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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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Fast Fourier Transform

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A Multimodal Wide-Field Fourier-Transform Raman Microscope

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Published on: December 30, 2025

Femtosecond diffracting Fourier-transform infrared interferometer.

M Joffre, A Bonvalet, A Migus

|October 31, 2009

Summary

This summary is machine-generated.

Researchers created a new Fourier-transform spectroscopy method using a visible interferometer to generate infrared pulses. This technique enables advanced infrared spectroscopy by isolating specific signals through diffracted wave properties.

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Area of Science:

Spectroscopy
Infrared Technology
Optics

Background:

Fourier-transform spectroscopy (FTS) is a powerful technique for spectral analysis.
Generating tunable and coherent infrared light sources remains a challenge for spectroscopy.
Existing methods often require complex setups or have limitations in spectral range.

Purpose of the Study:

To develop a novel scheme for Fourier-transform spectroscopy in the mid and far-infrared regions.
To utilize femtosecond pulse generation and manipulation for enhanced infrared spectroscopy.
To demonstrate a new method for isolating specific infrared signals.

Main Methods:

A visible or near-infrared interferometer generates a sequence of two femtosecond pulses.
These femtosecond pulses are used to generate a sequence of infrared pulses.
Geometrical properties of diffracted infrared waves are exploited to isolate the desired signal.

Main Results:

A new Fourier-transform spectroscopy scheme has been successfully developed.
The method was experimentally demonstrated in the mid-infrared spectral range.
Optical rectification of 15-fs near-infrared pulses was employed for the demonstration.

Conclusions:

The developed method offers a new approach to Fourier-transform spectroscopy in the mid and far-infrared.
The technique effectively generates and isolates infrared pulses using femtosecond laser technology.
This advancement has potential applications in various fields requiring infrared spectral analysis.