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High-Precision Alignment Method for Electro-Optic Modulators via Combined Twyman-Green and Conoscopic Interferometry.

Peng Zhang1, Qi Lu2

  • 1Beijing Institute of Tracking and Telecommunication Technology, Beijing 100094, China.

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|October 16, 2025
PubMed
Summary

This study introduces a novel method for precisely aligning electro-optic modulators (EOMs) using combined Twyman-Green and conoscopic interferometry, crucial for quantum communications and imaging.

Keywords:
Twyman-Green interferometryalignmentconoscopic interferometryelectro-optic modulators

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Area of Science:

  • Optics and Photonics
  • Materials Science

Background:

  • Electro-optic modulators (EOMs) are vital for advanced optical systems.
  • Precise alignment of EOMs is challenging with conventional methods.
  • Accurate optical axis, transmission axis, and azimuthal alignment are critical for performance.

Purpose of the Study:

  • To develop a high-precision alignment method for EOMs.
  • To overcome limitations of current alignment techniques.
  • To enable optimal performance in quantum communications and high-resolution imaging.

Main Methods:

  • Synergistic combination of Twyman-Green and conoscopic interferometry.
  • Twyman-Green system for optical axis alignment of electro-optic crystals.
  • Conoscopic interferometry for transmission axis and azimuthal alignment under varying voltage conditions.

Main Results:

  • Achieved exceptional alignment accuracy for EOM components.
  • Demonstrated root mean square errors below 0.2862 mrad for transmission axis alignment.
  • Validated azimuthal alignment with root mean square errors below 0.3229 mrad using Z-cut LiNbO3 modulator.

Conclusions:

  • The proposed method provides a robust solution for high-precision EOM alignment.
  • Successfully addressed simultaneous alignment challenges in critical optical systems.
  • Enhances performance in demanding applications like quantum communications and imaging.