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Kilohertz linewidth from frequency-stabilized mid-infrared quantum cascade lasers.

R M Williams, J F Kelly, J S Hartman

|December 15, 2007

Summary

Frequency stabilization of mid-infrared quantum cascade (QC) lasers to kilohertz levels was achieved using electronic servo techniques. This active feedback method successfully locked a QC distributed-feedback laser to a nitrous oxide resonance, significantly reducing frequency noise.

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Area of Science:

Physics
Spectroscopy
Laser Technology

Background:

Mid-infrared quantum cascade (QC) lasers are crucial for various spectroscopic applications.
Achieving high frequency stability in QC lasers is essential for precise measurements.
Previous methods for laser frequency stabilization had limitations in achieving kilohertz-level precision.

Purpose of the Study:

To demonstrate kilohertz-level frequency stabilization for mid-infrared QC lasers.
To lock a QC distributed-feedback laser to a specific molecular resonance for enhanced stability.
To characterize the frequency noise and linewidth of the stabilized laser.

Main Methods:

Utilized electronic servo techniques for active feedback control.
Locked an 8.5-microm quantum cascade distributed-feedback laser to a rovibrational resonance of nitrous oxide (N(2)O) at 1176.61 cm⁻¹.

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Measured the stabilized frequency-noise spectral density.

Main Results:

Achieved frequency stabilization of the QC laser to the kilohertz level.
Measured a stabilized frequency-noise spectral density of 42 Hz/√Hz at 100 kHz.
Calculated a laser linewidth of 12 kHz.

Conclusions:

Electronic servo techniques are effective for high-precision frequency stabilization of mid-IR QC lasers.
The stabilized laser system provides a stable frequency source for demanding spectroscopic applications.
The demonstrated stability opens possibilities for advanced measurements in chemical sensing and molecular spectroscopy.