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IR Spectrometers

IR Spectrometers

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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Updated: May 2, 2026

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing

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Published on: December 3, 2013

Mid-infrared difference-frequency generation in suspended GaAs waveguides.

Todd H Stievater, Rita Mahon, Doewon Park

|February 25, 2014

Summary

We demonstrated mid-infrared difference-frequency generation in suspended GaAs waveguides. This method utilizes form-birefringent phase-matching for efficient nonlinear mixing, generating idler wavelengths between 2800-3150 nm.

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Last Updated: May 2, 2026

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing

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Published on: December 3, 2013

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

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Published on: March 22, 2019

Implementation of a Reference Interferometer for Nanodetection

Implementation of a Reference Interferometer for Nanodetection

Published on: April 26, 2014

Area of Science:

Photonics and Nonlinear Optics
Materials Science

Background:

Mid-infrared (mid-IR) light generation is crucial for spectroscopy and sensing.
Integrated photonic devices offer miniaturization and enhanced performance for nonlinear optical processes.

Purpose of the Study:

To experimentally demonstrate mid-infrared difference-frequency generation (DFG) in suspended GaAs waveguides.
To achieve efficient nonlinear mixing using form-birefringent phase-matching in ultrahigh index-contrast waveguides.

Main Methods:

Fabrication of suspended 181 nm thick GaAs waveguides.
Utilizing form-birefringent phase-matching for nonlinear optical interactions.
Employing continuous-wave (CW) signal and pump lasers for DFG.

Main Results:

Successful generation of idler wavelengths in the mid-IR range (2800–3150 nm).
Achieved a measured nonlinear mixing efficiency of 0.4 W⁻¹.
Demonstrated DFG in a 1.2 mm long waveguide with low-power CW lasers.

Conclusions:

Suspended GaAs waveguides enable efficient mid-IR DFG via form-birefringent phase-matching.
This approach is promising for compact and efficient mid-IR light sources.