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Registered Member #2941
Joined: Fri Jun 25 2010, 08:08AM
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Posts: 143
I get my new laser to work, using the fridge pump , for this I vaccum a wine bottle, I vaccum the laser cavity ,and while the pump is still runing I fix the wine bottle (not half full of amptyness) to the output of the pump, effectively making a double stage pump...
Registered Member #1667
Joined: Sat Aug 30 2008, 09:57PM
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Posts: 374
cedric wrote ...
I get my new laser to work, using the fridge pump , for this I vaccum a wine bottle, I vaccum the laser cavity ,and while the pump is still runing I fix the wine bottle (not half full of amptyness) to the output of the pump, effectively making a double stage pump...
That's a pretty neat trick. Have you tried using a larger gas cylinder? Apart from the larger volume, they don't have the habit of shattering while you're (not) looking.
Registered Member #2941
Joined: Fri Jun 25 2010, 08:08AM
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Posts: 143
hboy007 wrote ...
cedric wrote ...
I get my new laser to work, using the fridge pump , for this I vaccum a wine bottle, I vaccum the laser cavity ,and while the pump is still runing I fix the wine bottle (not half full of amptyness) to the output of the pump, effectively making a double stage pump...
That's a pretty neat trick. Have you tried using a larger gas cylinder? Apart from the larger volume, they don't have the habit of shattering while you're (not) looking.
I didn't have any thing like that around , but I put a piece of fabric around the bottle...
Registered Member #6075
Joined: Wed Aug 08 2012, 11:48PM
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Posts: 29
hboy007 wrote ...
radhoo wrote ...
So you're saying I can simply use one of these: and forget about the vacuum pump at all?
Well, see for yourself:
The higher the pressure, the narrower the pumping window, we're talking about ~1ns for nitrogen at atmospheric pressure. There exists a relation for the lifetime of the excited level as a function of the operating pressure: A peaking capacitor is introduced to compensate for the "slow" marx bank.
I'm trying to do this, unfortunately it's not at all clear how to calculate the value of the peaking capacitor. Some sources suggest it's a function of the Marx bank's inductance, but some of the LE Marx-powered nitrogen lasers use quite large peaking capacitors despite Marxes of fairly non-inductive appearance... and a bit of further research suggests getting the value of the peaking cap right is critical to minimizing risetime.
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longitudinal excitation nitrogen laser
