An orthogonal return method for linearly polarized beam based on the Faraday effect and its application in...

Area of Science:

• Optics
• Metrology
• Physics

Background:

• Accurate laser interferometry relies on the precise return of the measuring beam.
• Object rotation and lateral displacement degrade measurement accuracy or cause failure.

Purpose of the Study:

• To develop a novel method for orthogonal beam return in laser interferometers.
• To address challenges posed by object movement in interferometric measurements.

Main Methods:

• Utilized the Faraday effect with a 45° Faraday rotator for orthogonal beam return.
• Designed and analyzed a specific optical configuration.
• Constructed a laser heterodyne interferometer incorporating the new method.

Main Results:

• Successfully demonstrated orthogonal return of a linearly polarized beam.
• Verified the method's effectiveness in a laser heterodyne interferometer.
• Achieved reliable interferometric measurements despite significant lateral displacement and angular rotation.

Conclusions:

• The proposed Faraday effect-based method ensures correct measuring beam return.
• This technique maintains interferometric measurement integrity under challenging object movements.
• Enhances the robustness and applicability of laser interferometry.