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Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing

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Published on: March 22, 2019

Single-frequency mid-infrared waveguide laser.

Philippe Guay, Jérôme Genest, Vincent Michaud-Belleau

|December 28, 2019

Summary

This summary is machine-generated.

A novel single-mode chip laser operating at 2860 nm was developed using a Littman-Metcalf configuration. This compact, high-coherence laser offers a narrow linewidth, paving the way for advanced spectroscopic applications.

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Area of Science:

Optics and Photonics
Laser Technology

Background:

Single-frequency lasers are crucial for high-resolution spectroscopy and sensing.
Chip-based lasers offer miniaturization advantages but often struggle with coherence and single-mode operation.

Purpose of the Study:

To demonstrate a compact, single-mode guided-wave chip laser operating at 2860 nm.
To achieve high side-mode suppression and investigate the laser's linewidth characteristics.

Main Methods:

Utilized a Littman-Metcalf external cavity configuration integrated onto a chip.
Employed a heterodyne technique to precisely measure the laser's linewidth and Lorentzian contribution.

Main Results:

Achieved single longitudinal mode operation at 2860 nm with a side-mode suppression ratio exceeding 33 dB.
Measured a 2 MHz linewidth (10 ms scale) limited by mechanical fluctuations.
Estimated the intrinsic Lorentzian linewidth contribution to be below 1 Hz.

Conclusions:

The demonstrated chip laser provides a compact and high-coherence source at 2860 nm.
The Littman-Metcalf configuration effectively enables single-frequency operation in a chip-scale device.
This technology holds promise for applications requiring precise wavelength control and high spectral purity.