Ultrasensitive Phase Measurement System Achieves Sub-Nanometer Precision

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Researchers from the University of Valencia have developed a novel ultrasensitive phase measurement system based on time-holographic recording with a conventional Mach-Zehnder interferometer. This system, which operates near the intensity minimum at the dark output port, is capable of converting phase fluctuations in the milliradian range into rad-sized dark output phases with amplification factors exceeding 1,000. The adjustable imbalance between the interferometer arms controls this magnification, which is revealed by heterodyning the output with a frequency-shifted beam.

The system achieves phase sensitivities better than 1/3,000, enabling sub-nanometer precision for dimensional measurements. This versatile platform provides powerful tools for ultrasensitive phase measurements in a wide range of scientific and technological applications.

Key Takeaways:

  • The ultrasensitive phase measurement system is based on time-holographic recording with a conventional Mach-Zehnder interferometer.
  • The system operates near the intensity minimum at the dark output port, allowing for the conversion of phase fluctuations in the milliradian range into rad-sized dark output phases.
  • The adjustable imbalance between the interferometer arms controls the amplification factor, which can exceed 1,000.
  • The phase measurement system achieves sensitivities better than 1/3,000, enabling sub-nanometer precision for dimensional measurements.
  • The system provides a versatile platform for ultrasensitive phase measurements in a wide range of scientific and technological applications.
  • The researchers from the University of Valencia include Molina-Garcia Andreu, Esteban-Martin Adolfo, Picazo Bueno Jose Angel, Silva Fernando, de Valcarcel German J., and Garcia-Monreal Javier.

Statistics:

  • The system achieves phase sensitivities better than 1/3,000.
  • The amplification factor can exceed 1,000.
  • The heterodyning output with a frequency-shifted beam allows for the control of the amplification factor.
  • The system provides sub-nanometer precision for dimensional measurements.
  • The researchers used a conventional Mach-Zehnder interferometer in their experiment.

Sources:

  • Molina-Garcia Andreu et al. 1,000-fold amplification in time-holography phase metrology. EPJ Web of Conferences, 2025, 335():01002. (EPJ Web of Conferences - http://www.epj-conferences.org/).
  • NewsRx. Researchers from University of Valencia Describe Research in Physics (1,000-fold amplification in time-holography phase metrology). Physics Week. October 21, 2025; p 673.