm vs. 1.101365 lm/W for 412.5nm

How are you testing the wavelength? Do you have a spectrometer?