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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...

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Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

Published on: December 18, 2015

Heterodyne interferometry with a frequency-modulated laser diode.

J Chen, Y Ishii, K Murata

|June 5, 2010

Summary

This study introduces a digital phase measuring interferometer that uses a frequency-modulated laser diode. The novel system achieves high precision phase measurement with excellent repeatability, advancing optical metrology.

Area of Science:

Optical Metrology
Interferometry
Laser Physics

Background:

Traditional interferometers face limitations in phase measurement accuracy.
Digital phase measurement techniques are crucial for advanced optical applications.

Purpose of the Study:

To describe a digital phase measuring interferometer utilizing a frequency-modulated laser diode.
To demonstrate a novel integrated-bucket technique for phase detection.

Main Methods:

Employed a frequency-modulated laser diode with injection current modulation.
Utilized an unbalanced Twyman-Green interferometer configuration.
Integrated interference pattern intensity with a CCD array sensor at quarter-period intervals.

Main Results:

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Last Updated: Jun 12, 2026

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Successfully implemented a digital phase measurement system.
Achieved a root-mean-square (rms) repeatability of lambda/80.
Demonstrated the effectiveness of the integrated-bucket technique for phase calculation.

Conclusions:

The developed digital phase measuring interferometer offers high precision and repeatability.
The frequency-modulated laser diode and integrated-bucket technique provide a robust phase measurement solution.
This method advances the capabilities of optical metrology systems.