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Reports until 09:38, Friday 17 June 2016
H1 PSL (PSL)
peter.king@LIGO.ORG - posted 09:38, Friday 17 June 2016 (27804)
Diagnostic breadboard scan for the front end laser
It should be noted that the power incident on the reflected photodiode (RPD) was ~8.4V and the
diagnostic breadboard would like to have a minimum of 9V.  So all scans involving the front end
laser will have a message concerning "low power" associated with them.

    The front end laser relative power noise looks good.  Better than the reference trace in
places, about the same in others.

    The frequency noise measurement does not look quite right below 20 Hz.  Or between 300
and 400 Hz.  This might be a consequence of not having enough power but I suspect not.  Noise
is higher than the reference trace for frequencies greater than 1 kHz.

    During the beam pointing measurement, the diagnostic breadboard pre-modecleaner dropped out of
lock for a split second or two.  Measurement does not appear to be affected though, and looks good.

    During the mode scan measurement, the error message concerning the gouy phase appeared.  Every
now and then the pre-alignment flickers from being on to off.

    The mode scan is higher than the reference traces for all peaks but reports the higher order
mode content to be 5.7%.

    Note that the alignment of the front end laser beam to the diagnostic breadboard is still a
work in progress.
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