1. Design a scanning Fabry-Perot interferometer instrument that can characterize the mode separation of the HeNe with wavelength 633nm, linewidth 1.5GHz and cavity length 150cm? a) What is the minimum FSR the etalon must have in terms of frequency? b) What should be the length of the etalon to resolve the longitudinal modes if the reflectivity of the mirrors is R 0.95? c) How far must I move the scanning mirror in the interferometer to resolve a wavelength difference of 0.0001nm?
1. Design a scanning Fabry-Perot interferometer instrument that can characterize the mode separation of the HeNe with wavelength 633nm, linewidth 1.5GHz and cavity length 150cm? a) What is the minimum FSR the etalon must have in terms of frequency? b) What should be the length of the etalon to resolve the longitudinal modes if the reflectivity of the mirrors is R 0.95? c) How far must I move the scanning mirror in the interferometer to resolve a wavelength difference of 0.0001nm?
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Transcribed Image Text:1. Design a scanning Fabry-Perot interferometer instrument that can characterize the mode
separation of the HeNe with wavelength 633nm, linewidth 1.5GHz and cavity length 150cm?
a) What is the minimum FSR the etalon must have in terms of frequency?
b) What should be the length of the etalon to resolve the longitudinal modes if the reflectivity of
the mirrors is R 0.95?
c) How far must I move the scanning mirror in the interferometer to resolve a wavelength
difference of 0.0001nm?
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