Laser Diodes

[LaserMod]

Does anyone know which diode they use for the Leadlights:

SLD301V or SLD302V

Spec sheets can be downloaded from:

http://www.photonic-products.com/products/laserdiodes_invisible/sony_invisible.htm

I'm guessing it is the 302 with 500ma max current and 200mw output but I might be wrong...(just as 15% best efficiency of 200mw IR is 30mw green).


Here's something to think about - notice on the spec page the SLD333V 1000mw diode comes in exactly the same package and pin type. Imagine putting one of them in a leadlight - hey you would have to scrap the AAA batteries and seriously mod the circuit to give 1500ma (and the MCA will die instantly I think)...15% best efficiency of this diode would give a true 150mw green. /ubbthreads/images/graemlins/ooo.gif

 

[liteglow]

150mW green from a 1000mW laser diode ??

Can u then explaint to me how it`s possible that people telling they got 50-60 and even 100mW green output from a normal Leadlight laser pointer !?!?! /ubbthreads/images/graemlins/blush.gif

 

[lasercrazy]

The current draw of that diode is crazy! /ubbthreads/images/graemlins/faint.gif The diode CNI is using can produce 150+mw at 800ma, then that diode must be very inefficient.

 

[LaserMod]

I know I've seen them also - I can only assume that the LED test is not reliable at higher output power. Has anyone actually confirmed this power with a professional meter?

I got 70mw flashes from a leadlight 110 but it was extremely unstable and the power only lasted a second and then dimmed.

Its simply not possible to get 100mw+ stable with the factory diode, however I do believe that 50, 60, 70mw is possible but as you can see these are very rare cases and some would involve changing the diode to cope with the extra power...which is my current project now...with some success /ubbthreads/images/graemlins/smile.gif

 

[LaserMod]

[ QUOTE ]
lasercrazy said:
The current draw of that diode is crazy! /ubbthreads/images/graemlins/faint.gif The diode CNI is using can produce 150+mw at 800ma, then that diode must be very inefficient.

[/ QUOTE ]

Hmmm, good point but surely 1000mw of IR can be converted into more green with a better MCA.

It must just be 15% with the current leadlight...I've also heard however that upto a third green is possible depending on the quality of the MCA conversion process.

 

[Enigmahack]

Actually, it's neither of those. If you did a little more research, you'd see that the leadlights use a 5.6 mm diode, however all of the diodes listed there are 9.mm and above... So none of them are right dude.

 

[LaserMod]

I'm not convinced I'm sure it's one of these - I read somewhere that the 9mm package is the same as the 5.6mm with a converter...I'll look into it... /ubbthreads/images/graemlins/confused.gif

*sometime later*

Aha! I've just taken my leadlight apart and the actual diode looks about 5mm but the piece of brass it is fused to is definately 9mm... /ubbthreads/images/graemlins/confused.gif /ubbthreads/images/graemlins/thinking.gif Maybe we are getting mixed up with diode and package sizes.

 

[LaserMod]

Hang on, just received email from Leadlight...

It is the SLD302 diode that they use...funny they missed off the 'v.'

Great I now know I can safely up my current to 500ma as per Sony's spec sheet. Thanks for the help anyway CPF. /ubbthreads/images/graemlins/smile.gif

Now where's my soldering iron... /ubbthreads/images/graemlins/au.gif

 

[liteglow]

500mA ?
i think that was alot.. my laser did take 540mA when i did shorten the pot to housing /ubbthreads/images/graemlins/blush.gif)
but maybe there only is something bad with MY laser :\

 

[liteglow]

where can i buy a 9mm 500mW diode to my laser !?

i want one today !

 

[LaserMod]

The 500ma diode is what comes standard with the Leadlights that one is 200mw.

If you want a 500mw diode - check out www.ifixlasers.com there quite expensive but I would imagine it's worth it.

 

[liteglow]

9mm 500mw 808nm Gas trap..........$175

so that is ONLY the diode ? crap.. i did beliwe that was a complete laser !?

 

[cbfull]

A complete 500mW laser for only $175? Keep dreaming.

To use the 9mm package in the leadlights you will probably need a lathe. Check out the pix on this guys great website:
http://www.phalkin.com/sbk/MainIndex.htm
Follow the 2.12.2004 link and you will see what I mean.

Seems like a big risk damaging your module if you are not experienced with it.

Just a little info, I contacted HPD (High Power Devices) about a diode just like that one, but with a built-in beam correction optic. This allows you to use ALL of the emitted IR to pump the MCA rather than just the middle of the rather wide and flat profile from the raw diode, which is a problem with all of the green pointers. Price was around 550 bucks.

I don't know how much more IR you could get to the MCA this way, but I might be able to take some measurements and get a pretty good approximation. I'll post my results if I get anything interesting.