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Related Experiment Video

Updated: Jul 13, 2026

The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements

The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements

Published on: December 5, 2025

Real-time phase-front detector for heterodyne interferometers.

Felipe Guzmán Cervantes¹, Gerhard Heinzel, Antonio F García Marín

¹Max-Planck-Institut für Gravitationsphysik, Albert-Einstein-Institut Hannover, Germany. felipe.guzman@aei.mpg.de

|July 5, 2007

Summary

We developed a new real-time differential phase-front detector for heterodyne interferometers. This instrument achieves 500 pm precision, aiding in the manufacture of the Laser Interferometer Space Antenna Technology Package interferometer and other optical metrology applications.

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Area of Science:

Optics and Metrology
Interferometry
Instrumentation

Background:

Precise measurement of optical phase fronts is critical for advanced scientific instruments.
Heterodyne interferometry is a key technique for high-precision measurements.
The Laser Interferometer Space Antenna Technology Package (LISA) requires highly accurate phase-front detection.

Purpose of the Study:

To develop a real-time differential phase-front detector with high precision.
To support the manufacturing of the LISA flight model interferometer.
To provide a versatile instrument for general optical metrology.

Main Methods:

Implementation of a real-time differential phase-front detection system.
Utilizing heterodyne interferometry with frequencies up to 10 kHz.
Spatially resolving the measurement of the interferometer's phase front.

Main Results:

Achieved sensitivity better than 3 mrad root mean square (rms).
Demonstrated a precision of approximately 500 picometers (pm).
Successfully performed spatially resolving measurements of phase fronts.

Conclusions:

The developed detector meets the stringent requirements for LISA.
The instrument offers significant advantages for optical metrology.
This technology advances the capabilities of phase-front measurement.