Murder fund - WH16NS40 16x - Blu-Ray BDR / BDXL burner

I'm calibrated for about a 250 nm range, 420 to 670. I can buy a different grating, but frankly, they're very expensive, and I haven't really been interested in more than the range above. Plus, as mentioned, greater range means lower resolution.

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Ahh I see. Probably not worth it then.

Or ask lazeerer or Cyparagon to borrow you one of their tested 405nms. Afaik the low-powered ones, producing less heat, doesn´t shift in wavelength a lot
http://laserpointerforums.com/f44/s...ome-common-diode-lasers-57959.html#post819708

DJNY said:

Or ask lazeerer or Cyparagon to borrow you one of their tested 405nms. Afaik the low-powered ones, producing less heat, doesn´t shift in wavelength a lot
http://laserpointerforums.com/f44/s...ome-common-diode-lasers-57959.html#post819708

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You can't really calibrate a spectro from a diode source. It's kind of like recording a VHS from another VHS, you end up introducing too much error back into the system. You need to calibrate from a guaranteed stable line.

I think the fluorescent line solves that problem anyway. It's now just a matter of whether I want to recalibrate.

Night club "black lights" are also Hg-vapor and have a very bright 404nm line due to the wood's glass filtering the higher lines out. OTOH I don't think these diodes will shift much because it's always better to have tighter specs for optical drives...

These diodes red shift plenty, especially with how hard we drive them. Blue shift? Not so much.

Disappointed that I just found this, but immensely looking forward to the results. 405nm is my second favorite common diode wavelength.

Isn't blue shift and red shift the same thing when talking about a 405nm diode?

DJNY said:

Good catch!

Click to expand...

You know what I meant!

ARG said:

Isn't blue shift and red shift the same thing when talking about a 405nm diode?

Click to expand...

Gotta love that EM physics humor:wave:

bloompyle said:

You know what I meant!

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oke:
:na:

Can we do some kind of longevity test to see how prone it is to degrading before killing it? It won't do us much good to have max power without having "safe" current values.

Hehe, I love physics humor! Good one guys!

TheDukeAnumber1 said:

Can we do some kind of longevity test to see how prone it is to degrading before killing it? It won't do us much good to have max power without having "safe" current values.

Click to expand...

Nope. Even if we could think of a way to go longevity testing without the "long" part of it, and I don't think there is one, longevity testing and max current testing would be mutually exclusive tests. One would impact the other, so both cannot be conducted on the same diode.

The first step, this step, is seeing whether the diode exhibits a max current / power that makes it worth using over the 405s we use now.

On the way up to max power though if we record the mW/mA on a graph we should see where efficiency drops off. As it will be the same chemistry inside the diode, we can probably infer a general idea of what current to not exceed. I believe we will always see some degradation simply due to them all being chemically similar.

I suppose we're foregoing, the possibility of the diode power being similar to current options but possibly being more stable. Personally I value diode durability highly and would rather know that but I understand if it's not the popular opinion. Getting a freak or crappy diode could give us false information on the average max power.

You can't test longevity without testing the diode's limits.

As stated earlier, the 405 and 650 diodes don't handle a beating well. Once they LED, they're gone for good. This test will likely end either when that happens, or when the power increase starts to plateau.

We will never know longevity of a diode until it's been used for a while, or you get a beefy heatsink and cooling method to run the laser constantly for a long period. Either would work, but the first step is to test the limits of the diode. Without that information, we can't go anywhere.

Welcome to new diode testing Baby steps. If it proves to be a decent diode, more will be bought. Then perhaps we could do a 16X graph like we did with 8X and 12X diodes. Where the builder adds all the stats of that build, and when it dies, they report it. That will tell us longevity.

One step at a time

EDIT: Even after all that, some diodes just do whatever the hell they want *cough* GGW 6X *cough*. Those were known to work wonders at higher currents, or insta-death at currents below what was considered "safe". Some diodes just are not made to handle above what they are rated for, at least not consistently. I knew of people going through 2 or 3 GGW's to get a build at the current/power they wanted. To put it bluntly, shit happens.