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Related Experiment Video

Updated: Mar 18, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Coherent cavity-enhanced dual-comb spectroscopy.

Adam J Fleisher, David A Long, Zachary D Reed

|July 14, 2016

Summary

A novel dual-comb spectroscopy method uses phase modulators and step-recovery diodes for over two hours of averaging. This enables rapid, simultaneous monitoring of gases like CO2 and H2O, paving the way for distributed optical sensors.

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Area of Science:

Spectroscopy
Laser Physics
Optical Engineering

Background:

Dual-comb spectroscopy (DCS) offers rapid, high-resolution spectral acquisition without mechanical parts.
Traditional DCS often requires phase-locked lasers or complex signal processing, limiting integration times.
Achieving long coherent integration times is crucial for enhancing sensitivity in DCS.

Purpose of the Study:

To demonstrate an alternative DCS approach using phase modulator combs from a single laser.
To achieve extended coherent real-time averaging for improved spectral signal acquisition.
To enable sensitive, simultaneous gas monitoring with a robust and compact system.

Main Methods:

Generated dual optical frequency combs using phase modulators driven by step-recovery diodes.
Utilized a single continuous-wave laser source for comb generation.
Employed passive, low-phase-noise step-recovery diodes for efficient harmonic generation and cavity coupling.

Main Results:

Achieved > 2 hours of coherent real-time averaging.
Generated dual combs with > 250 teeth, 203 MHz spacing, spanning > 50 GHz in the near-infrared.
Demonstrated simultaneous monitoring of CO2, CO, HDO, and H2O at ambient levels with a 150 kHz acquisition rate.

Conclusions:

The novel DCS approach overcomes limitations of traditional methods regarding integration time.
The system is robust, compact, low-cost, and widely tunable, suitable for various applications.
This technology can enable a network of distributed multiplexed optical sensors for environmental monitoring.