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Registered Member #3215
Joined: Sun Sept 19 2010, 08:42PM
Location:
Posts: 780
3 to 4 milliamps should be OK, as soon as your discharge is pink and not orange, and the tube is not squeaking (undercurrent) or glowing like a lightsaber (overcurrent)
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061
Yeah, see Sam's Laser FAQ. Overcurrent WILL murder the tube in short order,possibly within minutes by sputtering the end mirrors onto the arc tube. Undercurrent may result in a low to non existent output as it is a threshold effect like a laser diode, the current needs to be very specific and it varies with temperature; it is a bit like a Gunn diode as far as the laser output to power input curves are similar..
Registered Member #3215
Joined: Sun Sept 19 2010, 08:42PM
Location:
Posts: 780
not any chance with a single one as they are set to output 1mA to 2mA at 800V approximately
a squeaking tube means undercurrent, voltage builds up at the inverter output and raises to the ionization point, then it collapses as plasma conducts and cant sustain current
try with a 100K 5W ballast resistor and minimum 5mA 2kV capable power supply
undercurrent and squeaking also damage tubes as the oscillating plasma ignition heats the electrodes and erodes them
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How to power up this He Ne laser?
