title: Sequential bidirectional differential interferometer.
abstract: A new type of differential interferometer based on holographic optical elements is developed which allows a refractive index gradient field to be determined in two orthogonal directions obtained sequentially with a PLZT electrooptic modulator. The sign of the gradient is unequivocally determined by using a reference fringe pattern added to the interferogram. The sensitivity of the device is easily adjustable by changing the position of only one optical component.
authors.forename: F
authors.initials: F
authors.lastname: De Schryver
authors.forename: B
authors.initials: B
authors.lastname: Biran
authors.forename: F
authors.initials: F
authors.lastname: Dubois