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Proceedings Paper

Chalcogenide fibers for improved reliability of active infrared sensing systems (Conference Presentation)
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Paper Abstract

Defense sensing systems must be both productive and robust to accomplish their mission. Active infrared sensing devices consist of many components such as the active medium, mirrors, beam-splitters, modulators, gratings, detectors, etc. Each of these components is subject to damage by the laser beam itself or environmental factors. Misalignment of these components due to vibration and temperatures changes can also reduce performance. The result is a complex and expensive system subject to multiple points of degradation or complete failure. However, beam confinement or “no free-space optics” via fiber transmission and even component assembly within the fiber itself can achieve reliability and low cost for sensing systems with reduced component count and less susceptibility to misalignment. We present measurements of high-power infrared laser beam transmission in chalcogenide fibers. The fiber compositions were As39S61 for the core and As38.5S61:5 for the cladding, resulting in a numerical aperture of 0.2. A polyetherimide jacket provided structural support. Multiwatt CW transmission was demonstrated in near single-mode 12 micron core fiber. Efficient coupling of quantum cascade lasing into anti-reflection coated chalcogenide fiber was also demonstrated. Efficient beam transport without damage to the fiber required careful coupling only into core modes. Beams with M2 ≥ 1.4 and powers higher than 1 W produced damage at the fiber entrance face. This was most likely due to heating of the highly absorptive polymer jacket by power not coupled into core modes. We will discuss current power limitations of chalcogenide fiber and schemes for significantly increasing power handling capabilities.

Paper Details

Date Published: 14 May 2018
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Proc. SPIE 10637, Laser Technology for Defense and Security XIV, 106370T (14 May 2018); doi: 10.1117/12.2305229
Show Author Affiliations
Justin Cook, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)
Alex Sincore, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)
Felix Tan, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)
Ahmed El Halawany, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)
Anthony Riggins, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)
Lawrence Shah, Luminar Technologies, Inc. (United States)
CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)
Ayman F. Abouraddy, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)
Martin Richardson, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)
Kenneth L. Schepler, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)


Published in SPIE Proceedings Vol. 10637:
Laser Technology for Defense and Security XIV
Mark Dubinskiy; Timothy C. Newell, Editor(s)

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