kecked
Active member
- Joined
- Jun 18, 2012
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- 43
So what happened with the two lines. Did you ever measure them. Ahhh Necro posting.
paul you said that you don't heat sink the diodes and only drive them just above threshold when observing the wavelength via spectrometer, you should use a non press fit sink and drive them at spec and normal operating temp, then you would see what the wavelength is as per the diodes design which would be a more accurate assessment because nobody is going to use them at barley lit threshold.Wow! I have binned many of these diodes, but have never seen one measure 485.anything nm. That is remarkable in my view. These diodes tend to shift more with temperature than drive current from my tests with them. Are you certain of the spectrometer's calibration?
I actually have a diode very close to the 485.0nm mark (as also measured by kecked at SELEM) but I don't know the drive current so I didn't report it here. Dr.Laser has a freak diode that came in at 480nm! I'll check the calibration on my spectrometer sometime soon to be sure about those measurements though.Wow! I have binned many of these diodes, but have never seen one measure 485.anything nm. That is remarkable in my view. These diodes tend to shift more with temperature than drive current from my tests with them. Are you certain of the spectrometer's calibration?
Yeah, I'm aware of that 480nm diode. It was from a small batch of diodes from Sharp that came to us first. Most measured between 473nm and 478.8nm, but one or two squeaked through to 480nm. That was the only diode that I didn't save any spares from. I'm still kicking myself for that. See my 477nm one in my signature.I actually have a diode very close to the 485.0nm mark (as also measured by kecked at SELEM) but I don't know the drive current so I didn't report it here. Dr.Laser has a freak diode that came in at 480nm! I'll check the calibration on my spectrometer sometime soon to be sure about those measurements though.
For the record, I did take my measurements with the diode in a heatsink, I just didn't use any temperature control to lock the diode to a set temperature.
That's great! I had no idea some of the newer ones got that low. I might have to see if I can get my hands on one. Thanks.I promise that diode is as advertised. Not only was my spec calibrated, it was obvious by eye.