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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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Implementation of a Reference Interferometer for Nanodetection

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Published on: April 26, 2014

An angle-scanned cryogenic Fabry-Pérot interferometer for far-infrared astronomy.

Ian Veenendaal¹, David Naylor¹, Brad Gom¹

¹Department of Physics and Astronomy, University of Lethbridge, 4401 University Dr. W, Lethbridge, Alberta AB T1K 3M4, Canada.

The Review of Scientific Instruments

|September 3, 2020

Summary

We developed a novel tunable Fabry-Pérot interferometer (FPI) for space telescopes. This design simplifies cryomechanics by tuning wavelength with incident angle, enabling background-limited spectroscopy.

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Published on: April 26, 2014

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

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Author Spotlight: Fabrication of a Low-Cost, Fiber-Coupled, and Air-Spaced Fabry-Pérot Etalon

Author Spotlight: Fabrication of a Low-Cost, Fiber-Coupled, and Air-Spaced Fabry-Pérot Etalon

Published on: February 3, 2023

Area of Science:

Astrophysics
Optical Engineering
Spectroscopy

Background:

Far-infrared detectors in space telescopes are limited by photon noise.
High-resolution spectroscopy requires restricting the spectral bandpass.
Fabry-Pérot interferometers (FPIs) are used for high-resolution spectroscopy.

Purpose of the Study:

To present a novel FPI design for space-based spectroscopy.
To simplify the cryomechanical design, actuation, and metrology of tunable FPIs.
To demonstrate wavelength tuning by scanning the angle of incidence.

Main Methods:

Designed a novel FPI utilizing a high refractive index etalon.
Tuned the resonant wavelength by scanning the angle of incidence.
Simulated spectral response as a function of incident angle.

Main Results:

Successfully realized and tested the novel FPI instrument.
Observed spectral response agrees well with theoretical simulations.
The angle-tuning method simplifies instrument design and operation.

Conclusions:

The angle-tuned FPI offers a simplified and effective approach for background-limited, high-resolution spectroscopy.
This novel design is suitable for cryogenically cooled space telescopes.
Further development can enhance capabilities for astronomical observations.