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Related Experiment Video

Updated: Jul 7, 2026

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

Accurate wavelength meter for cw lasers.

J Ishikawa¹, N Ito, K Tanaka

¹National Research Laboratory of Metrology, 1-1-4 Umezono, Sakura-mura, Niiharigun, Ibaraki 305, Japan.

|March 1, 1986

Summary

A new vacuum-operated wavemeter uses fringe counting for precise laser wavelength measurements. Comparisons with iodine-stabilized He-Ne lasers show high accuracy, validating the advanced fringe fraction determination technique.

Area of Science:

Metrology and Scientific Instrumentation
Laser Physics and Spectroscopy

Background:

Accurate measurement of continuous-wave (cw) laser wavelengths is crucial for various scientific and industrial applications.
Existing wavelength measurement techniques may have limitations in precision and accuracy for demanding applications.
The development of advanced interferometric methods is key to achieving higher precision in wavelength determination.

Purpose of the Study:

To develop and validate an accurate wavelength meter for continuous-wave (cw) lasers.
To implement and test a novel multicoincidence fringe counting technique for enhanced fringe fraction determination.
To compare the performance of the developed wavemeter against established standards using iodine-stabilized He-Ne lasers.

Main Methods:

Construction of a Michelson-type fringe-counting two-beam interferometer.

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Operation of the interferometer in a vacuum environment to eliminate air refractive index effects.

Development and application of a multicoincidence fringe counting technique to determine fringe fractions with high resolution (1/500 of a fringe).

Main Results:

Successful development of a highly accurate wavelength meter for cw lasers.
Demonstrated fringe fraction determination with an uncertainty of 1/500 of a fringe.
Wavelength comparisons of 612- and 633-nm I2-stabilized He-Ne lasers showed excellent agreement with CIPM 1983 recommended values.

Conclusions:

The developed vacuum-operated wavemeter, utilizing multicoincidence fringe counting, achieves high accuracy in laser wavelength measurement.
The achieved discrepancy of less than 4 x 10(-10) and standard deviation of 4 x 10(-10) validate the precision of the instrument.
This technology provides a reliable tool for metrological applications requiring precise wavelength characterization of cw lasers.