Optics: measuring and testing – Refraction testing
Patent
1991-06-21
1992-11-24
Evans, F. L.
Optics: measuring and testing
Refraction testing
G01N 2141
Patent
active
051667444
ABSTRACT:
In order to determine the nonlinear refractive index coefficient of a material which, once inserted into a Fabry-Perot cavity (1), has an optically bistable behavior, the output power (12; 13) of the cavity (1) is measured in function of the power (1) of an amplitude-modulated optical input signal to obtain the material hysteresis loop; the hysteresis loop saturation region is detected, where the phase (.phi.) of the electromagnetic field associated with the signal within the cavity is a linear function of the output power; the values of the phase (.phi.) in said region are obtained from the output and input power values (12; 13; 11) and the nonlinear refractive index coefficient (n2) is obtained from the angular coefficient of the straight line representing said phase.
REFERENCES:
patent: 5007735 (1991-04-01), Calvani et al.
Applied Optics 2219, vol. 25, No. 10 15 May 1986 S. D. Smith.
Electronics Letters 30 Aug. 1990, vol. 26, No. 18 Calvani et al.
D. Milam and M. J. Weber, "Measurement of nonlinear refractive index coefficient . . . ", Journal of Applied Physics, vol. 47, 1976, pp. 2497 through 2501.
Calvani Riccardo
Caponi Renato
CSELT - Centro Studi e Laboratori Telecomunicazioni S.P.A.
Dubno Herbert
Evans F. L.
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