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 Fri Nov 14 19:20:42 2008, Yoichi, Update, PSL, Reference cavity ring down 
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 Fri Nov 14 20:35:47 2008, rana, Update, PSL, Reference cavity ring down
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Fri Nov 14 22:40:51 2008, Yoichi, Update, PSL, Reference cavity ring down
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Mon Nov 17 15:07:06 2008, Yoichi, Update, PSL, Reference cavity ring down
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Message ID: 1138
Entry time: Fri Nov 14 22:40:51 2008
In reply to: 1137
Reply to this: 1140
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| Author: |
Yoichi |
| Type: |
Update |
| Category: |
PSL |
| Subject: |
Reference cavity ring down |
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| Quote: |
To make the DEI pulser make a fast pulse on the EO shutter EOMs, we had to make sure:
1) the cable had a high voltage rated dielectric. cheap dielectrics show the 'corona'
effect, especially when there is a bend in the cable.
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I'll check it with Bob.
| Quote: |
2) the EO has to have a resistor on it to prevent ringing due to the impedance mismatch.
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Did you use a shunt or series resistor ?
If shunt, I guess it has to have a huge heat sink.
Actually, DEI says the pulser does not require any external shunt/series resistors or impedance-matching network.
Looks like it is not true ...
| Quote: |
3) We needed ~3.5 kV to get the EO shutter crystal to flip the light by 90 deg.
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Yes, I adjusted the voltage to maximize the power change and it was about 3.5kV. |