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IR Spectrometers

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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...

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

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

Published on: March 22, 2019

Widely tunable mid-infrared quantum cascade lasers using sampled grating reflectors.

Tobias S Mansuripur¹, Stefan Menzel, Romain Blanchard

¹Department of Physics, Harvard University, 17 Oxford Street, Cambridge, Massachusetts 02138, USA.

|November 29, 2012

Summary

We developed an electrically pulsed quantum cascade laser with tunable single modes. This laser achieves over 280 mW peak optical power across a 0.46 μm wavelength range.

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Area of Science:

Optoelectronics
Semiconductor Lasers

Background:

Quantum cascade lasers (QCLs) are crucial for mid-infrared applications.
Achieving tunable, high-power single-mode emission is a key challenge.

Purpose of the Study:

To demonstrate a novel three-section, electrically pulsed quantum cascade laser.
To achieve current-tunable single-mode operation over a broad spectral range.

Main Methods:

Fabrication of a three-section laser incorporating a Fabry-Pérot cavity and sampled grating distributed Bragg reflectors.
Electrical pulsing and current tuning for mode selection.

Main Results:

Demonstrated a quantum cascade laser with current-tunable emission across ten single modes.
Achieved a spectral span of 0.46 μm (8.32–8.78 μm).
Exceeded 280 mW peak optical output power for nine of the ten modes.

Conclusions:

The demonstrated device offers a promising platform for tunable, high-power mid-infrared laser sources.
The design enables precise control over emission wavelength and power.