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Updated: Jul 16, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Frequency-comb-referenced quantum-cascade laser at 4.4 microm.

S Bartalini¹, P Cancio, G Giusfredi

¹CNR-Istituto Nazionale di Ottica Applicata, Firenze FI, Italy.

|March 22, 2007

Summary

This study presents the first absolute frequency measurement of a quantum-cascade laser (QCL) using an optical frequency comb synthesizer (OFCS). This breakthrough enables precise spectroscopic analysis of molecular transitions, advancing laser frequency metrology.

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Area of Science:

Quantum optics
Laser spectroscopy
Molecular physics

Background:

Precise frequency measurements are crucial for advancing spectroscopy and metrology.
Quantum-cascade lasers (QCLs) offer unique mid-infrared emission properties.
Optical frequency comb synthesizers (OFCS) provide highly accurate frequency references.

Purpose of the Study:

To report the first absolute frequency measurement of a QCL.
To establish a new method for precise laser frequency referencing.
To enable high-resolution spectroscopy of molecular transitions.

Main Methods:

Sum-frequency generation (SFG) of a 4.43 µm QCL with a Nd:YAG laser to produce 858 nm radiation.
Referencing both the QCL-derived and a diode laser to an optical frequency comb synthesizer (OFCS).

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Measuring the beat note between the two lasers for absolute frequency determination.

Main Results:

Successful absolute frequency measurement of the QCL at 858 nm.
Demonstration of the QCL as a viable source for frequency metrology.
Recording of Doppler-broadened line profiles of (13)CO(2) molecular transitions with high accuracy.

Conclusions:

The developed technique establishes a new benchmark for QCL frequency measurements.
This work paves the way for high-precision spectroscopy applications using QCLs.
The methodology is extendable to other laser sources and molecular targets.