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Proceedings Paper

Hollow core fiber optics for mid-wave and long-wave infrared spectroscopy
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Paper Abstract

We describe the development and testing of hollow core glass waveguides (i.e., fiber optics) for use in Mid-Wave Infrared (MWIR) and Long-Wave Infrared (LWIR) spectroscopy systems. Spectroscopy measurements in these wavelength regions (i.e., from 3 to 14 μm) are useful for detecting trace chemical compounds for a variety of security and defense related applications, and fiber optics are a key enabling technology needed to improve the utility and effectiveness of detection and calibration systems. Hollow glass fibers have the advantage over solid-core fibers (e.g., chalcogenide) in that they are less fragile, do not produce cladding modes, do not require angle cleaving or antireflection coatings to minimize laser feedback effects, and effectively transmit deeper into the infrared. This paper focuses on recent developments in hollow fiber technology geared specifically for infrared spectroscopy, including single mode beam delivery with relatively low bending loss. Results are presented from tests conducted using both Quantum Cascade Lasers (QCL) and CO2 lasers operating in the LWIR wavelength regime. Single-mode waveguides are shown to effectively deliver beams with relatively low loss (~ 1 dB/m) and relatively high beam quality. The fibers are also shown to effectively mode-filter the "raw" multi-mode output from a QCL, in effect damping out the higher order modes to produce a circularly symmetric Gaussian-like beam profile.

Paper Details

Date Published: 4 June 2011
PDF: 10 pages
Proc. SPIE 8018, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XII, 80180V (4 June 2011); doi: 10.1117/12.882840
Show Author Affiliations
Jason M. Kriesel, Opto Knowledge Systems, Inc. (United States)
Nahum Gat, Opto Knowledge Systems, Inc. (United States)
Bruce E. Bernacki, Pacific Northwest National Lab. (United States)
Rebecca L. Erikson, Pacific Northwest National Lab. (United States)
Bret D. Cannon, Pacific Northwest National Lab. (United States)
Tanya L. Myers, Pacific Northwest National Lab. (United States)
Carlos M. Bledt, Rutgers, The State Univ. of New Jersey (United States)
James A. Harrington, Rutgers, The State Univ. of New Jersey (United States)


Published in SPIE Proceedings Vol. 8018:
Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XII
Augustus W. Fountain; Patrick J. Gardner, Editor(s)

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