405nm 4-6x burner diode test

[drlava]

Hemlock_mike has sent me one of these that met a premature end. Here are some phtos of the internals. You can see the pin conection arrangement clearly, as well as a shattered facet. Also it's interesting to note the z-like gold electrode on top, instead of the usual straight sliver.

Click for larger:


Back marking on the diode (it's laser-etched):

Broken aperture window:

[Laser Ben]

Is that a crack under the diode chip in the copper?

[SideFX]

Is that a crack under the diode chip in the copper?

If you zoom in you see it looks like a string of glue.. or.. something else

[drlava]

Hmm I think that's a fiber from a piece of clothing.

[rfourt]

Here's a photo of the dot at 35 feet, after it exits my workroom, turns the corner off of a first surface mirror, and lands on a black cloth down the hall. The beam starts out about 3x4mm, with most of the power in the inner 2x2mm.
The ruler is in mm. So the collimation is pretty good.

Sorry if thi question allready been asked.

What type of Lens are you using for the diode?
aizix?

[mccarrot]

I have a strange idea.

405nm is in the very steep edge of visibility, 410nm or even 420nm is way more visible compared to 400-405nm.

When A diode operates at a higer temperature most of the time the wavelength gets bigger.

Most diodes are rated for a operating temperature between 0 and 70 degrees celcius.

Isn't it possible to use a tec in reverse and set the diode at about 60 degrees celsius to get it operating at 410nm or higher?

this datasheet http://www.o-like.com/b2b_cpinfo.asp?id=914 even shows a high limit of 415nm!!

[danielbriggs]

Wouldn't that be like sitting on a knife edge, at the edge of a cliff? Should, for whatever reason the thermal control circuit not 100% keep the temperature (such as varying modulation, causing temperature spikes) make the diode pop its clogs?

Also, wouldn't the unit have a huge warm-up time?

I see where you're coming from, but couldn't I make a 405nm diode look more like 420nm, or even 445nm by zooming it around at 12,000 mph?

Dan

[Laser Ben]

In short, yes, you can greatly change the wavelength by changing the temperature. While this will make it brighter, the efficiency goes to hell when it is outside of a certain range making the diode unstable.

[drlava]

Sorry if thi question allready been asked.

What type of Lens are you using for the diode?
aizix?

yep, that was an aixiz plastic.