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Message ID: 6253
Entry time: Fri Feb 3 20:19:38 2012
Reply to this: 6256
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| Author: |
rana |
| Type: |
Update |
| Category: |
SUS |
| Subject: |
Oplev QPD Sum Trends are suspicious |
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The attached trend shows a problem with the QPD sums.
Why are ETMX and ITMX so much lower than ETMY and ITMY? Are the laser's dying? Or is it the gain inside the QPD? Or the reflectivity of the coatings?
Steve - please check on Monday the laser powers and the ETM/ITM reflectivity for HeNe lasers. Maybe we have to increase the transimpedance gain in the heads. |
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