Sheila, Camilla WP# 12716
We followed the setup in 80451 and additionally I plugged BNC's inside SQZT7 to directly connect t-ed off OPO_IR_PD and OPO_TRANS PDs to the table feed-through, as OPO REFL "test in" and "test out", see photo. This let us do all the work in laser safe and have been left plugged in.
We started in the second leftmost spot from the right (85589, 85488, 85297), had been there since late June but the spot degraded quickly and the green power used to achieve 80uW from OPO was now ~30mW which is close to the max available.
We first checked where we were by going to the left edge of the crystal and then returned to the leftmost spot.
Once there we measured NLG, moved the crystal in steps on 100 counts, re-optimized OPO temperature and measured NLG, similar to 85589. Once we got to a NLG above 15 with 80uW of OPO TRANS, we stopped. The required green power used to achieve 80uW was now halved from 30mW to 15mW, much better. We started witht the OPO temps et to 31.2deg and ended at 32.3deg, this is closer to where we were operating 3 years ago, photo.
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Crystal Move
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OPO Setpoint
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Temp
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Amplified Max
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UnAmp
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Dark
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NLG
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| Starting | 31.202 | starting spot photo | |||||
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45x50 to left, 4x10 to left
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45uW
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0.0266166
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0.007152
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-3.7e-5
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3.7
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41x50 to left
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29x50 to right, 12 x 10m to right
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80uW
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31.1435
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0.058468
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8.13
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leftmost spot photo | ||
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10 to left
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same
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Unsure we were moving here,
later plugged OPO PZT scanning back in to watch.
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30 to left
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same
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50 to left
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same
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100 to left
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31.2256
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0.0606349
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8.4
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photo |
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100 to left
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31.306
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0.06549
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9.1
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100 to left
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31.404
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0.070145
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9.75
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100 to left
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0.074379
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10.3
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100 to left
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31.6236
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0.0788554
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11.0
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100 to left
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31.730
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0.0802738
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11.2
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100 to left
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31.8546
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0.0947171
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13.2
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100 to left
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31.9676
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0.10171
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14.1
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100 to left
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32.352
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0.112529
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0.007088
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-2.2e-5
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15.8
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Leaving here |
