| Reduced Fresnel Losses in Chalcogenide Fibers by Using Anti-Reflective Surface Structures on Fiber End Faces |
06 Dec 2010 |
10 pages |
| Authors:
Jasbinder Sanghera; Catalin Florea; Lynda Busse; Brandon Shaw; Fritz Miklos; Ishwar Aggarwal; NAVAL RESEARCH LAB WASHINGTON DC
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 | We demonstrate microstructuring of chalcogenide fiber end faces in order to obtain enhanced transmission due to the antireflective properties of the microstructured surfaces. A variety of molding approaches have been investigated for As2S3 and As2Se3 fibers. Transmission as high as 97% per facet was obtained in the case of As2S3 fiber, compared to the native, Fresnel-loss limited, transmission of 83%. The potential for hydrophobic character was also demonstrated by increasing ... |
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| Spinel as Exit Aperture Window for HEL Systems |
17-Nov-2008 |
30 pages |
| Authors:
Ishwar Aggarwal; Shyam Bayya; Guillermo Villaiobos; Woohong Kim; Jasbinder Sanghera; David Reicher; Stan Peplinski; Al Ogolza; NAVAL AIR WARFARE CENTER CHINA LAKE CA RESEARCH DEPT
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| Spinel is an excellent candidate for HEL windows. Significantly better than glass materials: 3x stronger and harder, 10x higher thermal conductivity, significantly better thermal shock resistance, OPD is comparable to OFG and better Silica, significantly superior environmental ruggedness. Successfully developed rugged, low-loss AR coatings for Spinel. Demonstrated fabrication of a large Spinel window. Availability of high optical quality AR coated Spinel windows will have a significant impact on all DoD ... |
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| Amplification by Means of Dysprosium Doped Low Phonon Energy Glass Waveguides |
26 OCT 1999 |
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| Authors:
Jasbinder Sanghera; Brandon Shaw; Brian Cole; Barry Harbison; Ishwar D. Aggarwal; DEPARTMENT OF THE NAVY WASHINGTON DC
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 | Disclosed herein is an amplification method, an optical glass amplifier, a laser based on the amplifier and an amplification optical communication system, all based on a limited length of a single-mode glass fiber made from glass having phonon energy of less than about 350/cm and doped with dysprosium. The glass includes 0.1-30 mol % germanium, 0-40 mol % arsenic, 0.02-20 mol % X. 0.01-20 mol % Y, and 0.001-2 weight ... |
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| Multi-Cylinder Apparatus for Making Optical Fibers, Process and Product |
04 MAY 1999 |
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| Authors:
Reza Mossadegh; Jasbinder Sanghera; Ishwar Aggarwal; DEPARTMENT OF THE NAVY WASHINGTON DC
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| A vertically disposed apparatus used to make core-clad optical fibers includes an inner elongated cylinder removably closed at the top and provided at the bottom with an inner exit port of a smaller diameter than the inner cylinder and an outer cylinder, disposed around the inner cylinder removably closed at the top and provided at the bottom with an outer exit port of a smaller diameter than the outer cylinder. ... |
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| Method for Producing Core/Clad Glass Optical Fiber Preforms Using Hot Isostatic Pressing |
07 APR 1998 |
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| Authors:
Jasbinder Sanghera; Pablo Pureza; Ishwar Aggarwal; Robert Miklos; DEPARTMENT OF THE NAVY WASHINGTON DC
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| Core/clad glass optical fiber preforms free of bubbles and soot at the core/clad interface are fabricated by inserting a glass core rod into a cladding glass tube sized so that space remains between them, sealing the top and bottom of the tube onto the core rod to form a seated space between them which is relatively soot free and under a vacuum and then hot isostatically pressing the seated composite ... |
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| Low Phonon Energy Glass and Fiber Doped with a Rare Earth |
29 AUG 1997 |
15 pages |
| Authors:
Brian Cole; Jasbinder Sanghera; Brandon Shaw; Barry Harbison; Ishwar Aggarwal; DEPARTMENT OF THE NAVY WASHINGTON DC
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| Disclosed herein is a low phonon energy glass and a fiber made therefrom. The glass includes the following components given in mol percent: X-germanium 0.1-30; arsenic 0-40; gallium; 0.01-20; and Y 40-85, wherein X is selected from the group consisting of germanium and mixtures of germanium and up to 50% of sulfur; wherein Y is selected from the group consisting of selenium; indium and mixtures thereof; and the glass also ... |
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| Process for Making Optical Fibers from Core and Cladding Glass Rods. |
12 AUG 1996 |
26 pages |
| Authors:
Jasbinder Sanghera; Pablo Pureza; Ishwar Aggarwal; Reza Mossadegh; DEPARTMENT OF THE NAVY WASHINGTON DC
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| A core/clad glass optical fiber is made by melting a core glass rod and a cladding glass rod in separate crucibles which are not concentric with respect to each other and the respective core and cladding glass melts passed out of contact with each other to a glass melt contacting zone proximate a fiber drawing orifice in which the cladding glass surrounds the core glass and a core/clad glass fiber ... |
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