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Entry  Tue Apr 24 22:07:10 2012, tara, Notes, Laser, borrow NPRO from TNI IMG_0818.jpg
    Reply  Wed Apr 25 10:13:55 2012, Frank, Notes, Laser, borrow NPRO from TNI 
       Reply  Wed Apr 25 15:15:03 2012, tara, Notes, Laser, borrow NPRO from TNI 
Message ID: 936     Entry time: Wed Apr 25 10:13:55 2012     In reply to: 934     Reply to this: 939
Author: Frank 
Type: Notes 
Category: Laser 
Subject: borrow NPRO from TNI 

Don't forget to write an SOP for that laser before using it. A few things changed recently if you want to use the old SOP as an template. The hazard zone and emergency laser shutdown procedures, table layout etc. have slightly changed since the 10W laser has been moved. The map outside the lab is also not up-to-date anymore. The main kill switch at the door is still active but the second one which was attached to the 10W laser is gone now, but also not required for the NPRO. The required OD for safety glasses has to be recalculated for the document, but the ones we have are all good. The rest of the old SOP should be the same.

You also have to redo the mode matching to the PMC as the beam waist changes if you switch to the higher power laser.

For a two-laser setup we don't have all the parts at the moment to do so. There is no EOM for the PMC nor the refcav sidebands, no servo for the PMC, and no PMC. We don't have all parts to build a new PMC, especially no PZTs. Mirrors exist, spacer parts too but have to be assembled and we have to ask P.K. if we can have them, but shouldn't be a problem.


I borrow an NPRO from TNI. The model is similar to what we have, but I think the maximum power is 500mW (what we have is 100mW). I'll check the beam waist position tomorrow.

     Since we might switch to 2-laser setup, it is a good idea to have the second one ready. I checked a few companies for 1064 laser diode, but I could not find the information about how to control the frequency and its performance on the webpages. So I asked Eric Black and got the laser from TNI. Plus, the TTFSS is proved to be sufficient to suppress NPRO free running noise below coating noise level, the NPRO laser should be good for our setup.  We might need to think about preparing the rest of the equipments (resonant EOM for 2nd PMC, resonant and Broadband for refcav, PMC, and the servo circuits). For now, if the borrowed laser works fine and has more power, we might just switch it with the current one to gain more power.




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