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Narrow-linewidth quantum cascade laser at 8.6 μm.

Eugenio Fasci, Nicola Coluccelli, Marco Cassinerio

|August 15, 2014

Summary

We developed a narrow-linewidth quantum cascade laser (QCL) with exceptional spectral purity. This laser, locked to an optical cavity, achieves a linewidth under 4 kHz and minimal frequency noise for advanced applications.

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Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

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Published on: December 18, 2015

Area of Science:

Quantum optics
Laser physics
Spectroscopy

Background:

Quantum cascade lasers (QCLs) are crucial for mid-infrared applications.
Achieving narrow linewidths and high spectral purity in QCLs remains a challenge.
Optical cavities enhance laser performance but require precise locking mechanisms.

Purpose of the Study:

To demonstrate a narrow-linewidth distributed-feedback quantum cascade laser (QCL) at 8.6 μm.
To achieve optical-feedback locking of the QCL to a high-finesse V-shaped cavity.
To comprehensively characterize the spectral purity and frequency noise of the locked QCL.

Main Methods:

Utilized a distributed-feedback quantum cascade laser operating at 8.6 μm.
Implemented an optical-feedback locking scheme to a high-finesse V-shaped cavity.
Employed a high-sensitivity optical frequency discriminator for spectral purity characterization.

Main Results:

Achieved a 1 ms linewidth of less than 4 kHz for the locked QCL.
Measured a minimum laser frequency noise spectral density of 0.01 Hz²/Hz for Fourier frequencies > 100 kHz.
Demonstrated cumulative standard deviation of laser intensity better than 0.1% over a 2 Hz to 100 MHz bandwidth.

Conclusions:

The optical-feedback locking technique significantly enhances the spectral purity of the 8.6 μm QCL.
The characterized low frequency noise and narrow linewidth are suitable for high-precision spectroscopic measurements.
The demonstrated intensity stability further broadens the potential applications in demanding optical systems.