Journal ArticleDOI
Stand-off detection of solid targets with diffuse reflection spectroscopy using a high-power mid-infrared supercontinuum source
Malay Kumar,Mohammed N. Islam,Fred L. Terry,Michael J. Freeman,Allan Chan,Manickam Neelakandan,Tariq Manzur +6 more
TLDR
In this article, the authors measured the diffuse reflection spectrum of solid samples such as explosives (TNT, RDX, PETN), fertilizers (ammonium nitrate, urea), and paints (automotive and military grade) at a stand-off distance of 5m using a mid-infrared supercontinuum light source with 3.9 W average output power.Abstract:
We measure the diffuse reflection spectrum of solid samples such as explosives (TNT, RDX, PETN), fertilizers (ammonium nitrate, urea), and paints (automotive and military grade) at a stand-off distance of 5 m using a mid-infrared supercontinuum light source with 3.9 W average output power. The output spectrum extends from 750–4300 nm, and it is generated by nonlinear spectral broadening in a 9 m long fluoride fiber pumped by high peak power pulses from a dual-stage erbium-ytterbium fiber amplifier operating at 1543 nm. The samples are distinguished using unique spectral signatures that are attributed to the molecular vibrations of the constituents. Signal-to-noise ratio (SNR) calculations demonstrate the feasibility of increasing the stand-off distance from 5 to ∼150 m, with a corresponding drop in SNR from 28 to 10 dB.read more
Citations
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Journal ArticleDOI
Infrared and Raman spectroscopy techniques applied to identification of explosives
TL;DR: In this paper, a review summarizes the recent trends and developments of infrared and Raman spectroscopy applied to the identification of explosives that have been published over the past decade focusing on the different fields where explosives were studied: homeland and international security, forensics, environmental, characterization of explosives, trace detection and fluorescence-free Raman analysis of explosives.
Journal ArticleDOI
Mid-Infrared Optical Frequency Combs based on Difference Frequency Generation for Molecular Spectroscopy
Flavio C. Cruz,Daniel L. Maser,Todd A. Johnson,Gabriel Ycas,A. Klose,Fabrizio R. Giorgetta,Ian Coddington,Scott A. Diddams +7 more
TL;DR: Potential for broadband, high-resolution molecular spectroscopy is demonstrated by absorption spectra and interferograms obtained by heterodyning two combs, and strong pump depletion and parametric gain are observed.
Journal ArticleDOI
Mid-infrared optical frequency combs based on difference frequency generation for molecular spectroscopy.
Flavio C. Cruz,Daniel L. Maser,Todd A. Johnson,Gabriel Ycas,A. Klose,Fabrizio R. Giorgetta,Ian Coddington,Scott A. Diddams +7 more
TL;DR: In this article, a 3-mm-long MgO:PPLN crystal was used to produce mid-infrared femtosecond optical frequency combs for broadband, high-resolution molecular spectroscopy.
Journal ArticleDOI
Vibrational spectroscopy: recent developments to revolutionize forensic science.
Journal ArticleDOI
Experimental demonstration of linearly polarized 2-10 μm supercontinuum generation in a chalcogenide rib waveguide.
Yi Yu,Xin Gai,Pan Ma,Khu Vu,Zhiyong Yang,Rongping Wang,Duk-Yong Choi,Steve Madden,Barry Luther-Davies +8 more
TL;DR: This Letter reports the production of a supercontinuum extending from ≈2 μm to >10μm generated using a chalcogenide buried rib waveguide pumped with 330 femtosecond pulses at 4.184 μm, which is, to the best of the authors' knowledge, the broadest mid-infraredsupercontinuum generated in any planar waveguide platform.
References
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TL;DR: SpeX as mentioned in this paper uses prism cross-dispersers and gratings to provide resolving powers up to R ∼ 2000 simultaneously across 0.8-2.4, 1.9-4.2, or 2.4-5.5 mm, with a 15 long slit.
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Diffuse reflectance measurements by infrared Fourier transform spectrometry
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High resolution derivative spectra in remote sensing
TL;DR: The use of derivative spectra is an established technique in analytical chemistry for the elimination of background signals and for resolving overlapping spectral features Application of this technique for tackling analogous problems such as interference from soil background reflectance in the remote sensing of vegetation or for resolving complex spectra of several target species within individual pixels in remote sensing is proposed as mentioned in this paper.
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Laser-induced breakdown spectroscopy for detection of explosives residues: a review of recent advances, challenges, and future prospects
TL;DR: This review discusses the application of laser-induced breakdown spectroscopy (LIBS) to the problem of explosive residue detection and demonstrates the tremendous potential of LIBS for real-time detection of explosives residues at standoff distances.