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Related Experiment Video

Updated: Jun 8, 2026

Bringing the Visible Universe into Focus with Robo-AO

Bringing the Visible Universe into Focus with Robo-AO

Published on: February 12, 2013

Visible wavelength astro-comb.

Andrew J Benedick¹, Guoqing Chang, Jonathan R Birge

¹Research Laboratory of Electronics, Massachusetts Institute of Technology, 77 Mass Ave, Cambridge, MA 02139, USA. andrew_b@mit.edu

|October 14, 2010

Summary

This summary is machine-generated.

We developed a tunable laser frequency comb near 420 nm for precise calibration. This system achieves sub-1m/s accuracy, ideal for exoplanet detection using astrophysical spectrographs.

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Area of Science:

Physics
Astronomy
Optical Engineering

Background:

Laser frequency combs are crucial for high-precision measurements.
Astrophysical spectrographs require accurate calibration for exoplanet detection.
Existing calibration methods face limitations in precision and tunability.

Purpose of the Study:

To demonstrate a novel tunable laser frequency comb operating near 420 nm.
To characterize the performance of this frequency comb system.
To assess its suitability for calibrating high-resolution astrophysical spectrographs.

Main Methods:

Development of a tunable laser frequency comb with specific mode spacing (20-50 GHz) and usable bandwidth (15 nm).
Characterization of the laser frequency comb using the TRES spectrograph at the Fred Lawrence Whipple Observatory.
Evaluation of the system's accuracy for spectrograph calibration.

Main Results:

Demonstration of a tunable laser frequency comb with ~20 nW output power per line near 420 nm.
Achieved characterization accuracy below 1 m/s.
Confirmed suitability for calibrating high-resolution astrophysical spectrographs.

Conclusions:

The developed tunable laser frequency comb is a viable tool for high-accuracy calibration.
This system advances capabilities for exoplanet studies and other astrophysical research.
The sub-1m/s accuracy meets the stringent requirements for next-generation spectrographs.