rhd
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Just a quick thread on the spectro-ing results on the new Nichia 462nm-470nm 9mm 1.4W laser diode.
First, for good measure, a spectro reading on my DPSS 473nm so that everyone can see that the spectro is properly calibrated:
473nm DPSS - test spectro reading (here)
Now for the NDB7675... I'll first comment that what I find most interesting about these results is the degree to which the wavelength moves based on current. It's more than I expected (and was depressing when I saw the spectro results on the first test @ near threshold current).
I didn't screenshot each individual reading, but I noted them as I went. At 300 mA (which was just above threshold), this diode output a dismal, average, everyday, nothing-to-write-home-about 456 nm
But then it ramps up a bit...
0.3A - 456 nm
1.0A - 459 nm
1.5A - 461 nm
1.7A - 462 nm
1.9A - 463 nm
2.0A - 464 nm
2.1A - 465 nm
And heck, it was actually 465.53, so we should probably round it up to 466 nm :bowdown:
I wasn't willing to push it past 2.1A, and had actually planned to stop at the same 1.9A DTR did. In the back of my head, since some people have theorized that this is just a binning of their other diodes, I wonder whether it might take as much current as the other diodes too, and handle 2.3 or 2.4A. If so, it looks like the rate of increase was about 1nm per 0.1A towards the upper end of my range. If that held true to 2.4A, these could potentially hit 469 nm.
If anyone wants to setup a spectro-murder fund, I'd be happy to push this diode higher - but I would only do so if DTR still has them in stock at the time, otherwise, I'm not killing this gem unless I can replace it, and the eBay seller I got this from doesn't have them listed any more.
Nichia NDB7675 at 2.1A
First, for good measure, a spectro reading on my DPSS 473nm so that everyone can see that the spectro is properly calibrated:
473nm DPSS - test spectro reading (here)
Now for the NDB7675... I'll first comment that what I find most interesting about these results is the degree to which the wavelength moves based on current. It's more than I expected (and was depressing when I saw the spectro results on the first test @ near threshold current).
I didn't screenshot each individual reading, but I noted them as I went. At 300 mA (which was just above threshold), this diode output a dismal, average, everyday, nothing-to-write-home-about 456 nm
But then it ramps up a bit...
0.3A - 456 nm
1.0A - 459 nm
1.5A - 461 nm
1.7A - 462 nm
1.9A - 463 nm
2.0A - 464 nm
2.1A - 465 nm
And heck, it was actually 465.53, so we should probably round it up to 466 nm :bowdown:
I wasn't willing to push it past 2.1A, and had actually planned to stop at the same 1.9A DTR did. In the back of my head, since some people have theorized that this is just a binning of their other diodes, I wonder whether it might take as much current as the other diodes too, and handle 2.3 or 2.4A. If so, it looks like the rate of increase was about 1nm per 0.1A towards the upper end of my range. If that held true to 2.4A, these could potentially hit 469 nm.
If anyone wants to setup a spectro-murder fund, I'd be happy to push this diode higher - but I would only do so if DTR still has them in stock at the time, otherwise, I'm not killing this gem unless I can replace it, and the eBay seller I got this from doesn't have them listed any more.
Nichia NDB7675 at 2.1A
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