Sub-picometer resolution from a low-cost wavelength meter

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Sub-picometer resolution from a low-cost
wavelength meter
Adam Banfield, Sarah Anderson and Chad
Hoyt Bethel University, St. Paul, MN
How it works Because the beams travel identical
pathlengths the wavelengths are proportional
through the ratio of counted fringes, NR/NU
reference laser
retroreflector
LabView GPIB automated data acquisition