Hyperspectral imaging of gases with a continuous-wave pump-enhanced optical parametric oscillator

Stothard, David J. M.; Dunn, Malcolm H.; Rae, Cameron F.

doi:10.1364/opex.12.000947

Cited by 46 publications

(31 citation statements)

References 20 publications

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“…13 When the pump photon passes the non-linear crystal (fan grated, periodically poled lithium niobate, PPLN), where the parametric process takes place, its energy is converted into two lower energy photons called signal and idler. The summed energy of the signal and idler photons is equal to the energy of the pump photon.…”

Section: Hyperspectral Equipmentmentioning

confidence: 99%

Use of infrared hyperspectral imaging as an aid for paint identification

Polak

Kelman

Murray

et al. 2016

J. Spectral Imaging

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This version is available at https://strathprints.strath.ac.uk/58213/ Strathprints is designed to allow users to access the research output of the University of Strathclyde. Unless otherwise explicitly stated on the manuscript, Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Please check the manuscript for details of any other licences that may have been applied. You may not engage in further distribution of the material for any profitmaking activities or any commercial gain. You may freely distribute both the url (https://strathprints.strath.ac.uk/) and the content of this paper for research or private study, educational, or not-for-profit purposes without prior permission or charge.Any correspondence concerning this service should be sent to the Strathprints administrator: strathprints@strath.ac.ukThe Strathprints institutional repository (https://strathprints.strath.ac.uk) is a digital archive of University of Strathclyde research outputs. It has been developed to disseminate open access research outputs, expose data about those outputs, and enable the management and persistent access to Strathclyde's intellectual output. This licence permits you to use, share, copy and redistribute the paper in any medium or any format provided that a full citation to the original paper in this journal is given, the use is not for commercial purposes and the paper is not changed in any way. Art authentication is a complicated process that often requires the extensive study of high value objects. Although a series of nondestructive techniques is already available for art scientists, new techniques, extending current possibilities, are still required. In this paper, the use of a novel mid-infrared tunable imager is proposed as an active hyperspectral imaging system for art work analysis. JOURNAL OF SPECTRAL IMAGING JSIThe system provides access to a range of wavelengths in the electromagnetic spectrum (2500-3750 nm) which are otherwise dificult to access using conventional hyperspectral imaging (HSI) equipment. The use of such a tool could be beneicial if applied to the paint classiication problem and could help analysts map the diversity of pigments within a given painting. The performance of this tool is demonstrated and compared with a conventional, off-the-shelf HSI system operating in the near infrared spectral region (900-1700 nm).Various challenges associated with laser-based imaging are demonstrated and solutions to these challenges as well as the results of applying classiication algorithms to datasets captured using both HSI systems are presented. While the conventional HSI system provides data in which more pigments can be accurately classiied, the result of applying the proposed laser-based imaging system demonstrates the validity of this technique for application in art authentication tasks.

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Section: Hyperspectral Equipmentmentioning

confidence: 99%

Use of infrared hyperspectral imaging as an aid for paint identification

Polak

Kelman

Murray

et al. 2016

J. Spectral Imaging

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“…A special aspect of the reported method is that it is all optical and performs an upconversion of a full 2-dimensional image. This is in contrast to the more conventional method based on upconverting one point at a time in combination with a x,y-scanning device [10], thus gaining in simplicity and speed.…”

Section: Introductionmentioning

confidence: 98%

Enhanced 2D-image upconversion using solid-state lasers

Pedersen¹,

Karamehmedović²,

Dam³

et al. 2009

Opt. Express

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Based on enhanced upconversion, we demonstrate a highly efficient method for converting a full image from one part of the electromagnetic spectrum into a new desired wavelength region. By illuminating a metal transmission mask with a 765 nm Gaussian beam to create an image and subsequently focusing the image inside a nonlinear PPKTP crystal located in the high intra-cavity field of a 1342 nm solid-state Nd:YVO 4 laser, an upconverted image at 488 nm is generated. We have experimentally achieved an upconversion efficiency of 40% under CW conditions. The proposed technique can be further adapted for high efficiency mid-infrared image upconversion where direct and fast detection is difficult or impossible to perform with existing detector technologies.

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“…Recently, stand-off spectroscopy using wavelength-tunable mid-IR lasers (e.g. quantum cascade lasers or narrow-linewidth OPOs) has been shown to provide sensitive detection of solid or gas samples at medium or long distances [13][14][15][16][17], however combining broad spectral coverage with rapid tuning still remains challenging. In this paper, we present the first implementation, to our knowledge, of active stand-off FTIR spectroscopy using a femtosecond OPO.…”

Section: Introductionmentioning

confidence: 99%

Active FTIR-based standoff detection in the 3-4 micron region using broadband femtosecond optical parametric oscillators

2014

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We present the first demonstration of stand-off Fourier transform infrared spectroscopy using a broadband mid-infrared femtosecond optical parametric oscillator, with spectral coverage over 2700-3200 cm -1 . Remote spectroscopy and chemical detection from 2700-3100 cm -1 is demonstrated for a thiodiglycol drop on concrete and anodized aluminum surfaces at a stand-off distance of 2 meters, as well as open-path spectroscopy of atmospheric water vapor from a concrete target at the same range. Comparison of the measured stand-off spectra with archived reference spectra for thiodiglycol and water vapor show good agreement. This technique provides greater spatial coherence and spectral brightness than a thermal source, and wider spectral coverage than a typical quantum-cascade laser, thereby presenting opportunities for application in the detection of industrial pollutants and the environmental identification of chemical warfare agents, explosives or other hazardous materials.

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Hyperspectral imaging of gases with a continuous-wave pump-enhanced optical parametric oscillator

Cited by 46 publications

References 20 publications

Use of infrared hyperspectral imaging as an aid for paint identification

Use of infrared hyperspectral imaging as an aid for paint identification

Enhanced 2D-image upconversion using solid-state lasers

Active FTIR-based standoff detection in the 3-4 micron region using broadband femtosecond optical parametric oscillators

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