Sequential bidirectional differential interferometer.
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.
De Schryver
F
F
Biran
B
B
Dubois
F
F