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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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Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

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Published on: December 18, 2015

Cross-dispersion spectrograph calibration using only a laser frequency comb.

William Newman, Jake M Charsley, Jamie Slattery

|November 14, 2024

Summary

This summary is machine-generated.

A novel laser frequency comb technique calibrates high-resolution echelle spectrographs. This method precisely tags spectral lines, improving accuracy and eliminating the need for traditional calibration lamps and atlases.

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Area of Science:

Spectroscopy
Optical Engineering
Metrology

Background:

High-resolution spectrographs require complex calibration.
Conventional methods use broadband lamps and emission-line atlases.
These methods can be labor-intensive and less precise.

Purpose of the Study:

To introduce a new, simplified calibration technique for high-resolution echelle spectrographs.
To achieve sub-femtometer wavelength accuracy.
To enable GPS-referenced calibration without traditional methods.

Main Methods:

Utilizing a laser frequency comb (LFC) for calibration.
Removing specific LFC lines to identify spectral positions.
Reducing the LFC to single lines per order to determine spectrograph parameters.

Main Results:

Complete calibration of a high-resolution echelle spectrograph using only an LFC.
Sub-femtometer wavelength accuracy achieved.
Elimination of the need for broadband atomic-line sources.

Conclusions:

The LFC-based calibration is a robust and highly accurate method.
This technique simplifies spectrograph calibration.
It offers direct GPS-referenced accuracy, enhancing metrological applications.