Abstract
Optical and electronic signal-processing schemes for the measurement of circular birefringence using monomode fibre optic techniques are described. Optical mixing of two orthogonal circularly polarized states is utilized to produce a linear state, the azimuth of which is controlled electronically to produce pseudo-heterodyne phase-modulated carriers. The signal-processing techniques are shown to be applicable to the recovery of circular birefringence in the presence of environmental perturbations and over a wide time-scale—from ws to ks. Methods to obtain phase measurement stabilities of -0·05° are presented and the system is demonstrated in a ‘time-varying’ optical-activity measurement.
Published Version
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