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Related Experiment Video

Updated: Jul 2, 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

Laser frequency combs for astronomical observations.

Tilo Steinmetz¹, Tobias Wilken, Constanza Araujo-Hauck

¹Max-Planck Institut für Quantenoptik, Hans-Kopfermann-Strasse 1, D-85748 Garching, Germany.

Science (New York, N.Y.)

|September 6, 2008

Summary

This summary is machine-generated.

Astronomical spectrographs can now achieve unprecedented Doppler precision using laser frequency comb calibration. This breakthrough enables direct measurement of the universe's expansion history and acceleration.

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Area of Science:

Astronomy
Astrophysics
Optical Engineering

Background:

Directly measuring the universe's expansion history requires observing redshift evolution.
Current astronomical spectrographs lack the necessary precision for Doppler velocity drift measurements (approx. 1 cm/s/yr).

Purpose of the Study:

To demonstrate the first use of a laser frequency comb for astronomical telescope wavelength calibration.
To assess the achievable Doppler precision with this novel calibration technique.

Main Methods:

Utilized a laser frequency comb for high-precision wavelength calibration of an astronomical telescope.
Analyzed spectrograph and detector system data to identify and track systematic effects.

Main Results:

Achieved absolute calibration with an equivalent Doppler precision of approximately 9 m/s at 1.5 micrometers.
Demonstrated the advantage of laser frequency comb calibration in tracking complex, time-varying systematic effects.

Conclusions:

Laser frequency comb calibration significantly surpasses the accuracy of current state-of-the-art methods.
This technique provides a viable pathway for modeling and removing systematic errors for future cosmological experiments aiming to detect cosmic acceleration.