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40m Log |
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Tue Jan 26 17:50:22 2016, gautam, Update, Green Locking, Lightwave frequency noise measurement
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Wed Jan 27 18:19:45 2016, gautam, Update, Green Locking, Lightwave frequency noise measurement
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Thu Jan 28 00:29:30 2016, gautam, Update, Green Locking, Lightwave frequency noise measurement 
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Mon Feb 1 18:11:25 2016, gautam, Update, Green Locking, Lightwave frequency noise measurement
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Fri Jan 29 14:43:47 2016, Steve, Update, Green Locking, Innolight laser is 10 years old
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Fri Jan 29 16:55:27 2016, rana, Update, Green Locking, Innolight laser is 10 years old
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Sat Jan 30 00:12:22 2016, gautam, Update, Green Locking, Innolight laser is 10 years old
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Sat Jan 30 09:56:24 2016, Koji, Update, Green Locking, Innolight laser is 10 years old
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Mon Feb 1 15:16:28 2016, gautam, Update, Green Locking, Innolight laser is 10 years old
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Mon Feb 1 15:43:18 2016, Koji, Update, Green Locking, Innolight laser is 10 years old
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Fri Feb 5 15:02:13 2016, gautam, Update, Green Locking, X-end NE cable
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Fri Feb 12 11:10:49 2016, Steve, Update, Green Locking, Innolight laser is 10 years old
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Mon Mar 21 14:29:32 2016, Steve, Update, Calibration-Repair, 1W Innolight laser repair diagnoses
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Thu Mar 24 07:56:09 2016, Steve, Update, Calibration-Repair, NO Noise Eater for 1W Innolight
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Mon Apr 11 17:03:41 2016, Steve, Update, Calibration-Repair, 1W Innolight repair completed
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Message ID: 11969
Entry time: Mon Feb 1 18:11:25 2016
In reply to: 11956
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Author: |
gautam |
Type: |
Update |
Category: |
Green Locking |
Subject: |
Lightwave frequency noise measurement |
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Before distrubing the beat setup with the spare Lightwave laser, I wanted to see if I could resolve the apparent difference in behaviour between the measured free running noise of the spare Lightwave laser and my earlier measurements with the existing X and Y end lasers above ~5kHz. So I redid the measurement, but this time, on Eric's suggestion, while taking spectra on the SR785, I was careful to maintain the same "CH1 input range" while measuring the control signal spectrum and the measurement noise spectra. The level used was -20dBvpk. I think the measured spectrum shape now makes sense - above ~4kHz, the SR560 noise means that the SNR is poor and so we can only trust the spectra up to this value (the spectra for the end lasers are from earlier measurements where I did not take care to keep the input range constant). Anyways, I think the conclusion is that the spare Lightwave seems to have a free-running frequency noise that is approximately a factor of 3 worse than the Lightwave laser at the Y-end, though this may be because I didn't take the measurement at the optimal operating conditions (diode current, power etc). But I guess this is tolerable and that we can go ahead with the planned swapping out of the existing Innolight at the X-end with this laser.
I will now move the Lightwave laser off the PSL table onto the SP table where I will do some beam characterization and see if I can come up with a satisfactory mode-matching solution for the swap. I've borrowed a beam profiler from the TCN lab for this purpose. |
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