Effects of gravity on processing heavy metal fluoride fibers

Tucker, Dennis S.; Workman, Gary L.; Smith, Guy A.

doi:10.1557/jmr.1997.0297

Cited by 26 publications

(10 citation statements)

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“…The total propagation losses can easily reach few dB/km for fluoride fibers, which suggests that the transparency spectrum of a waveguide might be very different from bulk it is made of. It is interesting to notice how the manufacturing of glasses and waveguides in micro-gravity can significantly improve the purity of the sample (e.g., see Tucker (1997) 10 for the case of heavy metal fluoride fibers). Minimizing the propagation losses does not only depend on the manufacturing process.…”

Section: Instrument Requirements For a Photonic-based Instrumental Dementioning

confidence: 99%

Astronomical photonics in the context of infrared interferometry and high-resolution spectroscopy

et al. 2016

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We review the potential of Astrophotonics, a relatively young field at the interface between photonics and astronomical instrumentation, for spectro-interferometry. We review some fundamental aspects of photonic science that drove the emergence of astrophotonics, and highlight the achievements in observational astrophysics. We analyze the prospects for further technological development also considering the potential synergies with other fields of physics (e.g. non-linear optics in condensed matter physics). We also stress the central role of fiber optics in routing and transporting light, delivering complex filters, or interfacing instruments and telescopes, more specifically in the context of a growing usage of adaptive optics.

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Section: Instrument Requirements For a Photonic-based Instrumental Dementioning

confidence: 99%

Astronomical photonics in the context of infrared interferometry and high-resolution spectroscopy

et al. 2016

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“…These fibers also show promise in applications such as nuclear radiation-resistant links, highcapacity multiplexed fiber optics systems, and nonlinear optical applications. 3,5 The main obstacle with ZBLAN glass is the extrinsic process, which includes the problem of crystallization. The optical transmission spectrum for a ZBLAN fiber is from 0.3 μm in the ultraviolet to 7 μm in the infrared region.…”

Section: Introductionmentioning

confidence: 99%

“…1,3,[5][6][7] Therefore, microgravity processing shows promise in the work toward broadening the working temperature range of ZBLAN. 1,3,[5][6][7] Therefore, microgravity processing shows promise in the work toward broadening the working temperature range of ZBLAN.…”

Section: Introductionmentioning

confidence: 99%

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Increasing the working temperature range of ZrF4-BaF2-LaF3-AlF3-NaF glass through microgravity processing

Torres

Ganley²,

Maji

et al. 2014

Opt. Eng

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Fluorozirconate glasses, such as ZBLAN (ZrF 4 -BaF 2 -LaF 3 -AlF 3 -NaF), have the potential for optical transmission from 0.3 μm in the ultraviolet to 7 μm in the infrared regions. However, crystallites formed during the fiber-drawing process prevent this glass from achieving its desired transmission range. The temperature at which the glass can be drawn into a fiber is known as the working range, defined as (Tx-Tg), bounded by the glass transition temperature (Tg) and the crystallization temperature (Tx). In contrast to silica glasses, the working temperature range for ZBLAN glass is extremely narrow. Multiple ZBLAN samples were subjected to a heating and quenching test apparatus on the parabolic aircraft under a controlled μ-g and hyper-g environments and compared with 1-g ground tests. Optical microscopy examination elucidates that crystal growth in ZBLAN is suppressed and initiates at a later temperature when processed in a microgravity environment. Thus, the crystallization temperature, Tx, at which the crystals form has increased. The glass transition temperature, Tg, remains constant, as crystallization does not occur until approximately 360°C for this composition of ZBLAN. Therefore, the working temperature range for ZBLAN has been broadened.

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“…The melting and solidification of glasses in low gravity is attracting the interest of more and more glass researcher and many results [1][2][3][4][5][6][7] were obtained indicating that a glass prepared from a melt in low gravity is more chemically homogeneous than an identical glass prepared in normal gravity. At the same time, the glass has smaller and fewer micro-heterogeneous regions and is more resistant to crystallization.…”

Section: Introductionmentioning

confidence: 99%