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FrozenGate by Avery

Ben joins the 445nm club

Case and flexmod p3 have arrived. All I need is my heatsink and diode!
 





Finally - heatsink from ebay and diode from Dave here on the forums have arrived. I'd probably be jumping to put it all together but I am feeling pretty yucky for some reason today, so fine electronics work is not on the cards. anyway my laser specs havent arrived yet. I really dont want to use the wicked laser ones (apparently not that great a pair of goggles for 445) so we'll wait until the new ones arrive.
 
update - this diode is going into my RGB projector and will have a happy life running at around 500mw.
 
not yet mate - waiting on saftey glasses before I start playing with the 445 - i figured not building until I am ready to test prevents a stupid moment late at night without glasses after a few beers :P

But its coming - just need the glasses, then I'll set it up for the shinp projector , take some pics, then install it in the projector.

Module in heatsink
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Module and Flexmod P3. Nice heatsink eh?
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Tomorrow I will set up the P3, fire it at a black heatsink and adjust for about 200ma, which should net ~200mw to match the lasers in my projector (100mw green, 200mw red). Once I upgrade the red to a 640 400mw and the green to 150mw, I'll crank up the blue to 400-500mw to match them. I will probably need to pinhole the blue so its beam profile doesnt ruin the projection. Although this shouldnt be too much of a problem with beamshows, which is the projectors primary role.

The projector looks great but the violet 405 just doesnt do it justice.
 
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ah huh! new goggles first, then I power it up :)

I'm betting this thing will make the colour spectrum of my projector look heaps better.

Then I'll have to combine 2 640's with a pbs, and crank up the blue again! Then throw in a bigger green to match the red and blue. Repeat ad infinitum... LOL :)

Oh, and looking at the 445 comparison thread, it looks like I'll need around 300-350 ma which will get me 200mw, to match the 200 mw of my pj's current red laser.
 
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I would increase the current setting you're planning on running your diode at. These diode's threshold is at or over 200mA, so at that current you'll likely see only a few mW of output. I'd go with 350-400mA full current, and 40mA when blanked, so that the diode runs between 40mA and 350-400mA depending on the voltage on the flexmod's mod input. When modulating laser diodes you don't want the diode to go all the way off. Over time it's been proven that diodes last longer when modulated between low and high current rather than high current and off..
 
yep 200 ma would net me around 7 mw, a perfect match for my 200mw red and 100 mw green LOL!
 
Its FINISHED!!!!!

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But now... I'm too scared to turn it on!

I've set the bias current to 100 ma, and the lasing current to 375 ma. (simply because I need a bigger heatsink, and the flexmod manual says use a bigger one if drawing more than 500ma).

Will I blow up the flexmod if there is something wrong with my diode (e.g. i exposed it to static and killed it?)

I think I should be ok, but still, I'm being cautios. The yello wire is the modulation wire, and hooked to +5v for now, so when I pluck up the courage, put on my goggles and plug it in, it will come on after the 7 second delay.
 
Well didnt take much to convince me to plug it in. I pondered over a beer, grabbed my goggles and fired er up!

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At 375 ma this thing is the brightest laser i have ever seen bar my 1 watt greenie. It appears more blue/purple, but when its mixed in with the scanner it'll provide some nice blue hues. Its a much lighter purple than a 405, which I have seen (from looking inside my PJ while it was running).

Yay! I didnt blow up the diode! (but I did loose it for half an hour while fitting the replacement 445 collimator!) :P

yes I was shaking like a leaf, hence blurry photo. I was expecting the flexmod to go bang on me coz I dropped the poor diode on the carpet, leads unshorted, and expected I'd damaged it. Yep my beamstop is a black adonised heatsink (too big to fit inside my AL460RGP projector).

So now I have gotten the artform of putting them together, I'm going to order another diode from dave, with leads but no aixiz module, and replace the diode that the ebay seller sends me to replace the blown 405 in my projector. I've tried soldering leads to a PHR diode, and killed it as they are just so tiny and my chances of doing it.... nil :)
 
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shouldnt be long guys - I am just waiting for the spare diode to arrive from dave (need to pay him first) then put that into the module that comes with the laser projector, and install the flexmod.

The flexmod is really cool - I'd definatly suggest it for projector use - tiny, adjustable, and has all the saftey features you'd want.

This particular diode is going into another scanner I am building for a friend. Hes seen it, thinks its a little too purple, and I've offered him my 150mw green to mix in. That should give a more blue colour. I should be able to adjust the colour by turning up the blue laser a bit to 400 mw.
 
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Hi,
At approximately 30C I took the flowing spectrum of the output, and the current for this test was 300ma, well above the threshold current for the diode. The wavelength of this (and all laser diodes) shifts with varying temperature and current, shifting to longer wavelengths with increasing temperature/current. That said, the 30C diode I tested was actually 442nm. All of my spectrometers are currently in Wrong County so I cannot take any further measurements to comment on the wavelength spread across different diodes or variation with temperature.

Cheers!
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http://www.dinodirect.com/
 
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