NAOJ GW Elog Logbook 3.2
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NaokiAritomi - 01:21, Tuesday 30 July 2019 (1523)
Squeezing and anti-squeezing with different green power
[Aritomi, Yuhang]
We measured squeezing and anti-squeezing with green power from 15 mW to 55 mW. Attached picture shows the result. Our case seems that loss is 25% and phase noise is 30 mrad. Note that this is not a fitting.
After this measurement, we checked visibility and found that visibility is 0.935 which means loss is 12.6%. (Note that when we calculated visibility, we didn't consider DC offset of PD. Visibility should be higher than this.) Then we aligned LO and BAB and visibility became 0.973 which means loss is 5.3%. However, squeeze level didn't increase.
| green power (mW) | MZ offset | OPO temperature (kOhm) | p pol PLL (MHz) |
| 15 | 4.01 | 7.16 | 192 |
| 20 | 4.1 | 7.16 | 177 |
| 25 | 4.19 | 7.17 | 177 |
| 30 | 4.29 | 7.18 | 180 |
| 35 | 4.38 | 7.175 | 162 |
| 40 | 4.5 | 7.175 | 150 |
| 45 | 4.58 | 7.18 | 147 |
| 50 | 4.68 | 7.19 | 150 |
| 55 | 4.78 | 7.195 | 150 |
| 60 | 4.88 | 7.195 | 144 |
| 65 | 4.98 | 7.2 | 141 |
Images attached to this report
