Sequential bidirectional differential interferometer.

Area of Science:

• Optics and Photonics
• Interferometry
• Materials Science

Background:

• Refractive index gradients are crucial in various optical phenomena and applications.
• Traditional interferometry methods may face limitations in determining gradient direction and sensitivity.

Purpose of the Study:

• To develop a new differential interferometer utilizing holographic optical elements.
• To enable the measurement of refractive index gradient fields in two orthogonal directions.
• To provide unambiguous determination of the gradient sign and adjustable sensitivity.

Main Methods:

• Development of a differential interferometer incorporating holographic optical elements.
• Sequential measurement of gradient fields in two orthogonal directions using a PLZT electrooptic modulator.
• Inclusion of a reference fringe pattern to unequivocally determine the gradient sign.

Main Results:

• Successful determination of refractive index gradient fields in two orthogonal directions.
• Unambiguous determination of the gradient sign was achieved.
• Demonstration of easily adjustable sensitivity by altering optical component position.

Conclusions:

• The developed holographic differential interferometer is effective for measuring refractive index gradients.
• The device offers unambiguous sign determination and adjustable sensitivity.
• This technology has potential applications in fields requiring precise optical measurements.