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40m Log |
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Thu Mar 18 10:46:51 2010, Koji, Update, ABSL, PLL reconstructed
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Thu Mar 18 12:27:56 2010, Alberto, Update, ABSL, PLL reconstructed
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Thu Mar 18 13:40:35 2010, Koji, Update, ABSL, PLL reconstructed
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Thu Mar 18 21:42:26 2010, Koji, Update, ABSL, PLL reconstructed
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Mon Mar 22 22:11:26 2010, Mott, Update, ABSL, PLL reconstructed
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Mon Mar 22 23:37:32 2010, Mott, Update, ABSL, PLL reconstructed 
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Tue Mar 23 18:44:46 2010, Mott, Update, ABSL, PLL reconstructed
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Wed Mar 24 03:58:18 2010, kiwamu, matt, koji, Update, Green Locking, leave PLL locked
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Wed Mar 24 04:22:51 2010, kiwamu, matt, Update, Green Locking, two NPRO PLL
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Wed Mar 24 14:52:02 2010, Alberto, Update, Green Locking, two NPRO PLL
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Wed Mar 24 15:59:59 2010, kiwamu, matt, Update, Green Locking, leave PLL locked
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Thu Mar 25 17:29:48 2010, kiwamu, mott, Update, Green Locking, PLL two NPROs
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Message ID: 2697
Entry time: Mon Mar 22 23:37:32 2010
In reply to: 2696
Reply to this: 2703
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Author: |
Mott |
Type: |
Update |
Category: |
ABSL |
Subject: |
PLL reconstructed |
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We have managed to lock the PLL to reasonable stability. The RF input is attenuated by 26 dBm and the beat signal locks very close to the carrier of the marconi (the steps on the markers of the spectrum analyzer are coarse). We can use the marconi and the local boost of the pdh box to catch the lock at 0 gain. Once the lock is on, the gain can be increased to stabilize the lock. The locked signals are shown in the first photo (the yellow is the output of the mixer and the blue is the output to the fast input of the laser. If the gain is increased too high, the error signal enters an oscillatory regime, which probably indicates we are overloading the piezo. This is shown in the second photo, the gain is being increased in time and we enter the non-constant regime around mid-way through.
Tomorrow I will use this locked system to measure the PZT response (finally!). |
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