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 Fri Jul 8 20:50:49 2011, sonali, Update, Green Locking, Power of the AUX laser increased. 
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 Thu Jul 14 02:32:11 2011, sonali, Update, Green Locking, Power of the AUX laser increased.
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Fri Jul 15 13:48:56 2011, sonali, Update, Green Locking, Power of the AUX laser increased.
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Message ID: 4973
Entry time: Fri Jul 15 13:48:56 2011
In reply to: 4965
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| Author: |
sonali |
| Type: |
Update |
| Category: |
Green Locking |
| Subject: |
Power of the AUX laser increased. |
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| Quote: |
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| Quote: |
The power of the beam which is being coupled into the optical fibre is measured to be between 159 mW to 164 mW (The power meter was showing fluctuating readings).
The power out of the beam coming out of the fibre far-end at the PSL table is measured to be 72 mW. Here, I have attached a picture of the beam paths of the ETMY table with the beams labelled with their respective powers.
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For the phase locking or beat note measuring we only need ~1 mW. Its a bad idea to send so much power into the fiber because of SBS and safety. The power should be lowered until the output at the PSL is < 2 mW. In terms of SNR, there's no advantage to use such high powers.
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Well,the plan is to put in a neutral density filter in the beam path before it enters the fibre. But before I could do that, I set up the camera on the PSL table to look at the fiber output . I will need it while I realign the beam after putting in the Neutral Density Filter. I have attached the ETMY layout with the Neutral Density filter in place herewith. |
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