> But article mentions 13.8 Volts. I wonder why there is such a huge gap? I'm spitballing here, but I'd guess that the difference is due to a resistive drop ac

> But article mentions 13.8 Volts. I wonder why there is such a huge gap? I'm spitballing here, but I'd guess that the difference is due to a resistive drop across one or both of the contact layers. In the article, Fig 2 says that they have 0.5A flowing with a pulse width of 50 ns and a pulse rate of 2 kHz. Their duty cycle is then 1/10000, so that's a lot of current flowing during the active part of the cycle. I haven't found all the details about the dimensions and doping, but any small amount of resistance might cause enough potential drop between the contact and the lasing region to account for the difference (especially that side contact to the bottom n-type layer.)