Nonlinear correction of a laser scanning interference system based on a fiber ring resonator

Area of Science:

• Optics and Photonics
• Metrology
• Optical Engineering

Background:

• Laser scanning interferometry (LSI) offers efficient measurement capabilities across various fields.
• A key limitation of LSI is performance degradation caused by laser tuning nonlinearity.
• Addressing this nonlinearity is crucial for advancing LSI applications.

Purpose of the Study:

• To develop a method for correcting laser tuning nonlinearity in LSI systems.
• To improve the accuracy and reliability of LSI measurements.
• To enhance the practical applicability of LSI technology.

Main Methods:

• Utilized a fiber ring resonator as an external clock signal source.
• Employed equifrequency sampling to resample the main interference signal.
• Implemented a technique to correct for laser tuning nonlinearity.

Main Results:

• Successfully achieved equifrequency sampling of the laser scanning interference system.
• Demonstrated effective correction of laser tuning nonlinearity.
• Significantly reduced phase noise attributed to tuning nonlinearity.

Conclusions:

• The proposed method effectively mitigates phase noise in LSI systems.
• This technique enhances the overall performance and accuracy of laser scanning interferometry.
• The fiber ring resonator-based approach offers a viable solution for practical LSI applications.