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Entry  Wed Jul 2 19:15:52 2008, Alberto, Update, General, Status of the alignment of the NPRO beam for the Absolute Length Measurement DSC_0156.JPGDSC_0158.JPG
    Reply  Thu Jul 3 11:53:30 2008, Koji, Update, General, Status of the alignment of the NPRO beam for the Absolute Length Measurement 
Message ID: 628     Entry time: Thu Jul 3 11:53:30 2008     In reply to: 627
Author: Koji 
Type: Update 
Category: General 
Subject: Status of the alignment of the NPRO beam for the Absolute Length Measurement 
The method itself looked fine.

Use of the one arm configuration will make the work easier as constant power at the AS port is obtained.
How much is the FSR of the OSA?

Apparently the alignment is not good any more as Alberto pointed. Everytime you touch the flipper you'd better to adjust it. Then, if necessary, adjust the injection steerings.

If the PSL beam is blocked, only the injection beam appears at the optical ports. The spot is obtained at the AS port and the SY port (REFL) at the same time. I recommend to confirm the transmittion to the SY port too by the CDD, the card, and whatever. Note that this may be difficult because this will have the beam power of below 1 mW.


Quote:
Alberto> Today I've tried to bring the frequency of the NPRO laser ...
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