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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: Jul 3, 2025

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

Ultra-phase-stable infrared light source at the watt level.

Simon Reiger, Mikhail Mamaikin, Dmitrii Kormin

|February 15, 2024

Summary

This summary is machine-generated.

Researchers developed a novel infrared laser source for studying light-matter interactions. This new system offers high power and exceptional waveform stability without complex stabilization, enabling advanced applications.

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Last Updated: Jul 3, 2025

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Published on: January 28, 2019

Area of Science:

Laser Physics and Photonics
Ultrafast Optics
Nonlinear Optics

Background:

Ultrashort infrared pulses are crucial for light-matter interaction studies.
Traditional methods like multi-stage parametric amplification struggle with waveform stability.
Active stabilization systems add complexity to high-energy infrared pulse generation.

Purpose of the Study:

To develop a stable, high-power infrared laser source at 1.8 µm.
To overcome the limitations of existing methods for generating ultrashort infrared pulses.
To enable advanced applications such as sub-cycle pulse synthesis.

Main Methods:

Utilized Ytterbium-doped Yttrium Aluminum Garnet (Yb:YAG) thin-disk laser technology at 1.03 µm.
Employed a hybrid two-stage spectral broadening scheme.
Implemented intra-pulse difference frequency generation within a single nonlinear crystal.

Main Results:

Generated infrared pulses centered at 1.8 µm with watt-level average power.
Achieved passive carrier-envelope phase stability below 20 mrad.
Demonstrated a broad tunability of the central wavelength.
Generated a multi-octave continuum spanning from 500 nm to 2.5 µm.

Conclusions:

The developed single-crystal nonlinear approach offers a simpler, more stable alternative for high-power infrared pulse generation.
The system's passive stability and tunability are comparable to advanced oscillators.
This laser source paves the way for sub-cycle pulse synthesis with unprecedented waveform stability.