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Sun Jun 29 02:33:28 2008, Koji, Update, General, Abs. Len. Meas. ~ Optical setup (I)
Mon Jun 30 05:33:38 2008, Koji, Update, General, Abs. Len. Meas. ~ Optical setup (II)
Tue Jul 1 21:54:05 2008, Koji, Update, General, Re: Abs. Length Meas. setup
Wed Jul 2 15:14:42 2008, steve, Update, General, added beam traps
Tue Jul 1 21:54:05 2008
In reply to:
Re: Abs. Length Meas. setup
I tried to look for the beating in the signal from the PD but I couldn't find. I had the temperature of the laser initially set to 40deg and then slowly increased by one degree. The manual of the laser says the frequency should change by several GHz. The problem is then that our PD is limited to no more than 30Mhz.
Although the two beams seem to overlap quite well, we might still need a better matching of the injected beam.
o The position of the iris was adjusted so as not to disturub the beam for OMCR CCD.
o The RF spectrum analyzer was returned to the place of the network analyzer.
In the process of making this report, I noticed that one of the iris apertures is about disturbing the beam for OMCR CCD. I will check this before I go to Hanford. Also an RF spectrum analyzer is at the AP table. I try to return this near the PSL on Monday morning.