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Related Experiment Video

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The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements

The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements

Published on: December 5, 2025

A precision reflectometer.

¹School of Physics, University of Melbourne,Parkville, Victoria 3052, Australia.

|January 14, 2010

Summary

This summary is machine-generated.

This study introduces a novel reflectometer for precise measurement of a reflecting surface's principal angle of incidence (theta) and principal azimuth (psi). The instrument achieves high accuracy for both parameters using modulated optical elements and specific measurement techniques.

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The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements

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The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

Published on: August 12, 2013

Area of Science:

Optical Physics
Surface Science
Metrology

Background:

Accurate characterization of reflecting surfaces is crucial in optics and material science.
Existing reflectometry methods may face limitations in precision or require complex calibration.

Purpose of the Study:

To develop and validate a reflectometer capable of precisely measuring the principal angle of incidence (theta) and principal azimuth (psi).
To demonstrate a measurement technique with high accuracy and minimal sensitivity to alignment errors and detector non-linearity.

Main Methods:

Angle of incidence (theta) determination via frequency modulation of polarizer and analyzer, detecting a null in the difference frequency component.
Principal azimuth (psi) measurement by adjusting polarizer and analyzer to maintain constant transmitted irradiance.
Utilizing mechanical oscillation of polarizing elements for modulation.

Main Results:

The reflectometer achieves a sensitivity better than 10 arcseconds for theta.
The principal azimuth (psi) is determined with an accuracy of 1 part in 1000 for tan(psi).
The method shows negligible impact from significant polarizer/analyzer misalignments (0.02 rad) and requires no corrections for source/detector polarization.

Conclusions:

The developed reflectometer offers a highly accurate and robust method for characterizing reflecting surfaces.
The techniques are adaptable for a broader range of wavelengths beyond visible light.
This instrument provides a valuable tool for optical metrology and surface analysis.