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Cheep 1W 445nm laser diodes!

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Adam Munich

Wed Jun 16 2010, 12:27AM

Registered Member #2893 Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242

Killa-X wrote ...

Well, TEM00 is best for long distance pointing / beam. Else the distance you can see the beam at night is going to be short. Personal preferences. Where you get the 250mW green? O-Like? Rayfoss? My 200mW came from rayfoss :D

I'm surprised you bought from rayfoss. They're lasers put out nearly half their power as IR. My laser starts at 350mw, then settles to 270mw over 3 minutes (green, not ir). It puts out alot of ir too. though.

I paid $570 8 months ago, and considering it survived multiple 10ft drops onto asphalt, i think i got my money's worth. ;)

Killa-X

Wed Jun 16 2010, 12:34AM

Registered Member #1643 Joined: Mon Aug 18 2008, 06:10PM
Location:
Posts: 1039

Actually I tested mine to be 208mW :P Many others have found them to be at spec...I havnt had issues with them :) She even offered me a 600mw module for $300 to pretune my self, and they sell the full thing for $625. The module is everything but a battery and metal host. It has the lens, the driver, the 2W IR-pump, Good deal :D

Adam Munich

Wed Jun 16 2010, 12:35AM

Registered Member #2893 Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242

wow. i've had bad luck with rayfoss in the past. i'll have to take them off my avoid list.

Conundrum

Wed Jun 16 2010, 07:25PM

Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4059

just be careful guys, these things go from 5-10 mW to >250mW with as little as a 0.5mA power increase.
Its also possible that at sub threshold power levels they can be unstable and "burst" into dangerous laser output with no warning at all.

seems to be a known issue with blue diodes, as well as some newer high power reds.
Be careful! you don't get another set of eyeballs...

-A
#include "yes_LEDs_can_burn_retinas_too.h"

IntraWinding

Wed Jun 16 2010, 07:54PM

Registered Member #2261 Joined: Mon Aug 03 2009, 01:19AM
Location: London, UK
Posts: 581

Conundrum wrote ...

just be careful guys, these things go from 5-10 mW to >250mW with as little as a 0.5mA power increase.
Its also possible that at sub threshold power levels they can be unstable and "burst" into dangerous laser output with no warning at all.

Thanks - that's a useful warning

Killa-X

Wed Jun 16 2010, 09:41PM

Registered Member #1643 Joined: Mon Aug 18 2008, 06:10PM
Location:
Posts: 1039

Its true. the threshold as stated is 200-300mA. Any lower and the laser is like 5-10mw. and as I slowly crank the diode, it hits the special number of my diode, and BAM! bright light. Then as I go up the brightness dramatically increases. Theres a ton of talk about these lasers. WL lends them to chance of cancer..Which isnt true.

These lasers are 345nm, and cancer can be given of UVB and UVC rays...UVA is top at 300nm...The raeson they link it to cancer probably is Blue light hazard. Dropping melatonin. But its still...Not really a risk.

These lasers do cut electrical tape like butter (VERY fast) at 500mA. I hit my figure during the cut as a test, yeah, pain :P

Also...I seen someone at photonlexicon claiming they are running a RGB projector, using these diodes at "1300mA" geehs.

Scroll down to the picture of the blue room, they mention these sleep disorders caused by blue LEDS, and possible cancer due to melatonin over long periods of times

Adam Munich

Wed Jun 16 2010, 11:40PM

Registered Member #2893 Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242

445nm killa.

...

Thu Jun 17 2010, 02:30AM

Registered Member #56 Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445

They are run at 1.44A in the projector at a 30% duty cycle, I have on doing a burnin test at said 1.44A and so far after a day of burning I haven't been able to detect a drop in power (so it is within 0.5% of what it was this morning). Power output is about 2w depending on if you consider losses from the focusing lenses.

Killa-X

Thu Jun 17 2010, 03:25AM

Registered Member #1643 Joined: Mon Aug 18 2008, 06:10PM
Location:
Posts: 1039

Grenadier wrote ...

445nm killa.

Typo :P

But 1.44mA at 100% duty? Must be using a TEC to run it at a stable temp. Surprise, if you are doing CW how much these can handle. It still makes you ask, Whats the max you can do on these? They really not cheap enough to just blow them off like the $7 20X red DVD burning sleds...

...

Thu Jun 17 2010, 06:31AM

Registered Member #56 Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445

I am using a tec to keep the measurements consistent, but in the projector the diodes are cooled with a simple fan and run in the 40-60C range (I never tried letting it heat to the point where it shut down, but in normal operation the diodes are run quite toasty!)

I am trying to avoid running one to destruction, but my driver goes to 3A so expect some measurements taken up to that point before too long. I think my current plan is to do 24hr runs at 200mA increments (starting with a 1.4a run tomorrow) until the diode starts to show signs of distress.

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