 Metal Can Motor Capacitors for pumping SS Laser flashlamp?
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MikeT1982
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Fri Jul 18 2008, 09:07PM
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Registered Member #621
Joined: Sun Apr 01 2007, 12:37AM
Location:
Posts: 119
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Would those metal motor run/start can style capacitors found on ebay be suitable for pumping a flashlamp in a SSY-1 laser? I found some on ebay that are around 400 VAC and 70 MFD each. If I paralleled 3 of them and charged them to about 400 volts I think I'd get about 10-15 joules for the lamp.
I guess my main other questions are -
- Are those "faster" dumping then the electrolytics I'm using for my Ruby project (which is ok to be slow)?
- How high DC can I charge them to if rated say 400VAC....and they are non-polar I'd assume since AC?
Thanks for any input!!
Mike
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Mates
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Registered Member #1025
Joined: Sun Sept 23 2007, 07:53PM
Location: Czech Rep.
Posts: 566
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PP motor foil caps are the best for Xenon flash lamps (personal experience). They have minimum resitance and can stand anything (no heating). With the same used capacitance you get much stronger flashes compared to elyts. The only disadvantage is the size.
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Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
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You should be fine with a motor start cap, my big versapulse yag (20w output power of Ho:YAG probably as much pump power as a 50WNd:YAG) used a bog ole metal cases oil cap.
But for ssy-1 work normal electrolytics seem to work just fine as well, you will loose a little efficiency with the esr from the caps and less than ldel waveforms, but the laser should lase just great. Just be careful to remove the q-switch if you want to use >20j input energies.
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