gas laser enquiry

[shrad]

hi guys

for some projects I have in mind, I want you, if possible, to give me details about your tubes:

brand and model
discharge voltage
discharge current
triggering voltage
triggering current
filament voltage
filament current
optical output power
type of gas

this is only to make some statistics over the voltage and current ranges found on these tubes, according to optical output power and type of gas

more info when the project will be put on the table, in several months

if some of the details are unknown, don't worry, the rest will still be worthy

you might also put the AC input characteristics and watts used by the PSU, which could also be useful

cheers!

[Steve Milani]

This is specs list of my He-Ne @632.8nm "Spectral RMML505L"
http://www.photonlexicon.com/forums/...ead.php?t=6349

Greets
Steve

[mixedgas]

nearly everything ion is a either 3.2 or 2.6V AC cathode. Ranging from 25 to 50 amps, and this must be adjustable to match the power line. The tube current must be balanced off a center tap of the cathode transformer, or the arc favors one side and melts it. This transformer is designed to maintain a constant wattage. They are not cheap, in fact they are the most expensive part in most supplies.

I have tubes from 85 V @ 9 amps to 265V at 35 or more.

Steve

[Doc]

Steve,

are the transformers regulated by magnetic shunting or is there some active control involved?

Cheers, Ian

[buffo]

I want you, if possible, to give me details about your tubes:

Allow me to introduce you to Sam's Laser FAQ. Specifically, to the ion laser section. Lots of good information in there.

Adam

[shrad]

silly me, I didn't even think about sam, although I have been looking there each time I had something to learn



anyway, if you have some hints about high power current AND voltage regulation, you may send me a PM

[mixedgas]

[QUOTE=Doc;116187]Steve,

are the transformers regulated by magnetic shunting or is there some active control involved?

Old ones have the shunting, newer coherent ones are ferroresonant, lexel has 3 user adjustable taps, coherent medical has taps, JDSU uses a line side power control on some lasers. And a few really new coherents have phase control of some form.

A few rare units SP, Laserphysics, have HF or DC cathode drives for low noise in semiconductor processing, but they have to flip polarity or something to even the wear.

steve

[Steve Milani]

Steve,

are the transformers regulated by magnetic shunting or is there some active control involved?

Cheers, Ian

I'm really sorry Ian...
I ignore it... also because I am not so expert in electronics...

The only thing I can tell you is: the first PSU I had (has gone burned because my guilt...) was a enough heavy and big box which inside was a medium size "classic" transformer and an electronic card (resistors, capacitors, triacs, etc. etc.).
At the present the PSU unit is much more light and smaller (5x5x15cm; about 600-700 grams of weight). I can remember when I bought it from the factory, they told me: "this new PSU is much better than the old one because it is a *switching* type".
It is sealed, so I can't open it to investigate what components inside are...

Greets!
Steve

[GooeyGus]

brand and model: Spectra Physics 168
discharge voltage: ~240VDC

discharge current: 10-38A

triggering voltage: Not sure on this one... I know the there is a voltage doubler to put around 500V to the tube at startup, but I assume there is an actual pulse that goes through which is a bit higher, but again not sure on this (Pat? Steve?)

triggering current: I think around 8-10A is idle, not sure if there is a certain amperage the power supply goes to to start the tube though.

filament voltage: About 3V

filament current: My guess is 30A, but I haven't measured an exact value (Pat? Steve?)

optical output power: It was doing just under 8W @ 34A (tube max is 38A)

type of gas: Argon

[shrad]

thanks guys, your input is appreciated... I have now some work to do on a big gas laser, if it is intact...

original PSU was 3 phase 400V @ 60 amperes to get it to full power, and I doubt to be able to get it lase at 220VAC single phase @ 38A max...

I keep thinking about getting it to work before selling it though, and I really want to see it lase even if it is at one watt... a whitelight tube is something I want to make work one day, and I have now that opportunity, having one for free