[asac][almanews] ALMA Memo 482 Released

[Stacy Oliver]

ALMA MEMO #482 

An Analysis on the Affect of Dual Wavelength Polarization Alignment on
the Accuracy of Recovered Beat Note Phase 

R.Scott 
National Radio Astronomy Observatory

2004-01-21

LO Reference Line Length Correction Status Report
(BEND-50.03.10.00-003-A-REP) included an analysis of the phase and
amplitude due to the beating of two elliptically polarized light beams.
In this report, the problem will be re-examined and analyzed in a more
generalized way. The result will be used to investigate the sensitivity
of the phase of the beat note response to mismatches of the polarization
states of the two incident light beams. The results will show accurate
beat note phase can be recovered when the polarization states of the two
light beams satisfy a specific mathematical relation between the
polarization states at the point the two light beams are combined onto a
single fiber. For systems with potentially depolarizing components, the
condition is more stringent; the polarization states of the two light
beams must be exactly matched when the two light beams are combined. 

View a pdf version of ALMA Memo #482. 
http://www.alma.nrao.edu/memos/html-memos/alma482/memo482.pdf

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