Optics: measuring and testing – For optical fiber or waveguide inspection
Patent
1984-11-08
1990-06-19
Rosenberger, Richard A.
Optics: measuring and testing
For optical fiber or waveguide inspection
356121, G01J 100
Patent
active
049348191
ABSTRACT:
The value of a transverse moment of any order of the electromagnetic field associated with an optical beam (and in particular the spot-size of such a beam) is determined by two successive measurements of the optical power of the beam: one measurement is a direct measurement, the other is effected after spatially modulating the transverse distribution of the electromagnetic field by a factor proportional to the n-th power of the transverse coordinate of the beam, n being the moment order. The moment can be obtained from the ratio between the two measurements. The invention includes also the apparatus for carrying out the method.
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Coppa Gianni
Di Vita Pietro
Rossi Umberto
CSELT - Centro Studi e Laboratori Telecomunicazioni S.P.A.
Dubno Herbert
Rosenberger Richard A.
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