If it is of any help, I have measured voltage across the upper socket witha digital meter and I can read 2.538v when it is powered up. I have also checked the singel wire from the lower socket and it appears to be common with the +ve pin on the upper socket.
When reading the laser output pins I am reading 5.62v when it is in laser mode or in focus mode. I was expecting a lower voltage in the foucs mode but now i suspect that there is already some form of modulation happening. I don't have a scope so I am not able to check wave forms etc. (not that i would know what i was looking at!).